Clarithromycin (clarithromycin 500 mg) Dailymed

Generic: clarithromycin is used for the treatment of Arrhythmias, Cardiac Bronchitis Chlamydia Infections Duodenal Ulcer Endocarditis, Bacterial Haemophilus Infections Kidney Diseases Liver Diseases Mycobacterium Infections, Nontuberculous Otitis Media Pneumonia, Mycoplasma Sinusitis Skin Diseases, Infectious Staphylococcal Infections Streptococcal Infections Tonsillitis Helicobacter Infections Porphyria, Acute Intermittent Jaundice, Obstructive

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Recent Major Changes

Warnings and Precautions, Acute Hypersensitivity Reactions (5.1) 6/2017

Warnings and Precautions, All-Cause Mortality in Patients With

Coronary Artery Disease Years After clarithromycin Exposure (5.5) 6/2017

1 Indications And Usage

Clarithromycin is a macrolide antimicrobial indicated for mild to moderate infections caused by designated, susceptible bacteria in the following:

Acute Bacterial Exacerbation of Chronic Bronchitis in Adults (1.1)

Acute Maxillary Sinusitis (1.2)

Community-Acquired Pneumonia (1.3)

Pharyngitis/Tonsillitis (1.4)

Uncomplicated Skin and Skin Structure Infections (1.5)

Acute Otitis Media in Pediatric Patients (1.6)

Treatment and Prophylaxis of Disseminated Mycobacterial Infections (1.7)

Helicobacter pylori Infection and Duodenal Ulcer Disease in Adults (1.8)

To reduce the development of drug-resistant bacteria and maintain the effectiveness of clarithromycin and other antibacterial drugs, clarithromycin should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. (1.9)

1.1 Acute Bacterial Exacerbation of Chronic Bronchitis
Clarithromycin tablets, USP are indicated in adults for the treatment of mild to moderate infections caused by susceptible isolates due to Haemophilus influenzae, Haemophilus parainfluenzae, Moraxella catarrhalis, or Streptococcus pneumoniae [see Indications and Usage (1.9)].

1.2 Acute Maxillary Sinusitis
Clarithromycin tablets, USP (in adults) are indicated for the treatment of mild to moderate infections caused by susceptible isolates due to Haemophilus influenzae, Moraxella catarrhalis, or Streptococcus pneumoniae [see Indications and Usage (1.9)].

1.3 Community-Acquired Pneumonia
Clarithromycin tablets, USP are indicated [see Indications and Usage (1.9)] for the treatment of mild to moderate infections caused by susceptible isolates due to:

Haemophilus influenzae (in adults)

Haemophilus parainfluenzae (in adults)

Moraxella catarrhalis (in adults)

Mycoplasma pneumoniae , Streptococcus pneumoniae , Chlamydophila pneumoniae (in adults and pediatric patients)

1.4 Pharyngitis/Tonsillitis
Clarithromycin tablets, USP are indicated for the treatment of mild to moderate infections caused by susceptible isolates due to Streptococcus pyogenes as an alternative in individuals who cannot use first line therapy.

1.5 Uncomplicated Skin and Skin Structure Infections
Clarithromycin tablets, USP are indicated for the treatment of mild to moderate infections caused by susceptible isolates due to Staphylococcus aureus, or Streptococcus pyogenes.

1.6 Acute Otitis Media
Clarithromycin tablets, USP are indicated in pediatric patients for the treatment of mild to moderate infections caused by susceptible isolates due to Haemophilus influenzae, Moraxella catarrhalis, or Streptococcus pneumoniae [see Clinical Studies (14.2)].

1.7 Treatment and Prophylaxis of Disseminated Mycobacterial Infections
Clarithromycin tablets, USP are indicated for the treatment of mild to moderate infections caused by susceptible isolates due to Mycobacterium avium or Mycobacterium intracellulare in patients with advanced HIV infection [see Clinical Studies (14.1)].

1.8 Helicobacter pylori Infection and Duodenal Ulcer Disease
Clarithromycin tablets, USP is given in combination with other drugs in adults as described below to eradicate H. pylori. The eradication of H. pylori has been demonstrated to reduce the risk of duodenal ulcer recurrence [see Clinical Studies (14.3)].

Clarithromycin tablets, USP in combination with amoxicillin and PREVACID (lansoprazole) or PRILOSEC (omeprazole) Delayed-Release Capsules, as triple therapy, are indicated for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or five-year history of duodenal ulcer) to eradicate H. pylori .

Clarithromycin tablets, USP in combination with PRILOSEC (omeprazole) capsules are indicated for the treatment of patients with an active duodenal ulcer associated with H. pylori infection. Regimens which contain clarithromycin tablets, USP as the single antibacterial agent are more likely to be associated with the development of clarithromycin resistance among patients who fail therapy. Clarithromycin-containing regimens should not be used in patients with known or suspected clarithromycin resistant isolates because the efficacy of treatment is reduced in this setting.

1.9 Limitations of Use
There is resistance to macrolides in certain bacterial infections caused by Streptococcus pneumoniae and Staphylococcus aureus. Susceptibility testing should be performed when clinically indicated.

1.10 Usage
To reduce the development of drug-resistant bacteria and maintain the effectiveness of clarithromycin and other antibacterial drugs, clarithromycin should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

2 Dosage And Administration

Adults: clarithromycin 250 mg or 500 mg every 12 hours for 7 to 14 days (2.2)

H. pylori eradication (in combination with lansoprazole/amoxicillin, omeprazole/amoxicillin, or omeprazole): Clarithromycin 500 mg every 8 or 12 hours for 10 to 14 days. See full prescribing information (FPI) for additional information. (2.3)

Pediatric Patients: Clarithromycin 15 mg/kg/day divided every 12 hours for 10 days (2.4)

Mycobacterial Infections: Clarithromycin 500 mg every 12 hours; clarithromycin 7.5 mg/kg up to 500 mg every 12 hours in pediatric patients (2.5)

Reduce dose in moderate renal impairment with concomitant atazanavir or ritonavir-containing regimens and in severe renal impairment (2.6)

2.1 Important Administration Instructions
Clarithromycin tablets may be given with or without food.

2.2 Adult Dosage
The recommended dosages of clarithromycin tablets for the treatment of mild to moderate infections in adults are uled in Table 1.

Table 1. Adult Dosage Guidelines

Clarithromycin Tablets

Infection Dosage (every 12 hours) Duration (days)

Acute bacterial exacerbation of chronic bronchitis 250 to 500 mg^a 7^b to 14

Acute maxillary sinusitis 500 mg 14

Community-acquired pneumonia 250 mg 7^d to 14

Pharyngitis/Tonsillitis 250 mg 10

Uncomplicated skin and skin structure infections 250 mg 7 to 14

Treatment and prophylaxis of disseminated Mycobacterium avium disease [see Dosage and Administration (2.5)] 500 mg^e -

H.pylori eradication to reduce the risk of duodenal ulcer recurrence with amoxicillin and omeprazole or lansoprazole [see Dosage and Administration (2.3)] 500 mg 10 to 14

H.pylori eradication to reduce the risk of duodenal ulcer recurrence with omeprazole [see Dosage and Administration (2.3)] 500 mg every 8 hours 14

^a For M. catarrhalis and S. pneumoniae use 250 mg. For H. influenzae and H. parainfluenzae , use 500 mg. ^b For H. parainfluenzae , the duration of therapy is 7 days. ^d For H. influenzae , the duration of therapy is 7 days. ^e Clarithromycin therapy should continue if clinical response is observed. Clarithromycin can be discontinued when the patient is considered at low risk of disseminated infection.

2.3 Combination Dosing Regimens for H. pylori Infection

Triple therapy: Clarithromycin tablets/lansoprazole/amoxicillin

The recommended adult dosage is 500 mg clarithromycin tablets, 30 mg lansoprazole, and 1 gram amoxicillin, all given every 12 hours for 10 or 14 days [see Indications and Usage (1.8) and Clinical Studies (14.3)].

Triple therapy: Clarithromycin tablets/omeprazole/amoxicillin

The recommended adult dosage is 500 mg clarithromycin tablets, 20 mg omeprazole, and 1 gram amoxicillin; all given every 12 hours for 10 days. In patients with an ulcer present at the time of initiation of therapy, an additional 18 days of omeprazole 20 mg once daily is recommended for ulcer healing and symptom relief [see Indications and Usage (1.8) and Clinical Studies (14.3)].

Dual therapy: Clarithromycin tablets/omeprazole

The recommended adult dosage is 500 mg clarithromycin tablets given every 8 hours and 40 mg omeprazole given once every morning for 14 days. An additional 14 days of omeprazole 20 mg once daily is recommended for ulcer healing and symptom relief [see Indications and Usage (1.8) and Clinical Studies (14.3)].

2.4 Pediatric Dosage
The recommended daily dosage is 15 mg/kg/day divided every 12 hours for 10 days (up to the adult dose). Refer to dosage regimens for mycobacterial infections in pediatric patients for additional dosage information [see Dosage and Administration (2.5)].

2.5 Dosage Regimens for Mycobacterial Infections
For the treatment of disseminated infection due to Mycobacterium avium complex (MAC), clarithromycin tablets are recommended as the primary agents. Clarithromycin tablets should be used in combination with other antimycobacterial drugs (e.g. ethambutol) that have shown in vitro activity against MAC or clinical benefit in MAC treatment [see Clinical Studies (14.1)].

Adult Patients

For treatment and prophylaxis of mycobacterial infections in adults, the recommended dose of clarithromycin tablets is 500 mg every 12 hours.

Pediatric Patients

For treatment and prophylaxis of mycobacterial infections in pediatric patients, the recommended dose is 7.5 mg/kg every 12 hours up to 500 mg every 12 hours. [See Use in Specific Populations (8.4) and Clinical Studies (14.1)].

Clarithromycin tablets therapy should continue if clinical response is observed. Clarithromycin tablets can be discontinued when the patient is considered at low risk of disseminated infection.

2.6 Dosage Adjustment in Patients with Renal Impairment
See Table 2 for dosage adjustment in patients with moderate or severe renal impairment with or without concomitant atazanavir or ritonavir-containing regimens [see Drug Interactions (7)].

Table 2. Clarithromycin Tablets Dosage Adjustments in Patients with Renal Impairment

Recommended Clarithromycin Tablets Dosage Reduction

Patients with severe renal impairment (CL_cr of <30 mL/min) Reduce the dosage of clarithromycin tablets by 50%

Patients with moderate renal impairment (CL_cr of 30 to 60 mL/min) taking concomitant atazanavir or ritonavir-containing regimens Reduce the dosage of clarithromycin tablets by 50%

Patients with severe renal impairment (CL_cr of <30 mL/min) taking concomitant atazanavir or ritonavir-containing regimens Reduce the dosage of clarithromycin tablets by 75%

2.7 Dosage Adjustment Due to Drug Interactions
Decrease the dose of clarithromycin tablets by 50 % when co-administered with atazanavir [see Drug Interactions (7)]. Dosage adjustments for other drugs when co-administered with clarithromycin tablets may be recommended due to drug interactions [see Drug Interactions (7)].

Table 1. Adult Dosage Guidelines
	Clarithromycin Tablets
Infection	Dosage (every 12 hours)	Duration (days)
Acute bacterial exacerbation of chronic bronchitis	250 to 500 mg^a	7^b to 14
Acute maxillary sinusitis	500 mg	14
Community-acquired pneumonia	250 mg	7^d to 14
Pharyngitis/Tonsillitis	250 mg	10
Uncomplicated skin and skin structure infections	250 mg	7 to 14
Treatment and prophylaxis of disseminated Mycobacterium avium disease [see Dosage and Administration (2.5)]	500 mg^e	-
H.pylori eradication to reduce the risk of duodenal ulcer recurrence with amoxicillin and omeprazole or lansoprazole [see Dosage and Administration (2.3)]	500 mg	10 to 14
H.pylori eradication to reduce the risk of duodenal ulcer recurrence with omeprazole [see Dosage and Administration (2.3)]	500 mg every 8 hours	14
^a For M. catarrhalis and S. pneumoniae use 250 mg. For H. influenzae and H. parainfluenzae , use 500 mg. ^b For H. parainfluenzae , the duration of therapy is 7 days. ^d For H. influenzae , the duration of therapy is 7 days. ^e Clarithromycin therapy should continue if clinical response is observed. Clarithromycin can be discontinued when the patient is considered at low risk of disseminated infection.

Table 2. Clarithromycin Tablets Dosage Adjustments in Patients with Renal Impairment
	Recommended Clarithromycin Tablets Dosage Reduction
Patients with severe renal impairment (CL_cr of <30 mL/min)	Reduce the dosage of clarithromycin tablets by 50%
Patients with moderate renal impairment (CL_cr of 30 to 60 mL/min) taking concomitant atazanavir or ritonavir-containing regimens	Reduce the dosage of clarithromycin tablets by 50%
Patients with severe renal impairment (CL_cr of <30 mL/min) taking concomitant atazanavir or ritonavir-containing regimens	Reduce the dosage of clarithromycin tablets by 75%

3 Dosage Forms And Strengths

Clarithromycin tablets, USP are available as:

Clarithromycin tablets, USP 250 mg are white oval film-coated tablets debossed with W954 on one side and other side plain.

Clarithromycin tablets, USP 500 mg are white oval film-coated tablets debossed with W949 on one side and other side plain.

Tablets: 250 mg and 500 mg (3)

4 Contraindications

Hypersensitivity to clarithromycin or any macrolide drug (4.1)

Cisapride, pimozide, lovastatin/simvastatin, ergotamine/dihydroergotamine (4.2,4.5, 4.6)

History of cholestatic jaundice/hepatic dysfunction with use of clarithromycin (4.3)

Colchicine in renal or hepatic impairment (4.4)

4.1 Hypersensitivity
Clarithromycin is contraindicated in patients with a known hypersensitivity to clarithromycin, erythromycin, or any of the macrolide antibacterial drugs [see Warnings and Precautions (5.1)].

4.2 Cardiac Arrhythmias
Concomitant administration of clarithromycin with cisapride and pimozide is contraindicated [see Drug Interactions (7)].

There have been postmarketing reports of drug interactions when clarithromycin is co-administered with cisapride or pimozide, resulting in cardiac arrhythmias (QT prolongation, ventricular tachycardia, ventricular fibrillation, and torsades de pointes) most likely due to inhibition of metabolism of these drugs by clarithromycin. Fatalities have been reported.

4.3 Cholestatic Jaundice/Hepatic Dysfunction
Clarithromycin is contraindicated in patients with a history of cholestatic jaundice or hepatic dysfunction associated with prior use of clarithromycin.

4.4 Colchicine
Concomitant administration of clarithromycin and colchicine is contraindicated in patients with renal or hepatic impairment.

4.5 HMG-CoA Reductase Inhibitors
Do not use clarithromycin concomitantly with HMG-CoA reductase inhibitors (statins) that are extensively metabolized by CYP3A4 (lovastatin or simvastatin), due to the increased risk of myopathy, including rhabdomyolysis [see Warnings and Precautions (5.4) and Drug Interactions (7)].

4.6 Ergot Alkaloids
Concomitant administration of clarithromycin and ergotamine or dihydroergotamine is contraindicated [see Drug Interactions (7)].

4.7 Contraindications for Co-administered Drugs
For information about contraindications of other drugs indicated in combination with clarithromycin, refer to their full prescribing information (contraindications section).

5 Warnings And Precautions

Severe acute hypersensitivity reactions: Discontinue clarithromycin if occurs (5.1)

QT prolongation: Avoid clarithromycin in patients with known QT prolongation or receiving drugs known to prolong the QT interval, ventricular arrhythmia (torsade de pointes), hypokalemia/hypomagnesemia, significant bradycardia, or taking Class IA or III antiarrhythmics (5.2)

Hepatotoxicity: Discontinue if signs and symptoms of hepatitis occur (5.3)

Serious adverse reactions can occur due to drug interactions of clarithromycin with colchicine, some HMG CoA reductase inhibitors, some calcium channel blockers, and other drugs (5.4)

Risk of all-cause mortality one year or more after the end of treatment in patients with coronary artery disease (5.5)

Clostridium difficile associated diarrhea (CDAD): Evaluate if diarrhea occurs (5.6)

Embryofetal toxicity: clarithromycin should not be used in pregnant women except in clinical circumstances where no alternative therapy is appropriate (5.7)

Exacerbation of myasthenia gravis (5.8)

5.1 Acute Hypersensitivity Reactions
In the event of severe acute hypersensitivity reactions, such as anaphylaxis, Stevens-Johnson Syndrome, toxic epidermal necrolysis, drug rash with eosinophilia and systemic symptoms (DRESS), Henoch-Schonlein purpura, and acute generalized exanthematous pustulosis, discontinue clarithromycin therapy immediately and institute appropriate treatment.

5.2 QT Prolongation
Clarithromycin has been associated with prolongation of the QT interval and infrequent cases of arrhythmia. Cases of torsades de pointes have been spontaneously reported during postmarketing surveillance in patients receiving clarithromycin. Fatalities have been reported.

Avoid clarithromycin in the following patients:

patients with known prolongation of the QT interval, ventricular cardiac arrhythmia, including torsades de pointes

patients receiving drugs known to prolong the QT interval [see also Contraindications (4.2)]

patients with ongoing proarrhythmic conditions such as uncorrected hypokalemia or hypomagnesemia, clinically significant bradycardia and in patients receiving Class IA (quinidine, procainamide) or Class III (dofetilide, amiodarone, sotalol) antiarrhythmic agents.

Elderly patients may be more susceptible to drug-associated effects on the QT interval [see Use in Specific Populations (8.5)].

5.3 Hepatotoxicity
Hepatic dysfunction, including increased liver enzymes, and hepatocellular and/or cholestatic hepatitis, with or without jaundice, has been reported with clarithromycin. This hepatic dysfunction may be severe and is usually reversible. In some instances, hepatic failure with fatal outcome has been reported and generally has been associated with serious underlying diseases and/or concomitant medications. Symptoms of hepatitis can include anorexia, jaundice, dark urine, pruritus, or tender abdomen. Discontinue clarithromycin immediately if signs and symptoms of hepatitis occur.

5.4 Serious Adverse Reactions Due to Concomitant Use with Other Drugs
Drugs metabolized by CYP3A4: Serious adverse reactions have been reported in patients taking clarithromycin concomitantly with CYP3A4 substrates. These include colchicine toxicity with colchicine; rhabdomyolysis with simvastatin, lovastatin, and atorvastatin; hypoglycemia with disopyramide; hypotension and acute kidney injury with calcium channel blockers metabolized by CYP3A4 (e.g., verapamil, amlodipine, diltiazem, nifedipine). Most reports of acute kidney injury with calcium channel blockers metabolized by CYP3A4 involved elderly patients 65 years of age or older. Use clarithromycin with caution when administered concurrently with medications that induce the cytochrome CYP3A4 enzyme. The use of clarithromycin with simvastatin, lovastatin, ergotamine, or dihydroergotamine is contraindicated [see Contraindications (4.5, 4.6) and Drug Interactions (7)].

Colchicine: Life-threatening and fatal drug interactions have been reported in patients treated with clarithromycin and colchicine. Clarithromycin is a strong CYP3A4 inhibitor and this interaction may occur while using both drugs at their recommended doses. If co-administration of clarithromycin and colchicine is necessary in patients with normal renal and hepatic function, reduce the dose of colchicine. Monitor patients for clinical symptoms of colchicine toxicity. Concomitant administration of clarithromycin and colchicine is contraindicated in patients with renal or hepatic impairment [see Contraindications (4.4) and Drug Interactions (7)].

HMG-CoA Reductase Inhibitors (statins): Concomitant use of clarithromycin with lovastatin or simvastatin is contraindicated [see Contraindications (4.5)] as these statins are extensively metabolized by CYP3A4, and concomitant treatment with clarithromycin increases their plasma concentration, which increases the risk of myopathy, including rhabdomyolysis. Cases of rhabdomyolysis have been reported in patients taking clarithromycin concomitantly with these statins. If treatment with clarithromycin cannot be avoided, therapy with lovastatin or simvastatin must be suspended during the course of treatment.

Exercise caution when prescribing clarithromycin with atorvastatin or pravastatin. In situations where the concomitant use of clarithromycin with atorvastatin or pravastatin cannot be avoided, atorvastatin dose should not exceed 20 mg daily and pravastatin dose should not exceed 40 mg daily. Use of a statin that is not dependent on CYP3A metabolism (e.g. fluvastatin) can be considered. It is recommended to prescribe the lowest registered dose if concomitant use cannot be avoided.

Oral Hypoglycemic Agents/Insulin: The concomitant use of clarithromycin and oral hypoglycemic agents and/or insulin can result in significant hypoglycemia. With certain hypoglycemic drugs such as nateglinide, pioglitazone, repaglinide and rosiglitazone, inhibition of CYP3A enzyme by clarithromycin may be involved and could cause hypoglycemia when used concomitantly. Careful monitoring of glucose is recommended [see Drug Interactions (7)].

Quetiapine: Use quetiapine and clarithromycin concomitantly with caution. Co-administration could result in increased quetiapine exposure and quetiapine related toxicities such as somnolence, orthostatic hypotension, altered state of consciousness, neuroleptic malignant syndrome, and QT prolongation. Refer to quetiapine prescribing information for recommendations on dose reduction if co-administered with CYP3A4 inhibitors such as clarithromycin [see Drug Interactions (7)].

Oral Anticoagulants: There is a risk of serious hemorrhage and significant elevations in INR and prothrombin time when clarithromycin is co-administered with warfarin. Monitor INR and prothrombin times frequently while patients are receiving clarithromycin and oral anticoagulants concurrently [see Drug Interactions (7)].

Benzodiazepines: Increased sedation and prolongation of sedation have been reported with concomitant administration of clarithromycin and triazolobenzodiazepines, such as triazolam and midazolam [see Drug Interactions (7)].

5.5 All-Cause Mortality in Patients With Coronary Artery Disease 1 to 10 Years After Clarithromycin Exposure
In one clinical trial evaluating treatment with clarithromycin on outcomes in patients with coronary artery disease, an increase in risk of all-cause mortality one year or more after the end of treatment was observed in patients randomized to receive clarithromycin.¹ Clarithromycin for treatment of coronary artery disease is not an approved indication. The cause of the increased risk has not been established. Other epidemiologic studies evaluating this risk have shown variable results [see Adverse Reactions (6.1)]. Consider balancing this potential risk with the treatment benefits when prescribing clarithromycin in patients who have suspected or confirmed coronary artery disease.

5.6 Clostridium difficile Associated Diarrhea
Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including clarithromycin, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.

C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibacterial use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antibacterial use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibacterial treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.

5.7 Embryofetal Toxicity
Clarithromycin should not be used in pregnant women except in clinical circumstances where no alternative therapy is appropriate. If clarithromycin is used during pregnancy, or if pregnancy occurs while the patient is taking this drug, the patient should be apprised of the potential hazard to the fetus. Clarithromycin has demonstrated adverse effects on pregnancy outcome and/or embryo-fetal development in monkeys, rats, mice, and rabbits at doses that produced plasma levels 2 times to 17 times the serum levels achieved in humans treated at the maximum recommended human doses [see Use in Specific Populations (8.1)].

5.8 Exacerbation of Myasthenia Gravis
Exacerbation of symptoms of myasthenia gravis and new onset of symptoms of myasthenic syndrome has been reported in patients receiving clarithromycin therapy.

5.9 Development of Drug Resistant Bacteria
Prescribing clarithromycin in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.

6 Adverse Reactions

The following serious adverse reactions are described below and elsewhere in the labeling:

Acute Hypersensitivity Reactions [see Warnings and Precautions (5.1)]

QT Prolongation [seeWarnings and Precautions (5.2)]

Hepatotoxicity [seeWarnings and Precautions (5.3)]

Serious Adverse Reactions Due to Concomitant Use with Other Drugs [see Warnings and Precautions (5.4)]

Clostridium difficile Associated Diarrhea [see Warnings and Precautions (5.6)]

Exacerbation of Myasthenia Gravis [see Warnings and Precautions (5.8)]

Most frequent adverse reactions for both adult and pediatric populations in clinical trials: abdominal pain, diarrhea, nausea, vomiting, dysgeusia (6.1)

To report SUSPECTED ADVERSE REACTIONS, contact Wockhardt USA LLC. at 1-800-346-6854 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

6.1 Clinical Trials Experience
Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in practice.

Based on pooled data across all indications, the most frequent adverse reactions for both adult and pediatric populations observed in clinical trials are abdominal pain, diarrhea, nausea, vomiting and dysgeusia. Also reported were dyspepsia, liver function test abnormal, anaphylactic reaction, candidiasis, headache, insomnia, and rash.

The subsequent subsections ul the most common adverse reactions for prophylaxis and treatment of mycobacterial infections and duodenal ulcer associated with H. pylori infection. In general, these profiles are consistent with the pooled data described above.

Prophylaxis of Mycobacterial Infections

In AIDS patients treated with clarithromycin over long periods of time for prophylaxis against M. avium, it was often difficult to distinguish adverse reactions possibly associated with clarithromycin administration from underlying HIV disease or intercurrent illness. Median duration of treatment was 10.6 months for the clarithromycin group and 8.2 months for the placebo group.

Table 4. Incidence Rates (%) of Selected Adverse Reactions^ain Immunocompromised Adult Patients Receiving Prophylaxis Against M. avium Complex

Body System^b Clarithromycin Tablets Placebo

Adverse Reaction (n=339) % (n=339) %

Body as a Whole

Abdominal pain 5% 4%

Headache 3% 1%

Digestive

Diarrhea 8% 4%

Dyspepsia 4% 3%

Flatulence 2% 1%

Nausea 11% 7%

Vomiting 6% 3%

Skin & Appendages

Rash 3% 4%

Special Senses

Taste Perversion 8%^c 0.3%

^a Includes those events possibly or probably related to study drug and excludes concurrent conditions ^b 2% or greater Adverse Reaction Incidence Rates for either treatment group ^c Significant higher incidence compared to the placebo-treated group

Discontinuation due to adverse reactions occurred in 18% of patients receiving clarithromycin compared to 17% of patients receiving placebo in this trial. Primary reasons for discontinuation in clarithromycin treated patients include headache, nausea, vomiting, depression, and taste perversion.

Changes in Laboratory Values

Selected laboratory adverse experiences that were reported during therapy in greater than 2 % of adult patients treated with clarithromycin in a randomized double-blind clinical trial involving 682 patients are presented in Table 5.

In immunocompromised patients receiving prophylaxis against M. avium, evaluations of laboratory values were made by analyzing those values outside the seriously abnormal value (i.e., the extreme high or low limit) for the specified test.

Table 5. Percentage of Patients^aExceeding Extreme Laboratory Values in Patients Receiving Prophylaxis Against M. avium Complex

Clarithromycin Tablets 500 mg twice a day Placebo

WBC Count <1 x 10⁹/L 2/103 (4%) 0/95

SGOT >5 x ULN^b 7/196 (4%) 5/208 (2%)

SGPT >5 x ULN^b 6/217 (3%) 4/232 (2%)

^a Includes only patients with baseline values within the normal range or borderline high (hematology variables) and within normal range or borderline low (chemistry variables) ^b ULN= Upper Limit of Normal

Treatment of Mycobacterial Infections

The adverse reaction profiles for both the 500 mg and 1000 mg twice a day dose regimens were similar.

In AIDS patients and other immunocompromised patients treated with the higher doses of clarithromycin over long periods of time for mycobacterial infections, it was often difficult to distinguish adverse reactions possibly associated with clarithromycin administration from underlying signs of HIV disease or intercurrent illness.

The following analysis summarizes experience during the first 12 weeks of therapy with clarithromycin. Data are reported separately for trial 1 (randomized, double-blind) and trial 2 (open-labeled, compassionate use) and also combined. Adverse reactions were reported less frequently in trial 2, which may be due in part to differences in monitoring between the two studies.

In adult patients receiving clarithromycin 500 mg twice a day, the most frequently reported adverse reactions, considered possibly or possibly related to study drug, with an incidence of 5% or greater, are uled below (Table 6). Approximately 8% of the patients who received 500 mg twice a day and 12% of the patients who received 1000 mg twice a day discontinued therapy due to drug related adverse reactions during the first 12 weeks of therapy; adverse reactions leading to discontinuation in at least 2 patients included nausea, vomiting, abdominal pain, diarrhea, rash, and asthenia.

Table 6. Selected Treatment-Related^aAdverse Reaction Incidence Rates (%) in Immunocompromised Adult Patients During the First 12 Weeks of Therapy with 500 mg Twice a Day ClarithromycinDose

Adverse Reaction Trial 1 (n=53) Trial 2 (n=255) Combined (n=308)

Abdominal Pain 8 2 3

Diarrhea 9 2 3

Flatulence 8 0 1

Headache 8 0 2

Nausea 28 9 12

Rash 9 2 3

Taste Perversion 19 0 4

Vomiting 25 4 8

a Includes those events possibly or probably related to study drug and excludes concurrent conditions

A limited number of pediatric AIDS patients have been treated with clarithromycin suspension for mycobacterial infections. The most frequently reported adverse reactions excluding those due to the patient's concurrent conditions were consistent with those observed in adult patients.

Changes in Laboratory Values

In the first 12 weeks of starting on clarithromycin 500 mg twice a day, 3% of patients has SGOT increases and 2% of patients has SGPT increases > 5 times the upper limit of normal in trial 2 (469 enrolled adult patients) while trial 1 (154 enrolled patients) had no elevation of transaminases. This includes only patients with baseline values within the normal range or borderline low.

Duodenal ulcer associated with H. pylori Infection

In clinical trials using combination therapy with clarithromycin plus omeprazole and amoxicillin, no adverse reactions specific to the combination of these drugs have been observed. Adverse reactions that have occurred have been limited to those that have been previously reported with clarithromycin, omeprazole or amoxicillin.

The adverse reaction profiles are shown below (Table 7) for four randomized double-blind clinical trials in which patients received the combination of clarithromycin 500 mg three times a day, and omeprazole 40 mg daily for 14 days, followed by omeprazole 20 mg once a day, (three studies) or 40 mg once a day (one study) for an additional 14 days. Of the 346 patients who received the combination, 3.5% of patients discontinued drug due to adverse reactions.

Table 7. Adverse Reactions with an Incidence of 3% or Greater

Adverse Reaction Clarithromycin + Omeprazole (n=346) % of Patients Omeprazole (n=355) % of Patients Clarithromycin (n=166) % of Patients^a

Taste Perversion 15 1 16

Nausea 5 1 3

Headache 5 6 9

Diarrhea 4 3 7

Vomiting 4 <1 1

Abdominal Pain 3 2 1

Infection 3 4 2

^a Only two of four studies

Changes in Laboratory Values

Changes in laboratory values with possible clinical significance in patients taking clarithromycin and omeprazole in four randomized double-blind trials in 945 patients are as follows:

Hepatic: elevated direct bilirubin <1%; GGT <1%; SGOT (AST) <1%; SGPT (ALT) <1%, Renal: elevated serum creatinine <1%.

Less Frequent Adverse Reactions Observed During Clinical Trials of Clarithromycin

Based on pooled data across all indications, the following adverse reactions were observed in clinical trials with clarithromycin at a rate less than 1%:

Blood and Lymphatic System Disorders: Leukopenia, neutropenia, thrombocythemia, eosinophilia

Cardiac Disorders: Electrocardiogram QT prolonged, cardiac arrest, atrial fibrillation, extrasystoles, palpitations

Ear and Labyrinth Disorders: Vertigo, tinnitus, hearing impaired

Gastrointestinal Disorders: Stomatitis, glossitis, esophagitis, gastrooesophageal reflux disease, gastritis, proctalgia, abdominal distension, constipation, dry mouth, eructation, flatulence

General Disorders and Administration Site Conditions: Malaise, pyrexia, asthenia, chest pain, chills, fatigue

Hepatobiliary Disorders: Cholestasis, hepatitis

Immune System Disorders: Hypersensitivity

Infections and Infestations: Cellulitis, gastroenteritis, infection, vaginal infection

Investigations: Blood bilirubin increased, blood alkaline phosphatase increased, blood lactate dehydrogenase increased, albumin globulin ratio abnormal

Metabolism and Nutrition Disorders: Anorexia, decreased appetite

Musculoskeletal and Connective Tissue Disorders: Myalgia, muscle spasms, nuchal rigidity

Nervous System Disorders: Dizziness, tremor, loss of consciousness, dyskinesia, somnolence

Psychiatric Disorders: Anxiety, nervousness

Renal and Urinary Disorders: Blood creatinine increased, blood urea increased

Respiratory, Thoracic and Mediastinal Disorders: Asthma, epistaxis, pulmonary embolism

Skin and Subcutaneous Tissue Disorders: Urticaria, dermatitis bullous, pruritus, hyperhidrosis, rash maculo-papular

Gastrointestinal Adverse Reactions

In the acute exacerbation of chronic bronchitis and acute maxillary sinusitis studies overall gastrointestinal adverse reactions were reported by a similar proportion of patients taking either clarithromycin tablets or clarithromycin extended-release tablets; however, patients taking clarithromycin extended-release tablets reported significantly less severe gastrointestinal symptoms compared to patients taking clarithromycin tablets. In addition, patients taking clarithromycin extended release tablets had significantly fewer premature discontinuations for drug-related gastrointestinal or abnormal taste adverse reactions compared to clarithromycin tablets.

All-Cause Mortality in Patients with Coronary Artery Disease 1 to 10 Years Following Clarithromycin Exposure

In one clinical trial evaluating treatment with clarithromycin on outcomes in patients with coronary artery disease, an increase in risk of all-cause mortality was observed in patients randomized to clarithromycin. Clarithromycin for treatment of coronary artery disease is not an approved indication. Patients were treated with clarithromycin or placebo for 14 days and observed for primary outcome events (e.g., all-cause mortality or non-fatal cardiac events) for several years.¹ A numerically higher number of primary outcome events in patients randomized to receive clarithromycin was observed with a hazard ratio of 1.06 (95% confidence interval 0.98 to 1.14). However, at follow-up 10 years post-treatment, there were 866 (40%) deaths in the clarithromycin group and 815 (37%) deaths in the placebo group that represented a hazard ratio for all-cause mortality of 1.10 (95% confidence interval 1.00 to 1.21). The difference in the number of deaths emerged after one year or more after the end of treatment.

The cause of the difference in all-cause mortality has not been established. Other epidemiologic studies evaluating this risk have shown variable results [see Warnings and Precautions (5.5)].

6.2 Postmarketing Experience
The following adverse reactions have been identified during post-approval use of clarithromycin. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Blood and Lymphatic System: Thrombocytopenia, agranulocytosis

Cardiac: Ventricular arrhythmia, ventricular tachycardia, torsades de pointes

Ear and Labyrinth: Deafness was reported chiefly in elderly women and was usually reversible.

Gastrointestinal: Pancreatitis acute, tongue discoloration, tooth discoloration was reported and was usually reversible with professional cleaning upon discontinuation of the drug.

There have been reports of clarithromycin extended release tablets in the stool, many of which have occurred in patients with anatomic (including ileostomy or colostomy) or functional gastrointestinal disorders with shortened GI transit times. In several reports, tablet residues have occurred in the context of diarrhea. It is recommended that patients who experience tablet residue in the stool and no improvement in their condition should be switched to a different clarithromycin formulation (e.g. suspension) or another antibacterial drug.

Hepatobiliary: Hepatic failure, jaundice hepatocellular. Adverse reactions related to hepatic dysfunction have been reported with clarithromycin [see Warnings and Precautions (5.2)].

Infections and Infestations: Pseudomembranous colitis [see Warnings and Precautions (5.6)]

Immune System: Anaphylactic reactions, angioedema

Investigations: Prothrombin time prolonged, white blood cell count decreased, international normalized ratio increased. Abnormal urine color has been reported, associated with hepatic failure.

Metabolism and Nutrition: Hypoglycemia has been reported in patients taking oral hypoglycemic agents or insulin.

Musculoskeletal and Connective Tissue: Myopathy rhabdomyolysis was reported and in some of the reports, clarithromycin was administered concomitantly with statins, fibrates, colchicine or allopurinol [see Contraindications (4.5) and Warnings and Precautions (5.4)].

Nervous System: Parosmia, anosmia, ageusia, paresthesia and convulsions

Psychiatric: Abnormal behavior, confusional state, depersonalization, disorientation, hallucination, depression, manic behavior, abnormal dream, psychotic disorder. These disorders usually resolve upon discontinuation of the drug.

Renal and Urinary: Nephritis interstitial, renal failure

Skin and Subcutaneous Tissue: Stevens-Johnson syndrome, toxic epidermal necrolysis, drug rash with eosinophilia and systemic symptoms (DRESS), Henoch-Schonlein purpura, acne, acute generalized exanthematous pustulosis

Vascular: Hemorrhage

7 Drug Interactions

Co-administration of clarithromycin is known to inhibit CYP3A, and a drug primarily metabolized by CYP3A may be associated with elevations in drug concentrations that could increase or prolong both therapeutic and adverse effects of the concomitant drug.

Clarithromycin should be used with caution in patients receiving treatment with other drugs known to be CYP3A enzyme substrates, especially if the CYP3A substrate has a narrow safety margin (e.g., carbamazepine) and/or the substrate is extensively metabolized by this enzyme. Adjust dosage when appropriate and monitor serum concentrations of drugs primarily metabolized by CYP3A closely in patients concurrently receiving clarithromycin.

Table 8: Clinically Significant Drug Interactions with Clarithromycin

Drugs That Are Affected By Clarithromycin

Drug(s) with Pharmacokinetics Affected by Clarithromycin Recommendation Comments

Antiarrhythmics:

Disopyramide Quinidine Dofetilide Amiodarone Sotalol Procainamide Not Recommended Disopyramide, Quinidine : There have been postmarketing reports of torsades de pointes occurring with concurrent use of clarithromycin and quinidine or disopyramide. Electrocardiograms should be monitored for QTc prolongation during coadministration of clarithromycin with these drugs [see Warnings and Precautions (5.3)] . Serum concentrations of these medications should also be monitored. There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with disopyramide and quinidine. There have been postmarketing reports of hypoglycemia with the concomitant administration of clarithromycin and disopyramide. Therefore, blood glucose levels should be monitored during concomitant administration of clarithromycin and disopyramide.

Digoxin Use With Caution Digoxin : Digoxin is a substrate for P-glycoprotein (Pgp) and clarithromycin is known to inhibit Pgp. When clarithromycin and digoxin are co-administered, inhibition of Pgp by clarithromycin may lead to increased exposure of digoxin. Elevated digoxin serum concentrations in patients receiving clarithromycin and digoxin concomitantly have been reported in postmarketing surveillance. Some patients have shown clinical signs consistent with digoxin toxicity, including potentially fatal arrhythmias. Monitoring of serum digoxin concentrations should be considered, especially for patients with digoxin concentrations in the upper therapeutic range.

Oral Anticoagulants:

Warfarin Use With Caution Oral anticoagulants : Spontaneous reports in the postmarketing period suggest that concomitant administration of clarithromycin and oral anticoagulants may potentiate the effects of the oral anticoagulants. Prothrombin times should be carefully monitored while patients are receiving clarithromycin and oral anticoagulants simultaneously [see Warnings and Precautions (5.4)] .

Antiepileptics:

Carbamazepine Use With Caution Carbamazepine : Concomitant administration of single doses of clarithromycin and carbamazepine has been shown to result in increased plasma concentrations of carbamazepine. Blood level monitoring of carbamazepine may be considered. Increased serum concentrations of carbamazepine were observed in clinical trials with clarithromycin. There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with carbamazepine.

Antifungals:

Itraconazole Use With Caution Itraconazole : Both clarithromycin and itraconazole are substrates and inhibitors of CYP3A, potentially leading to a bi-directional drug interaction when administered concomitantly (see also Itraconazole under "Drugs That Affect Clarithromycin" in the table below). Clarithromycin may increase the plasma concentrations of itraconazole. Patients taking itraconazole and clarithromycin concomitantly should be monitored closely for signs or symptoms of increased or prolonged adverse reactions.

Fluconazole No Dose Adjustment Fluconazole : [see Pharmacokinetics (12.3)]

Anti-Gout Agents:

Colchicine (in patients with renal or hepatic impairment) Colchicine (in patients with normal renal and hepatic function) Contraindicated Use With Caution Colchicine : Colchicine is a substrate for both CYP3A and the efflux transporter, P-glycoprotein (Pgp). Clarithromycin and other macrolides are known to inhibit CYP3A and Pgp. The dose of colchicine should be reduced when co-administered with clarithromycin in patients with normal renal and hepatic function [see Contraindications (4.4) and Warnings and Precautions (5.4)] .

Antipsychotics:

Pimozide Contraindicated Pimozide : [See Contraindications (4.2)]

Quetiapine Quetiapine : Quetiapine is a substrate for CYP3A4, which is inhibited by clarithromycin. Co-administration with clarithromycin could result in increased quetiapine exposure and possible quetiapine related toxicities. There have been postmarketing reports of somnolence, orthostatic hypotension, altered state of consciousness, neuroleptic malignant syndrome, and QT prolongation during concomitant administration. Refer to quetiapine prescribing information for recommendations on dose reduction if co-administered with CYP3A4 inhibitors such as clarithromycin.

Antispasmodics:

Tolterodine (patients deficient in CYP2D6 activity) Use With Caution Tolterodine : The primary route of metabolism for tolterodine is via CYP2D6. However, in a subset of the population devoid of CYP2D6, the identified pathway of metabolism is via CYP3A. In this population subset, inhibition of CYP3A results in significantly higher serum concentrations of tolterodine. Tolterodine 1 mg twice daily is recommended in patients deficient in CYP2D6 activity (poor metabolizers) when co-administered with clarithromycin.

Antivirals:

Atazanavir Use With Caution Atazanavir : Both clarithromycin and atazanavir are substrates and inhibitors of CYP3A, and there is evidence of a bi-directional drug interaction (see Atazanavir under "Drugs That Affect Clarithromycin" in the table below) [see Pharmacokinetics (12.3)] .

Saquinavir (in patients with decreased renal function) Saquinavir : Both clarithromycin and saquinavir are substrates and inhibitors of CYP3A and there is evidence of a bi-directional drug interaction (see Saquinavir under "Drugs That Affect Clarithromycin" in the table below) [see Pharmacokinetics (12.3)] .

Ritonavir Etravirine Ritonavir, Etravirine : (see Ritonavir and Etravirine under "Drugs That Affect Clarithromycin" in the table below) [see Pharmacokinetics (12.3)] .

Maraviroc Maraviroc : Clarithromycin may result in increases in maraviroc exposures by inhibition of CYP3A metabolism. See Selzentry^® prescribing information for dose recommendation when given with strong CYP3A inhibitors such as clarithromycin.

Boceprevir (in patients with normal renal function) Didanosine No Dose Adjustment Boceprevir : Both clarithromycin and boceprevir are substrates and inhibitors of CYP3A, potentially leading to a bi-directional drug interaction when co-administered. No dose adjustments are necessary for patients with normal renal function (see Victrelis^® prescribing information).

Zidovudine Zidovudine : Simultaneous oral administration of clarithromycin immediate-release tablets and zidovudine to HIV-infected adult patients may result in decreased steady-state zidovudine concentrations. Administration of clarithromycin and zidovudine should be separated by at least two hours [see Pharmacokinetics (12.3)] .

The impact of co-administration of clarithromycin extended-release tablets or granules and zidovudine has not been evaluated.

Calcium Channel Blockers:

Verapamil Use With Caution Verapamil : Hypotension, bradyarrhythmias, and lactic acidosis have been observed in patients receiving concurrent verapamil, [see Warnings and Precautions (5.4)] .

Amlodipine Diltiazem Amlodipine, Diltiazem : [See Warnings and Precautions (5.4)]

Nifedipine Nifedipine : Nifedipine is a substrate for CYP3A. Clarithromycin and other macrolides are known to inhibit CYP3A. There is potential of CYP3A-mediated interaction between nifedipine and clarithromycin. Hypotension and peripheral edema were observed when clarithromycin was taken concomitantly with nifedipine [see Warnings and Precautions (5.4)] .

Ergot Alkaloids:

Ergotamine Dihydroergotamine Contraindicated Ergotamine, Dihydroergotamine : Postmarketing reports indicate that coadministration of clarithromycin with ergotamine or dihydroergotamine has been associated with acute ergot toxicity characterized by vasospasm and ischemia of the extremities and other tissues including the central nervous system [see Contraindications (4.6)] .

Gastroprokinetic Agents:

Cisapride Contraindicated Cisapride : [See Contraindications (4.2)]

HMG-CoA Reductase Inhibitors:

Lovastatin Simvastatin Contraindicated Lovastatin, Simvastatin, Atorvastatin, Pravastatin, Fluvastatin : [See Contraindications (4.5) and Warnings and Precautions (5.4)]

Atorvastatin Pravastatin Use With Caution

Fluvastatin No Dose Adjustment

Hypoglycemic Agents:

Nateglinide Pioglitazone Repaglinide Rosiglitazone Use With Caution Nateglinide, Pioglitazone, Repaglinide, Rosiglitazone : [See Warnings and Precautions (5.4) and Adverse Reactions (6.2)]

Insulin Insulin : [See Warnings and Precautions (5.4) and Adverse Reactions (6.2)]

Immunosuppressants :

Cyclosporine Use With Caution Cyclosporine : There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with cyclosporine.

Tacrolimus Tacrolimus : There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with tacrolimus.

Phosphodiesterase inhibitors:

Sildenafil Tadalafil Vardenafil Use With Caution Sildenafil, Tadalafil, Vardenafil : Each of these phosphodiesterase inhibitors is primarily metabolized by CYP3A, and CYP3A will be inhibited by concomitant administration of clarithromycin. Co-administration of clarithromycin with sildenafil, tadalafil, or vardenafil will result in increased exposure of these phosphodiesterase inhibitors. Co-administration of these phosphodiesterase inhibitors with clarithromycin is not recommended. Increased systemic exposure of these drugs may occur with clarithromycin; reduction of dosage for phosphodiesterase inhibitors should be considered (see their respective prescribing information).

Proton Pump Inhibitors:

Omeprazole No Dose Adjustment Omeprazole : The mean 24-hour gastric pH value was 5.2 when omeprazole was administered alone and 5.7 when coadministered with clarithromycin as a result of increased omeprazole exposures [see Pharmacokinetics (12.3)] (see also Omeprazole under "Drugs That Affect Clarithromycin" in the table below).

Xanthine Derivatives:

Theophylline Use With Caution Theophylline : Clarithromycin use in patients who are receiving theophylline may be associated with an increase of serum theophylline concentrations [see Pharmacokinetics (12.3)] . Monitoring of serum theophylline concentrations should be considered for patients receiving high doses of theophylline or with baseline concentrations in the upper therapeutic range.

Triazolobenzodiazepines and Other Related Benzodiazepines:

Midazolam Use With Caution Midazolam : When oral midazolam is co-administered with clarithromycin, dose adjustments may be necessary and possible prolongation and intensity of effect should be anticipated [see Warnings and Precautions (5.4) and Pharmacokinetics (12.3)] .

Alprazolam Triazolam Triazolam, Alprazolam : Caution and appropriate dose adjustments should be considered when triazolam or alprazolam is co-administered with clarithromycin. There have been postmarketing reports of drug interactions and central nervous system (CNS) effects (e.g., somnolence and confusion) with the concomitant use of clarithromycin and triazolam. Monitoring the patient for increased CNS pharmacological effects is suggested. In postmarketing experience, erythromycin has been reported to decrease the clearance of triazolam and midazolam, and thus, may increase the pharmacologic effect of these benzodiazepines.

Temazepam Nitrazepam Lorazepam No Dose Adjustment Temazepam, Nitrazepam, Lorazepam : For benzodiazepines which are not metabolized by CYP3A (e.g., temazepam, nitrazepam, lorazepam), a clinically important interaction with clarithromycin is unlikely.

Cytochrome P450 Inducers:

Rifabutin Use With Caution Rifabutin : Concomitant administration of rifabutin and clarithromycin resulted in an increase in rifabutin, and decrease in clarithromycin serum levels together with an increased risk of uveitis (see Rifabutin under "Drugs That Affect Clarithromycin" in the table below).

Other Drugs Metabolized by CYP3A:

Alfentanil Bromocriptine Cilostazol Methylprednisole Vinblastine Phenobarbital St. John's Wort Use With Caution There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with alfentanil, methylprednisolone, cilostazol, bromocriptine, vinblastine, phenobarbital, and St. John's Wort.

Other Drugs Metabolized by CYP450 Isoforms Other than CYP3A:

Hexobarbital Phenytoin Valproate Use With Caution There have been postmarketing reports of interactions of clarithromycin with drugs not thought to be metabolized by CYP3A, including hexobarbital, phenytoin, and valproate.

Drugs that Affect Clarithromycin

Drug(s) that Affect the Pharmacokinetics of Clarithromycin Recommendation Comments

Antifungals:

Itraconazole Use With Caution Itraconazole : Itraconazole may increase the plasma concentrations of clarithromycin. Patients taking itraconazole and clarithromycin concomitantly should be monitored closely for signs or symptoms of increased or prolonged adverse reactions (see also Itraconazole under "Drugs That Are Affected By Clarithromycin" in the table above).

Antivirals:

Atazanavir Use With Caution Atazanavir: When clarithromycin is co-administered with atazanavir, the dose of clarithromycin should be decreased by 50% [see Clinical Pharmacology (12.3)] . Since concentrations of 14-OH clarithromycin are significantly reduced when clarithromycin is co-administered with atazanavir, alternative antibacterial therapy should be considered for indications other than infections due to Mycobacterium avium complex. Doses of clarithromycin greater than 1000 mg per day should not be co-administered with protease inhibitors.

Ritonavir (in patients with decreased renal function) Ritonavir : Since concentrations of 14-OH clarithromycin are significantly reduced when clarithromycin is co-administered with ritonavir, alternative antibacterial therapy should be considered for indications other than infections due to Mycobacterium avium [see Pharmacokinetics (12.3)] . Doses of clarithromycin greater than 1000 mg per day should not be co-administered with protease inhibitors.

Saquinavir (in patients with decreased renal function) Saquinavir : When saquinavir is co-administered with ritonavir, consideration should be given to the potential effects of ritonavir on clarithromycin (refer to ritonavir above) [see Pharmacokinetics (12.3)] .

Etravirine Etravirine : Clarithromycin exposure was decreased by etravirine; however, concentrations of the active metabolite, 14-OH-clarithromycin, were increased. Because 14-OH-clarithromycin has reduced activity against Mycobacterium avium complex (MAC), overall activity against this pathogen may be altered; therefore alternatives to clarithromycin should be considered for the treatment of MAC.

Saquinavir (in patients with normal renal function) Ritonavir (in patients with normal renal function) No Dose Adjustment

Proton Pump Inhibitors:

Omeprazole Use With Caution Omeprazole : Clarithromycin concentrations in the gastric tissue and mucus were also increased by concomitant administration of omeprazole [see Pharmacokinetics (12.3)] .

Miscellaneous Cytochrome P450 Inducers:

Efavirenz Nevirapine Rifampicin Rifabutin Rifapentine Use With Caution Inducers of CYP3A enzymes, such as efavirenz, nevirapine, rifampicin, rifabutin, and rifapentine will increase the metabolism of clarithromycin, thus decreasing plasma concentrations of clarithromycin, while increasing those of 14-OH-clarithromycin. Since the microbiological activities of clarithromycin and 14-OH-clarithromycin are different for different bacteria, the intended therapeutic effect could be impaired during concomitant administration of clarithromycin and enzyme inducers. Alternative antibacterial treatment should be considered when treating patients receiving inducers of CYP3A. There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with rifabutin (see Rifabutin under "Drugs That Are Affected By Clarithromycin" in the table above).

Co-administration of clarithromycin can alter the concentrations of other drugs. The potential for drug-drug interactions must be considered prior to and during therapy. (4, 5.2, 5.4, 7)

8 Use In Specific Populations

Geriatric: Increased risk of torsades de pointes (8.5)

8.1 Pregnancy
Teratogenic Effects

Pregnancy Category C

Clarithromycin should not be used in pregnant women except in clinical circumstances where no alternative therapy is appropriate. If pregnancy occurs while taking this drug, the patient should be apprised of the potential hazard to the fetus [see Warnings and Precautions (5.7)].

Four teratogenicity studies in rats (three with oral doses and one with intravenous doses up to 160 mg/kg/day administered during the period of major organogenesis) and two in rabbits at oral doses up to 125 mg/kg/day (approximately twice the recommended maximum human dose based on mg/m²) or intravenous doses of 30 mg/kg/day administered during gestation days 6 to 18 failed to demonstrate any teratogenicity from clarithromycin. Two additional oral studies in a different rat strain at similar doses and similar conditions demonstrated a low incidence of cardiovascular anomalies at doses of 150 mg/kg/day administered during gestation days 6 to 15. Plasma levels after 150 mg/kg/day were twice the human serum levels. Four studies in mice revealed a variable incidence of cleft palate following oral doses of 1000 mg/kg/day (2 and 4 times the recommended maximum human dose based on mg/m², respectively) during gestation days 6 to 15. Cleft palate was also seen at 500 mg/kg/day. The 1000 mg/kg/day exposure resulted in plasma levels 17 times the human serum levels. In monkeys, an oral dose of 70 mg/kg/day produced fetal growth retardation at plasma levels that were twice the human serum levels.

8.3 Nursing Mothers
Caution should be exercised when clarithromycin is administered to nursing women. The development and health benefits of human milk feeding should be considered along with the mother's clinical need for clarithromycin and any potential adverse effects on the human milk fed child from the drug or from the underlying maternal condition.

Clarithromycin and its active metabolite 14-hydroxy clarithromycin are excreted in human milk. Serum and milk samples were obtained after 3 days of treatment, at steady state, from one published study of 12 lactating women who were taking clarithromycin 250 mg orally twice daily. Based on the limited data from this study, and assuming milk consumption of 150 mL/kg/day, an exclusively human milk fed infant would receive an estimated average of 136 mcg/kg/day of clarithromycin and its active metabolite, with this maternal dosage regimen. This is less than 2% of the maternal weight-adjusted dose (7.8 mg/kg/day, based on the average maternal weight of 64 kg), and less than 1% of the pediatric dose (15 mg/kg/day) for children greater than 6 months of age.

A prospective observational study of 55 breastfed infants of mothers taking a macrolide antibacterial (6 were exposed to clarithromycin) were compared to 36 breastfed infants of mothers taking amoxicillin. Adverse reactions were comparable in both groups. Adverse reactions occurred in 12.7% of infants exposed to macrolides and included rash, diarrhea, loss of appetite, and somnolence.

8.4 Pediatric Use
The safety and effectiveness of clarithromycin tablets have been established for the treatment of the following conditions or diseases in pediatric patients 6 months and older. Use in these indications is based on clinical trials in pediatric patients or adequate and well-controlled studies in adults with additional pharmacokinetic and safety data in pediatric patients:

Pharyngitis/Tonsillitis

Community-Acquired Pneumonia

Acute maxillary sinusitis

Acute otitis media [see Clinical Studies (14.2)]

Uncomplicated skin and skin structure infections

The safety and effectiveness of clarithromycin tablets have been established for the prevention of disseminated Mycobacterium avium complex (MAC) disease in pediatric patients 20 months and older with advanced HIV infection. No studies of clarithromycin tablets for MAC prophylaxis have been performed in pediatric populations and the doses recommended for prophylaxis are derived from MAC pediatric treatment studies.

Safety and effectiveness of clarithromycin tablets in pediatric patients under 6 months of age have not been established. The safety of clarithromycin tablets has not been studied in MAC patients under the age of 20 months.

8.5 Geriatric Use
In a steady-state study in which healthy elderly subjects (65 years to 81 years of age) were given 500 mg of clarithromycin tablets every 12 hours, the maximum serum concentrations and area under the curves of clarithromycin and 14-OH clarithromycin were increased compared to those achieved in healthy young adults. These changes in pharmacokinetics parallel known age-related decreases in renal function. In clinical trials, elderly patients did not have an increased incidence of adverse reactions when compared to younger patients. Consider dosage adjustment in elderly patients with severe renal impairment. Elderly patients may be more susceptible to development of torsades de pointes arrhythmias than younger patients [see Warnings and Precautions (5.3)].

Most reports of acute kidney injury with calcium channel blockers metabolized by CYP3A4 (e.g., verapamil, amlodipine, diltiazem, nifedipine) involved elderly patients 65 years of age or older [see Warnings and Precautions (5.4)].

Especially in elderly patients, there have been reports of colchicine toxicity with concomitant use of clarithromycin and colchicine, some of which occurred in patients with renal insufficiency. Deaths have been reported in some patients [see Contraindications (4.4) and Warnings and Precautions (5.4)].

8.6 Renal and Hepatic Impairment
Clarithromycin is principally excreted via the liver and kidney. Clarithromycin may be administered without dosage adjustment to patients with hepatic impairment and normal renal function. However, in the presence of severe renal impairment with or without coexisting hepatic impairment, decreased dosage or prolonged dosing intervals may be appropriate [see Dosage and Administration (2.5)].

10 Overdosage

Overdosage of clarithromycin can cause gastrointestinal symptoms such as abdominal pain, vomiting, nausea, and diarrhea.

Treat adverse reactions accompanying overdosage by the prompt elimination of unabsorbed drug and supportive measures. As with other macrolides, clarithromycin serum concentrations are not expected to be appreciably affected by hemodialysis or peritoneal dialysis.

11 Description

Clarithromycin is a semi-synthetic macrolide antimicrobial for oral use. Chemically, it is 6-0-methylerythromycin. The molecular formula is C₃₈H₆₉NO₁₃, and the molecular weight is 747.96. The structural formula is:
Figure 1: Structure of Clarithromycin

Clarithromycin is a white to off-white crystalline powder. It is soluble in acetone, slightly soluble in methanol, ethanol, and acetonitrile, and practically insoluble in water.

Clarithromycin tablets, USP are available as immediate-release tablets.

Each white oval film-coated immediate-release clarithromycin tablet, USP contains 250 mg or 500 mg of clarithromycin and the following inactive ingredients:

250 mg tablets: microcrystalline cellulose, lactose monohydrate, hydroxypropyl cellulose, sodium starch glycolate, colloidal silicon dioxide, talc, magnesium stearate, hypromellose, titanium dioxide, and polyethylene glycol.

500 mg tablets: microcrystalline cellulose, lactose monohydrate, hydroxypropyl cellulose, sodium starch glycolate, colloidal silicon dioxide, talc, magnesium stearate, hypromellose, titanium dioxide, and polyethylene glycol.

12 Clinical Pharmacology

12.1 Mechanism of Action
Clarithromycin is a macrolide antimicrobial drug [see Microbiology (12.4)].

12.3 Pharmacokinetics
Absorption

Clarithromycin Immediate-Release Tablets

The absolute bioavailability of 250 mg clarithromycin tablets was approximately 50%. For a single 500 mg dose of clarithromycin, food slightly delays the onset of clarithromycin absorption, increasing the peak time from approximately 2 to 2.5 hours. Food also increases the clarithromycin peak plasma concentration by about 24%, but does not affect the extent of clarithromycin bioavailability. Food does not affect the onset of formation of the active metabolite, 14-OH clarithromycin or its peak plasma concentration but does slightly decrease the extent of metabolite formation, indicated by an 11% decrease in area under the plasma concentration-time curve (AUC). Therefore, clarithromycin tablets may be given without regard to food. In non-fasting healthy human subjects (males and females), peak plasma concentrations were attained within 2 to 3 hours after oral dosing.

Distribution

Clarithromycin and the 14-OH clarithromycin metabolite distribute readily into body tissues and fluids. There are no data available on cerebrospinal fluid penetration. Because of high intracellular concentrations, tissue concentrations are higher than serum concentrations. Examples of tissue and serum concentrations are presented below.

Table 9. Tissue and Serum Concentrations of Clarithromycin

CONCENTRATION (after 250 mg every 12 hours)

Tissue Type Tissue (mcg/g) Serum (mcg/mL)

Tonsil 1.6 0.8

Lung 8.8 1.7

Metabolism and Elimination

Clarithromycin Immediate-Release Tablets

Steady-state peak plasma clarithromycin concentrations were attained within 3 days and were approximately 1 mcg/mL to 2 mcg/mL with a 250 mg dose administered every 12 hours and 3 mcg/mL to 4 mcg/mL with a 500 mg dose administered every 8 hours to 12 hours. The elimination half-life of clarithromycin was about 3 hours to 4 hours with 250 mg administered every 12 hours but increased to 5 hours to 7 hours with 500 mg administered every 8 hours to 12 hours. The nonlinearity of clarithromycin pharmacokinetics is slight at the recommended doses of 250 mg and 500 mg administered every 8 hours to 12 hours. With a 250 mg every 12 hours dosing, the principal metabolite, 14-OH clarithromycin, attains a peak steady-state concentration of about 0.6 mcg/mL and has an elimination half-life of 5 hours to 6 hours. With a 500 mg every 8 hours to 12 hours dosing, the peak steady-state concentration of 14-OH clarithromycin is slightly higher (up to 1 mcg/mL), and its elimination half-life is about 7 hours to 9 hours. With any of these dosing regimens, the steady-state concentration of this metabolite is generally attained within 3 days to 4 days.

After a 250 mg tablet every 12 hours, approximately 20% of the dose is excreted in the urine as clarithromycin, while after a 500 mg tablet every 12 hours, the urinary excretion of clarithromycin is somewhat greater, approximately 30%. In comparison, after an oral dose of 250 mg (125 mg/5 mL) suspension every 12 hours, approximately 40% is excreted in urine as clarithromycin. The renal clearance of clarithromycin is, however, relatively independent of the dose size and approximates the normal glomerular filtration rate. The major metabolite found in urine is 14-OH clarithromycin, which accounts for an additional 10% to 15% of the dose with either a 250 mg or a 500 mg tablet administered every 12 hours.

Specific Populations for Clarithromycin Tablets

Clarithromycin penetrates into the middle ear fluid of pediatric patients with secretory otitis media.

Table 10. Middle Ear Fluid and Serum Concentrations of Clarithromycin and 14-OH-Clarithromycin in Pediatric Patients

CONCENTRATION (after 7.5 mg/kg every 12 hours for 5 doses)

Analyte Middle Ear Fluid (mcg/mL) Serum (mcg/mL)

Clarithromycin 2.5 1.7

14-OH Clarithromycin 1.3 0.8

When pediatric patients (n = 10) were administered a single oral dose of 7.5 mg/kg clarithromycin as an oral suspension, food increased mean peak plasma clarithromycin concentrations from 3.6 (± 1.5) mcg/mL to 4.6 (± 2.8) mcg/mL and the extent of absorption from 10.0 (± 5.5) hr•mcg/mL to 14.2 (± 9.4) hr•mcg/mL.

In pediatric patients requiring antibacterial therapy, administration of 7.5 mg/kg every 12 hours of clarithromycin as an oral suspension generally resulted in steady-state peak plasma concentrations of 3 mcg/mL to 7 mcg/mL for clarithromycin and 1 mcg/mL to 2 mcg/mL for 14-OH clarithromycin.

In HIV-infected pediatric patients taking 15 mg/kg of clarithromycin as an oral suspension every 12 hours, steady-state clarithromycin peak concentrations generally ranged from 6 mcg/mL to 15 mcg/mL.

HIV Infection

Steady-state concentrations of clarithromycin and 14-OH clarithromycin observed following administration of 500 mg doses of clarithromycin every 12 hours to adult patients with HIV infection were similar to those observed in healthy volunteers. In adult HIV-infected patients taking 500-mg or 1000-mg doses of clarithromycin every 12 hours, steady-state clarithromycin C_max values ranged from 2 mcg/mL to 4 mcg/mL and 5 mcg/mL to 10 mcg/mL, respectively.

Hepatic Impairment

The steady-state concentrations of clarithromycin in subjects with impaired hepatic function did not differ from those in normal subjects; however, the 14-OH clarithromycin concentrations were lower in the hepatically impaired subjects. The decreased formation of 14-OH clarithromycin was at least partially offset by an increase in renal clearance of clarithromycin in the subjects with impaired hepatic function when compared to healthy subjects.

Renal Impairment

The pharmacokinetics of clarithromycin was also altered in subjects with impaired renal function [see Use in Specific Populations (8.6) and Dosage and Administration (2.5)].

Drug Interactions

Fluconazole

Following administration of fluconazole 200 mg daily and clarithromycin 500 mg twice daily to 21 healthy volunteers, the steady-state clarithromycin C_min and AUC increased 33% and 18%, respectively. Clarithromycin exposures were increased and steady-state concentrations of 14-OH clarithromycin were not significantly affected by concomitant administration of fluconazole.

Colchicine

When a single dose of colchicine 0.6 mg was administered with clarithromycin 250 mg BID for 7 days, the colchicine C_max increased 197% and the AUC_0-∞ increased 239% compared to administration of colchicine alone.

Atazanavir

Following administration of clarithromycin (500 mg twice daily) with atazanavir (400 mg once daily), the clarithromycin AUC increased 94%, the 14-OH clarithromycin AUC decreased 70% and the atazanavir AUC increased 28%.

Ritonavir

Concomitant administration of clarithromycin and ritonavir (n = 22) resulted in a 77% increase in clarithromycin AUC and a 100% decrease in the AUC of 14-OH clarithromycin.

Saquinavir

Following administration of clarithromycin (500 mg bid) and saquinavir (soft gelatin capsules, 1200 mg tid) to 12 healthy volunteers, the steady-state saquinavir AUC and C_max increased 177% and 187% respectively compared to administration of saquinavir alone. Clarithromycin AUC and C_max increased 45% and 39% respectively, whereas the 14–OH clarithromycin AUC and C_max decreased 24% and 34% respectively, compared to administration with clarithromycin alone.

Didanosine

Simultaneous administration of clarithromycin tablets and didanosine to 12 HIV-infected adult patients resulted in no statistically significant change in didanosine pharmacokinetics.

Zidovudine

Following administration of clarithromycin 500 mg tablets twice daily with zidovudine 100 mg every 4 hours, the steady-state zidovudine AUC decreased 12% compared to administration of zidovudine alone (n=4). Individual values ranged from a decrease of 34% to an increase of 14%. When clarithromycin tablets were administered two to four hours prior to zidovudine, the steady-state zidovudine C_max increased 100% whereas the AUC was unaffected (n=24).

Omeprazole

Clarithromycin 500 mg every 8 hours was given in combination with omeprazole 40 mg daily to healthy adult subjects. The steady-state plasma concentrations of omeprazole were increased (C_max, AUC_0-24, and t½ increases of 30%, 89%, and 34%, respectively), by the concomitant administration of clarithromycin.

The plasma levels of clarithromycin and 14–OH clarithromycin were increased by the concomitant administration of omeprazole. For clarithromycin, the mean C_max was 10% greater, the mean C_min was 27% greater, and the mean AUC_0-8 was 15% greater when clarithromycin was administered with omeprazole than when clarithromycin was administered alone. Similar results were seen for 14–OH clarithromycin, the mean C_max was 45% greater, the mean C_min was 57% greater, and the mean AUC_0-8 was 45% greater. Clarithromycin concentrations in the gastric tissue and mucus were also increased by concomitant administration of omeprazole.

Clarithromycin Tissue Concentrations 2 hours after Dose (mcg/mL)/(mcg/g)

Treatment N antrum fundus N Mucus

Clarithromycin 5 10.48 ± 2.01 20.81 ± 7.64 4 4.15 ± 7.74

Clarithromycin + Omeprazole 5 19.96 ± 4.71 24.25 ± 6.37 4 39.29 ± 32.79

Theophylline

In two studies in which theophylline was administered with clarithromycin (a theophylline sustained-release formulation was dosed at either 6.5 mg/kg or 12 mg/kg together with 250 or 500 mg q12h clarithromycin), the steady-state levels of C_max, C_min, and the area under the serum concentration time curve (AUC) of theophylline increased about 20%.

Midazolam

When a single dose of midazolam was co-administered with clarithromycin tablets (500 mg twice daily for 7 days), midazolam AUC increased 174% after intravenous administration of midazolam and 600% after oral administration.

For information about other drugs indicated in combination with clarithromycin, refer to their full prescribing information, CLINICAL PHARMACOLOGY section.

12.4 Microbiology
Mechanism of Action

Clarithromycin exerts its antibacterial action by binding to the 50S ribosomal subunit of susceptible bacteria resulting in inhibition of protein synthesis.

Resistance

The major routes of resistance are modification of the 23S rRNA in the 50S ribosomal subunit to insensitivity or drug efflux pumps. Beta-lactamase production should have no effect on clarithromycin activity.

Most isolates of methicillin-resistant and oxacillin-resistant staphylococci are resistant to clarithromycin.

If H. pylori is not eradicated after treatment with clarithromycin-containing combination regimens, patients may develop clarithromycin resistance in H. pylori isolates. Therefore, for patients who fail therapy, clarithromycin susceptibility testing should be done, if possible.

Patients with clarithromycin-resistant H. pylori should not be treated with any of the following: omeprazole/clarithromycin dual therapy; omeprazole/clarithromycin/amoxicillin triple therapy; lansoprazole/clarithromycin/amoxicillin triple therapy; or other regimens which include clarithromycin as the sole antibacterial agent.

Antimicrobial Activity

Clarithromycin has been shown to be active against most of the isolates of the following microorganisms both in vitro and in clinical infections [see Indications and Usage (1)].

Gram-Positive Bacteria

Staphylococcus aureus

Streptococcus pneumoniae

Streptococcus pyogenes

Gram-Negative Bacteria

Haemophilus influenzae

Haemophilus parainfluenzae

Moraxella catarrhalis

Other Microorganisms

Chlamydophila pneumoniae

Helicobacter pylori

Mycobacterium avium complex (MAC) consisting of M. avium and M. intracellulare

Mycoplasma pneumoniae

At least 90 percent of the microorganisms uled below exhibit in vitro minimum inhibitory concentrations (MICs) less than or equal to the clarithromycin susceptible MIC breakpoint for organisms of similar type to those shown in Table 11. However, the efficacy of clarithromycin in treating clinical infections due to these microorganisms has not been established in adequate and well-controlled clinical trials.

Gram-Positive Bacteria

Streptococcus agalactiae

Streptococci (Groups C, F, G)

Viridans group streptococci

Gram-Negative Bacteria

Legionella pneumophila

Pasteurella multocida

Anaerobic Bacteria

Clostridium perfringens

Peptococcus niger

Prevotella melaninogenica

Propionibacterium acnes

Susceptibility Testing

For specific information regarding susceptibility test interpretive criteria and associated test methods and quality control standards recognized by FDA for this drug, please see: https://www.fda.gov/STIC.

13 Nonclinical Toxicology

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
The following in vitro mutagenicity tests have been conducted with clarithromycin:

Salmonella /Mammalian Microsomes Test

Bacterial Induced Mutation Frequency Test

In Vitro Chromosome Aberration Test

Rat Hepatocyte DNA Synthesis Assay

Mouse Lymphoma Assay

Mouse Dominant Lethal Study

Mouse Micronucleus Test

All tests had negative results except the in vitro chromosome aberration test which was positive in one test and negative in another. In addition, a bacterial reverse-mutation test (Ames test) has been performed on clarithromycin metabolites with negative results.

Impairment of Fertility

Fertility and reproduction studies have shown that daily doses of up to 160 mg/kg/ to male and female rats caused no adverse effects on the estrous cycle, fertility, parturition, or number and viability of offspring. Plasma levels in rats after 150 mg/kg/day were twice the human serum levels.

Testicular atrophy occurred in rats at doses 7 times, in dogs at doses 3 times, and in monkeys at doses 8 times greater than the maximum human daily dose (on a body surface area basis).

13.2 Animal Toxicology and/or Pharmacology
Corneal opacity occurred in dogs at doses 12 times and in monkeys at doses 8 times greater than the maximum human daily dose (on a body surface area basis). Lymphoid depletion occurred in dogs at doses 3 times greater than and in monkeys at doses 2 times greater than the maximum human daily dose (on a body surface area basis).

14 Clinical Studies

14.1 Mycobacterial Infections
Prophylaxis of Mycobacterial Infections

A randomized, double-blind clinical trial (trial 3) compared clarithromycin 500 mg twice a day to placebo in patients with CDC-defined AIDS and CD₄ counts less than 100 cells/μL. This trial accrued 682 patients from November 1992 to January 1994, with a median CD₄ cell count at entry of 30 cells/mcL. Median duration of clarithromycin tablets was 10.6 months vs. 8.2 months for placebo. More patients in the placebo arm than the clarithromycin tablets arm discontinued prematurely from the trial (75.6% and 67.4%, respectively). However, if premature discontinuations due to Mycobacterium avium complex (MAC) or death are excluded, approximately equal percentages of patients on each arm (54.8%) on clarithromycin tablets and 52.5% on placebo) discontinued study drug early for other reasons. The trial was designed to evaluate the following endpoints:

MAC bacteremia, defined as at least one positive culture for Mycobacterium avium complex bacteria from blood or another normally sterile site

Survival

Clinically significant disseminated MAC disease, defined as MAC bacteremia accompanied by signs or symptoms of serious MAC infection, including fever, night sweats, weight loss, anemia, or elevations in liver function tests

MAC Bacteremia

In patients randomized to clarithromycin tablets, the risk of MAC bacteremia was reduced by 69% compared to placebo. The difference between groups was statistically significant (p < 0.001). On an intent-to-treat basis, the one-year cumulative incidence of MAC bacteremia was 5.0% for patients randomized to clarithromycin tablets and 19.4% for patients randomized to placebo. While only 19 of the 341 patients randomized to clarithromycin tablets developed MAC, 11 of these cases were resistant to clarithromycin tablets. The patients with resistant MAC bacteremia had a median baseline CD₄ count of 10 cells/mm³(range 2 cells/mm³to 25 cells/mm³). Information regarding the clinical course and response to treatment of the patients with resistant MAC bacteremia is limited. The 8 patients who received clarithromycin tablets and developed susceptible MAC bacteremia had a median baseline CD₄ count of 25 cells/mm³(range 10 cells/mm³to 80 cells/mm³). Comparatively, 53 of the 341 placebo patients developed MAC; none of these isolates were resistant to clarithromycin tablets. The median baseline CD₄ count was 15 cells/mm³(range 2 cells/mm³to 130 cells/mm³) for placebo patients that developed MAC.

Survival

A statistically significant survival benefit of clarithromycin tablets compared to placebo was observed (see Figure 3 and Table 13). Since the analysis at 18 months includes patients no longer receiving prophylaxis the survival benefit of clarithromycin tablets may be underestimated.
Figure 3. Survival of All Randomized AIDS Patients Over Time in Trial 3

Table 13. Mortality Rates at 18 months in Trial 3

Mortality Rates Reduction in Mortality Rates on

Placebo Clarithromycin Tablets Clarithromycin Tablets

6 month 9.4% 6.5% 31%

12 month 29.7% 20.5% 31%

18 month 46.4% 37.5% 20%

Clinically Significant Disseminated MAC Disease

In association with the decreased incidence of MAC bacteremia, patients in the group randomized to clarithromycin tablets showed reductions in the signs and symptoms of disseminated MAC disease, including fever, night sweats, weight loss, and anemia.

Treatment of Mycobacterial Infections

Dose-Ranging Monotherapy Trials in Adult AIDS Patients with MAC

Two randomized clinical trials (Trials 1 and 2) compared different dosages of clarithromycin tablets in patients with CDC-defined AIDS and CD₄ counts less than100 cells/mcL. These trials accrued patients from May 1991 to March 1992. Trial 500 was a randomized, double-blind trial; trial 577 was an open-label compassionate use trial. Both trials used 500 mg and 1000 mg twice daily dosing of clarithromycin tablets; trial 1 also had a 2000 mg twice daily clarithromycin tablets group. Trial 1 enrolled 154 adult patients and trial 2 enrolled 469 adult patients. The majority of patients had CD₄ cell counts less than 50 cells/mcL at study entry. The trials were designed to evaluate the following end points:

1. Change in MAC bacteremia or blood cultures negative for M. avium.

2. Change in clinical signs and symptoms of MAC infection including one or more of the following: fever, night sweats, weight loss, diarrhea, splenomegaly, and hepatomegaly.

The results for trial 1 are described below. The trial 2 results were similar to the results of trial 1.

MAC Bacteremia

Decreases in MAC bacteremia or negative blood cultures were seen in the majority of patients in all clarithromycin tablets dosage groups. The mean reductions in MAC colony forming units (CFU) from baseline after 4 weeks of therapy in the 1000 mg (n=32) twice daily and 2000 mg (n=26) twice daily regimen was 2.3 Log CFU compared to 1.5 Log CFU in the clarithromycin tablets 500 mg twice daily (n=35) regimen. A separate trial with a four drug regimen⁷(ciprofloxacin, ethambutol, rifampicin, and clofazimine) had a mean reduction of 1.4 Log CFU.

Clinical outcomes evaluated with the different dosing regimens of clarithromycin monotherapy are shown in Table 14. The 1000 mg and 2000 mg twice daily doses showed significantly better control of bacteremia during the first four weeks of therapy. No significant differences were seen beyond that point. All of the isolates had MIC less than 8 mcg/mL at pre-treatment. Relapse was almost always accompanied by an increase in MIC.

Table 14. Outcome with the Different Dosing Regimens of Clarithromycin Tablets

Outcome Clarithromycin Tablets 500 mg twice daily Clarithromycin Tablets 1000 mg twice daily Clarithromycin Tablets 2000 mg twice daily

One or more negative blood cultures at any time during acute therapy 61% (30/49) 59% (29/49) 52% (25/48)

Two or more negative blood cultures during acute therapy sustained through study day 84 25% (12/49) 25% (12/49) 8% (4/48)

Death or discontinuation by day 84 23% (11/49) 37% (18/49) 56% (27/48)

Relapse by day 84 14% (7/49) 12% (6/49) 13% (6/48)

Median time to first negative culture (in days) 54 41 29

Median time to first decrease of at least 1 log CFU (in days) 29 16 15

Median time to first positive culture or study discontinuation following the first negative culture (in days) 43 59 43

Clinically Significant Disseminated MAC Disease

Among patients experiencing night sweats prior to therapy, 84% showed resolution or improvement at some point during the 12 weeks of clarithromycin tablets at 500 mg to 2000 mg twice daily doses. Similarly, 77% of patients reported resolution or improvement in fevers at some point. Response rates for clinical signs of MAC are given in Table 15 below.

The median duration of response, defined as improvement or resolution of clinical signs and symptoms, was 2 weeks to 6 weeks.

Since the trial was not designed to determine the benefit of monotherapy beyond 12 weeks, the duration of response may be underestimated for the 25% to 33% of patients who continued to show clinical response after 12 weeks.

Table 15. Response Rates for Clinical Signs of MAC During 6 Weeks to 12 Weeks of Treatment

Resolution of Fever Resolution of Night Sweats

Clarithromycin Tablets twice daily dose (mg) % ever afebrile % afebrile 6 weeks or more Clarithromycin Tablets twice daily dose (mg) % ever resolving % resolving 6 weeks or more

500 67% 23% 500 85% 42%

1000 67% 12% 1000 70% 33%

2000 62% 22% 2000 72% 36%

Weight Gain Greater Than 3% Hemoglobin Increase Greater Than 1 gm

Clarithromycin Tablets twice daily dose (mg) % ever gaining % gaining 6 weeks or more Clarithromycin Tablets twice daily dose (mg) % ever increasing % increasing 6 weeks or more

500 33% 14% 500 58% 26%

1000 26% 17% 1000 37% 6%

2000 26% 12% 2000 62% 18%

Survival

Median survival time from trial entry (trial 1) was 249 days at the 500 mg twice daily dose compared to 215 days with the 1000 mg twice daily dose. However, during the first 12 weeks of therapy, there were 2 deaths in 53 patients in the 500 mg twice daily group versus 13 deaths in 51 patients in the 1000 mg twice daily group. The reason for this apparent mortality difference is not known. Survival in the two groups was similar beyond 12 weeks. The median survival times for these dosages were similar to recent historical controls with MAC when treated with combination therapies.⁷

Median survival time from entry in trial 2 was 199 days for the 500 mg twice a day dose and 179 days for the 1000 mg twice a day dose. During the first four weeks of therapy, while patients were maintained on their originally assigned dose, there were 11 deaths in 255 patients taking 500 mg twice daily and 18 deaths in 214 patients taking 1000 mg twice daily.

Dosage-Ranging Monotherapy Trials in Pediatric AIDS Patients with MAC

Trial 4 was a pediatric trial of 3.75 mg/kg, 7.5 mg/kg, and 15 mg/kg of clarithromycin tablets twice daily in patients with CDC-defined AIDS and CD₄ counts less than 100 cells/mcL. The trial enrolled 25 patients between the ages of 1 to 20. The trial evaluated the same endpoints as in the adult trials 1 and 2. Results with the 7.5 mg/kg twice daily dose in the pediatric trial were comparable to those for the 500 mg twice daily regimen in the adult trials.

Combination Therapy in AIDS Patients with Disseminated MAC

Trial 5 compared the safety and efficacy of clarithromycin tablets in combination with ethambutol versus clarithromycin tablets in combination with ethambutol and clofazimine for the treatment of disseminated MAC (dMAC) infection. This 24-week trial enrolled 106 patients with AIDS and dMAC, with 55 patients randomized to receive clarithromycin tablets and ethambutol, and 51 patients randomized to receive clarithromycin, ethambutol, and clofazime. Baseline characteristics between treatment arms were similar with the exception of median CFU counts being at least 1 log higher in the clarithromycin tablets, ethambutol, and clofazime arm.

Compared to prior experience with clarithromycin monotherapy, the two-drug regimen of clarithromycin and ethambutol extended the time to microbiologic relapse, largely through suppressing the emergence of clarithromycin resistant strains. However, the addition of clofazimine to the regimen added no additional microbiologic or clinical benefit. Tolerability of both multidrug regimens was comparable with the most common adverse events being gastrointestinal in nature. Patients receiving the clofazimine-containing regimen had reduced survival rates; however, their baseline mycobacterial colony counts were higher. The results of this trial support the addition of ethambutol to clarithromycin for the treatment of initial dMAC infections but do not support adding clofazimine as a third agent.

14.2 Otitis Media
Otitis Media Trial of clarithromycin tablets vs. Oral Cephalosporin

In a controlled clinical trial of pediatric patients with acute otitis media performed in the United States, where significant rates of beta-lactamase producing organisms were found, clarithromycin tablets was compared to an oral cephalosporin. In this trial, strict evaluability criteria were used to determine clinical response. For the 223 patients who were evaluated for clinical efficacy, the clinical success rate (i.e., cure plus improvement) at the post-therapy visit was 88% for clarithromycin tablets and 91% for the cephalosporin.

In a smaller number of patients, microbiologic determinations were made at the pre-treatment visit. The presumptive bacterial eradication/clinical cure outcomes (i.e., clinical success) are shown in Table 16.

Table 16. Clinical Success Rates of Otitis Media Treatment by Pathogen

Pathogen Clinical Success Rates

Clarithromycin Tablets Oral Cephalosporin

S. pneumoniae 13/15 (87%) 4/5

H. influenzae^a 10/14 (71%) 3/4

M. catarrhalis 4/5 1/1

S. pyogenes 3/3 0/1

All Pathogens Combined 30/37 (81%) 8/11 (73%)

^a None of the H. influenzae isolated pre-treatment was resistant to clarithromycin tablets; 6% were resistant to the control agent.

Otitis Media Trials of Clarithromycin Tablets vs. Antimicrobial/Beta-lactamase Inhibitor

In two other controlled clinical trials of acute otitis media performed in the United States, where significant rates of beta-lactamase producing organisms were found, clarithromycin tablets was compared to an oral antimicrobial agent that contained a specific beta-lactamase inhibitor. In these trials, strict evaluability criteria were used to determine the clinical responses. In the 233 patients who were evaluated for clinical efficacy, the combined clinical success rate (i.e., cure and improvement) at the post-therapy visit was 91% for both clarithromycin tablets and the control.

For the patients who had microbiologic determinations at the pre-treatment visit, the presumptive bacterial eradication/clinical cure outcomes (i.e., clinical success) are shown in Table 17.

Table 17. Clinical Success Rates of Acute Otitis Media Treatment by Pathogen

Clinical Success Rates

PATHOGEN Clarithromycin Tablets Antimicrobial/ Beta-lactamase Inhibitor

S. pneumoniae 43/51 (84%) 55/56 (98%)

H. influenzae ^a 36/45 (80%) 31/33 (94%)

M. catarrhalis 9/10 (90%) 6/6

S. pyogenes 3/3 5/5

All Pathogens Combined 91/109 (83%) 97/100 (97%)

^a Of the H. influenzae isolated pre-treatment, 3% were resistant to clarithromycin tablets and 10% were resistant to the control agent.

14.3 H. pylori Eradication to Decrease the Risk of Duodenal Ulcer Recurrence
Clarithromycin tablets + Lansoprazole and Amoxicillin

Two U.S. randomized, double-blind clinical trials (trial 6 and trial 7) in patients with H. pylori and duodenal ulcer disease (defined as an active ulcer or history of an active ulcer within one year) evaluated the efficacy of clarithromycin tablets 500 mg twice daily in combination with lansoprazole 30 mg twice daily and amoxicillin 1 gm twice daily as 14-day triple therapy for eradication of H. pylori.

H. pylori eradication was defined as two negative tests (culture and histology) at 4 weeks to 6 weeks following the end of treatment.

The combination of clarithromycin tablets plus lansoprazole and amoxicillin as triple therapy was effective in eradication of H. pylori (see results in Table 18). Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence.

A randomized, double-blind clinical trial (trial 8) performed in the U.S. in patients with H. pylori and duodenal ulcer disease (defined as an active ulcer or history of an ulcer within one year) compared the efficacy of clarithromycin tablets in combination with lansoprazole and amoxicillin as triple therapy for 10 days and 14 days. This trial established that the 10-day triple therapy was equivalent to the 14-day triple therapy in eradicating H. pylori (see results in Table 18).

Trial Duration Triple Therapy Evaluable Analysis^a Triple Therapy Intent-to-Treat Analysis^b

Trial 6 14 days 92^c [80 to 97.7] (n = 48) 86^c [73.3 to 93.5] (n = 55)

Trial 7 14 days 86^d [75.7 to 93.6] (n = 66) 83^d [72 to 90.8] (n = 70)

Trial 8^e 14 days 85 [77 to 91] (N = 113) 82 [73.9 to 88.1] (N = 126)

10 days 84 [76 to 89.8] (N = 123) 81 [73.9 to 87.6] (N = 135)

^a Based on evaluable patients with confirmed duodenal ulcer (active or within one year) and H. pylori infection at baseline defined as at least two of three positive endoscopic tests from CLOtest (Delta West LTD., Bentley, Australia), histology, and/or culture. Patients were included in the analysis if they completed the trial. Additionally, if patients were dropped out of the trial due to an adverse reaction related to the drug, they were included in the analysis as evaluable failures of therapy. ^b Patients were included in the analysis if they had documented H. pylori infection at baseline as defined above and had a confirmed duodenal ulcer (active or within one year). All dropouts were included as failures of therapy. ^c (p < 0.05) versus clarithromycin tablets/lansoprazole and lansoprazole/amoxicillin dual therapy. ^d (p < 0.05) versus clarithromycin tablets/amoxicillin dual therapy. ^e The 95% confidence interval for the difference in eradication rates, 10-day minus 14-day, is (10.5, 8.1) in the evaluable analysis and (-9.7, 9.1) in the intent-to-treat analysis

Clarithromycin tablets + Omeprazole and Amoxicillin Therapy

Three U.S., randomized, double-blind clinical trials in patients with H. pylori infection and duodenal ulcer disease (n = 558) compared clarithromycin tablets plus omeprazole and amoxicillin to clarithromycin tablets plus amoxicillin. Two trials (trials 9 and 10) were conducted in patients with an active duodenal ulcer, and the third trial (trial 11) was conducted in patients with a duodenal ulcer in the past 5 years, but without an ulcer present at the time of enrollment. The dosage regimen in the trials was clarithromycin tablets 500 mg twice a day plus omeprazole 20 mg twice a day plus amoxicillin 1 gram twice a day for 10 days. In trials 9 and 10, patients who took the omeprazole regimen also received an additional 18 days of omeprazole 20 mg once a day. Endpoints studied were eradication of H. pylori and duodenal ulcer healing (trials 9 and 10 only). H. pylori status was determined by CLOtest^®, histology, and culture in all three trials. For a given patient, H. pylori was considered eradicated if at least two of these tests were negative, and none was positive. The combination of clarithromycin tablets plus omeprazole and amoxicillin was effective in eradicating H. pylori (see results in Table 19).

Table 19. H. pylori Eradication Rates: % of Patients Cured [95% Confidence Interval]

Clarithromycin Tablets + omeprazole + amoxicillin Clarithromycin Tablets + amoxicillin

Per-Protocol^a Intent-to-Treat^b Per-Protocol^a Intent-to-Treat^b

Trial 9 ^c77 [64, 86] (n = 64) 69 [57, 79] (n = 80) 43 [31, 56] (n = 67) 37 [27, 48] (n = 84)

Trial 10 ^c78 [67, 88] (n = 65) 73 [61, 82] (n = 77) 41 [29, 54] (n = 68) 36 [26, 47] (n = 84)

Trial 11 ^c90 [80, 96] (n = 69) 83 [74, 91] (n = 84) 33 [24, 44] (n = 93) 32 [23, 42] (n = 99)

^a Patients were included in the analysis if they had confirmed duodenal ulcer disease (active ulcer trials 9 and 10; history of ulcer within 5 years, trial 11) and H. pylori infection at baseline defined as at least two of three positive endoscopic tests from CLOtest^®, histology, and/or culture. Patients were included in the analysis if they completed the trial. Additionally, if patients dropped out of the trial due to an adverse reaction related to the study drug, they were included in the analysis as failures of therapy. The impact of eradication on ulcer recurrence has not been assessed in patients with a past history of ulcer. ^b Patients were included in the analysis if they had documented H. pylori infection at baseline and had confirmed duodenal ulcer disease. All dropouts were included as failures of therapy. c p < 0.05 versus clarithromycin tablets plus amoxicillin.

Clarithromycin tablets + Omeprazole Therapy

Four randomized, double-blind, multi-center trials (trials 12, 13, 14, and 15) evaluated clarithromycin tablets 500 mg three times a day plus omeprazole 40 mg once a day for 14 days, followed by omeprazole 20 mg once a day (trials 12, 13, and 15) or by omeprazole 40 mg once a day (trial 14) for an additional 14 days in patients with active duodenal ulcer associated with H. pylori. Trials 12 and 13 were conducted in the U.S. and Canada and enrolled 242 and 256 patients, respectively. H. pylori infection and duodenal ulcer were confirmed in 219 patients in trial 12 and 228 patients in trial 13. These trials compared the combination regimen to omeprazole and clarithromycin tablets monotherapies. Trials 14 and 15were conducted in Europe and enrolled 154 and 215 patients, respectively. H. pylori infection and duodenal ulcer were confirmed in 148 patients in trial 14 and 208 patients in trial 15. These trials compared the combination regimen to omeprazole monotherapy. The results for the efficacy analyses for these trials are described in Tables 20, 21, and 22.

Duodenal Ulcer Healing

The combination of clarithromycin tablets and omeprazole was as effective as omeprazole alone for healing duodenal ulcer (see Table 20).

Table 20. End-of-Treatment Ulcer Healing Rates Percent of Patients Healed (n/N)

Trial Clarithromycin Tablets + Omeprazole Omeprazole Clarithromycin Tablets

U.S. Trials

Trial 13 94% (58/62)^a 88% (60/68) 71% (49/69)

Trial 12 88% (56/64)^a 85% (55/65) 64% (44/69)

Non-U.S. Trials

Trial 15 99% (84/85) 95% (82/86) N/A

Trial 14^b 100% (64/64) 99% (71/72) N/A

^a p < 0.05 for clarithromycin tablets + omeprazole versus clarithromycin tablets monotherapy. ^b In trial 14 patients received omeprazole 40 mg daily for days 15 to 28.

Eradication of H. pylori Associated with Duodenal Ulcer

The combination of clarithromycin tablets and omeprazole was effective in eradicating H. pylori (see Table 21). H. pylori eradication was defined as no positive test (culture or histology) at 4 weeks following the end of treatment, and two negative tests were required to be considered eradicated. In the per-protocol analysis, the following patients were excluded: dropouts, patients with major protocol violations, patients with missing H. pylori tests post-treatment, and patients that were not assessed for H. pylori eradication at 4 weeks after the end of treatment because they were found to have an unhealed ulcer at the end of treatment.

Table 21. H. pylori Eradication Rates (Per-Protocol Analysis) at 4 to 6 weeks Percent of Patients Cured (n/N)

Trial Clarithromycin Tablets + Omeprazole Omeprazole Clarithromycin Tablets

U.S. Trials

Trial 13 64% (39/61)^a,b 0% (0/59) 39% (17/44)

Trial 12 74% (39/53)^a,b 0% (0/54) 31% (13/42)

Non-U.S. Trials

Trial 15 74% (64/86)^b 1% (1/90) N/A

Trial 14 83% (50/60)^b 1% (1/74) N/A

^a Statistically significantly higher than clarithromycin tablets monotherapy (p < 0.05). ^b Statistically significantly higher than omeprazole monotherapy (p < 0.05).

Duodenal Ulcer Recurrence

Ulcer recurrence at 6-months and at 12 months following the end of treatment was assessed for patients in whom ulcers were healed post-treatment (see the results in Table 22). Thus, in patients with duodenal ulcer associated with H. pylori infection, eradication of H. pylori reduced ulcer recurrence.

Table 22. Duodenal Ulcer Recurrence at 6 months and 12 months in Patients with Healed Ulcers

H. pylori Negative at 4 to 6 Weeks H. pylori Positive at 4 to 6 Weeks

U.S. Trials Recurrence at 6 Months

Trial 100

Clarithromycin tablets + Omeprazole 6% (2/34) 56% (9/16)

Omeprazole (0/0) 71% (35/49)

Clarithromycin tablets 12% (2/17) 32% (7/22)

Trial 067

Clarithromycin tablets + Omeprazole 38% (11/29) 50% (6/12)

Omeprazole (0/0) 67% (31/46)

Clarithromycin tablets 18% (2/11) 52% (14/27)

Non-U.S. Trials Recurrence at 6 Months

Trial 058

Clarithromycin tablets + Omeprazole 6% (3/53) 24% (4/17)

Omeprazole 0% (0/3) 55% (39/71)

Trial 812b

Clarithromycin tablets + Omeprazole 5% (2/42) 0% (0/7)

Omeprazole 0% (0/1) 54% (32/59)

Non-U.S. Trials Recurrence at 12-Months in Trial 14

Clarithromycin tablets + Omeprazole 3% (1/40) 0% (0/6)

Omeprazole 0% (0/1) 67% (29/43)

15 References

Winkel P, Hilden J, Hansen JF, Kastrup J, Kolmos HJ, KjØller E, et al. Clarithromycin for stable coronary heart disease increases all-cause and cardiovascular mortality and cerebrovascular morbidity over 10 years in the CLARICOR randomised, blinded clinical trial. Int J Cardiol 2015;182:459-65.

Kemper CA, et al. Treatment of Mycobacterium avium Complex Bacteremia in AIDS with a Four-Drug Oral Regimen. Ann Intern Med. 1992;116:466-472.

16 How Supplied/storage And Handling

Clarithromycin tablets, USP 250 mg are supplied as white oval film-coated tablets debossed with W954 on one side and other side plain.

Bottles of 60 Tablets (NDC 64679-954-01)

Clarithromycin tablets, USP 500 mg are supplied as white oval film-coated tablets debossed with W949 on one side and other side plain.

Bottles of 60 Tablets (NDC 64679-949-01)

Store at 20° to 25°C (68° to 77°F) [See USP Controlled Room Temperature]. Dispense in a light, light-resistant container as defined in the USP.

17 Patient Counseling Information

Provide the following instructions or information about clarithromycin tablets to patients:

Counsel patients that antibacterial drugs including clarithromycin should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When clarithromycin tablets are prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by clarithromycin tablets or other antibacterial drugs in the future.

Advise patients that diarrhea is a common problem caused by antibacterials including clarithromycin which usually ends when the antibacterial is discontinued. Sometimes after starting treatment with antibacterials, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibacterial. If this occurs, instruct patients to contact their healthcare provider as soon as possible.

Advise patients that clarithromycin may interact with some drugs; therefore, advise patients to report to their healthcare provider the use of any other medications.

Advise patients that clarithromycin can be taken with or without food and can be taken with milk.

There are no data on the effect of clarithromycin on the ability to drive or use machines. However, counsel patients regarding the potential for dizziness, vertigo, confusion and disorientation, which may occur with the medication. The potential for these adverse reactions should be taken into account before patients drive or use machines.

Advise patients that if pregnancy occurs while taking this drug, there is a potential hazard to the fetus [see Warnings and Precautions (5.7) and Use in Specific Populations (8.1)] .

Advise patients who have coronary artery disease to continue medications and lifestyle modifications for their coronary artery disease because clarithromycin tablets may be associated with increased risk for mortality years after the end of clarithromycin tablets treatment.

Prilosec^® is a registered trademark of AstraZeneca

Prevacid^® is a registered trademark of Tap Pharma

Manufactured by:

Wockhardt Limited

L-1, M.I.D.C., Jalgaon Road,

Aurangabad, Maharashtra,

India.

Distributed by

Wockhardt USA LLC.

20 Waterview Blvd.

Parsippany, NJ 07054

USA.

Rev.080518

Package Label.principal Display Panel

DRUG: Clarithromycin

GENERIC: Clarithromycin

DOSAGE: Film-coated Tablets

ADMINSTRATION: Oral

NDC: 64679-954-01

STRENGTH: 250 mg

NDC: 64679-954-01

STRENGTH: 250 mg

COLOR: WHITE

SHAPE: OVAL

SCORE: no score

SIZE: 15mm

IMPRINT: W954

QTY: 60 Tablets
DRUG: Clarithromycin

GENERIC: Clarithromycin

DOSAGE: Film-coated Tablets

ADMINSTRATION: Oral

NDC: 64679-949-01

STRENGTH: 500 mg

COLOR: WHITE

SHAPE: OVAL

SCORE: no score

SIZE: 19mm

IMPRINT: W949

QTY: 60 Tablets

Table 4. Incidence Rates (%) of Selected Adverse Reactions^ain Immunocompromised Adult Patients Receiving Prophylaxis Against M. avium Complex
Body System^b	Clarithromycin Tablets	Placebo
Adverse Reaction	(n=339) %	(n=339) %
Body as a Whole
Abdominal pain	5%	4%
Headache	3%	1%
Digestive
Diarrhea	8%	4%
Dyspepsia	4%	3%
Flatulence	2%	1%
Nausea	11%	7%
Vomiting	6%	3%
Skin & Appendages
Rash	3%	4%
Special Senses
Taste Perversion	8%^c	0.3%
^a Includes those events possibly or probably related to study drug and excludes concurrent conditions ^b 2% or greater Adverse Reaction Incidence Rates for either treatment group ^c Significant higher incidence compared to the placebo-treated group

Table 5. Percentage of Patients^aExceeding Extreme Laboratory Values in Patients Receiving Prophylaxis Against M. avium Complex
		Clarithromycin Tablets 500 mg twice a day	Placebo
WBC Count	<1 x 10⁹/L	2/103 (4%)	0/95
SGOT	>5 x ULN^b	7/196 (4%)	5/208 (2%)
SGPT	>5 x ULN^b	6/217 (3%)	4/232 (2%)
^a Includes only patients with baseline values within the normal range or borderline high (hematology variables) and within normal range or borderline low (chemistry variables) ^b ULN= Upper Limit of Normal

Table 6. Selected Treatment-Related^aAdverse Reaction Incidence Rates (%) in Immunocompromised Adult Patients During the First 12 Weeks of Therapy with 500 mg Twice a Day ClarithromycinDose
Adverse Reaction	Trial 1 (n=53)	Trial 2 (n=255)	Combined (n=308)
Abdominal Pain	8	2	3
Diarrhea	9	2	3
Flatulence	8	0	1
Headache	8	0	2
Nausea	28	9	12
Rash	9	2	3
Taste Perversion	19	0	4
Vomiting	25	4	8
a Includes those events possibly or probably related to study drug and excludes concurrent conditions

Table 7. Adverse Reactions with an Incidence of 3% or Greater
Adverse Reaction	Clarithromycin + Omeprazole (n=346) % of Patients	Omeprazole (n=355) % of Patients	Clarithromycin (n=166) % of Patients^a
Taste Perversion	15	1	16
Nausea	5	1	3
Headache	5	6	9
Diarrhea	4	3	7
Vomiting	4	<1	1
Abdominal Pain	3	2	1
Infection	3	4	2
^a Only two of four studies

Table 9. Tissue and Serum Concentrations of Clarithromycin
CONCENTRATION (after 250 mg every 12 hours)
Tissue Type	Tissue (mcg/g)	Serum (mcg/mL)
Tonsil	1.6	0.8
Lung	8.8	1.7

Table 10. Middle Ear Fluid and Serum Concentrations of Clarithromycin and 14-OH-Clarithromycin in Pediatric Patients
CONCENTRATION (after 7.5 mg/kg every 12 hours for 5 doses)
Analyte	Middle Ear Fluid (mcg/mL)	Serum (mcg/mL)
Clarithromycin	2.5	1.7
14-OH Clarithromycin	1.3	0.8

Clarithromycin Tissue Concentrations 2 hours after Dose (mcg/mL)/(mcg/g)
Treatment	N	antrum	fundus	N	Mucus
Clarithromycin	5	10.48 ± 2.01	20.81 ± 7.64	4	4.15 ± 7.74
Clarithromycin + Omeprazole	5	19.96 ± 4.71	24.25 ± 6.37	4	39.29 ± 32.79

Table 13. Mortality Rates at 18 months in Trial 3
	Mortality Rates	Reduction in Mortality Rates on
	Placebo	Clarithromycin Tablets	Clarithromycin Tablets
6 month	9.4%	6.5%	31%
12 month	29.7%	20.5%	31%
18 month	46.4%	37.5%	20%

Table 14. Outcome with the Different Dosing Regimens of Clarithromycin Tablets
Outcome	Clarithromycin Tablets 500 mg twice daily	Clarithromycin Tablets 1000 mg twice daily	Clarithromycin Tablets 2000 mg twice daily
One or more negative blood cultures at any time during acute therapy	61% (30/49)	59% (29/49)	52% (25/48)
Two or more negative blood cultures during acute therapy sustained through study day 84	25% (12/49)	25% (12/49)	8% (4/48)
Death or discontinuation by day 84	23% (11/49)	37% (18/49)	56% (27/48)
Relapse by day 84	14% (7/49)	12% (6/49)	13% (6/48)
Median time to first negative culture (in days)	54	41	29
Median time to first decrease of at least 1 log CFU (in days)	29	16	15
Median time to first positive culture or study discontinuation following the first negative culture (in days)	43	59	43

Table 15. Response Rates for Clinical Signs of MAC During 6 Weeks to 12 Weeks of Treatment
Resolution of Fever	Resolution of Night Sweats
Clarithromycin Tablets twice daily dose (mg)	% ever afebrile	% afebrile 6 weeks or more	Clarithromycin Tablets twice daily dose (mg)	% ever resolving	% resolving 6 weeks or more
500	67%	23%	500	85%	42%
1000	67%	12%	1000	70%	33%
2000	62%	22%	2000	72%	36%

Weight Gain Greater Than 3%	Hemoglobin Increase Greater Than 1 gm
Clarithromycin Tablets twice daily dose (mg)	% ever gaining	% gaining 6 weeks or more	Clarithromycin Tablets twice daily dose (mg)	% ever increasing	% increasing 6 weeks or more
500	33%	14%	500	58%	26%
1000	26%	17%	1000	37%	6%
2000	26%	12%	2000	62%	18%

Table 16. Clinical Success Rates of Otitis Media Treatment by Pathogen
Pathogen	Clinical Success Rates
	Clarithromycin Tablets	Oral Cephalosporin
S. pneumoniae	13/15 (87%)	4/5
H. influenzae^a	10/14 (71%)	3/4
M. catarrhalis	4/5	1/1
S. pyogenes	3/3	0/1
All Pathogens Combined	30/37 (81%)	8/11 (73%)
^a None of the H. influenzae isolated pre-treatment was resistant to clarithromycin tablets; 6% were resistant to the control agent.

Table 17. Clinical Success Rates of Acute Otitis Media Treatment by Pathogen
	Clinical Success Rates
PATHOGEN	Clarithromycin Tablets	Antimicrobial/ Beta-lactamase Inhibitor
S. pneumoniae	43/51 (84%)	55/56 (98%)
H. influenzae ^a	36/45 (80%)	31/33 (94%)
M. catarrhalis	9/10 (90%)	6/6
S. pyogenes	3/3	5/5
All Pathogens Combined	91/109 (83%)	97/100 (97%)
^a Of the H. influenzae isolated pre-treatment, 3% were resistant to clarithromycin tablets and 10% were resistant to the control agent.

Table 19. H. pylori Eradication Rates: % of Patients Cured [95% Confidence Interval]
	Clarithromycin Tablets + omeprazole + amoxicillin	Clarithromycin Tablets + amoxicillin
	Per-Protocol^a	Intent-to-Treat^b	Per-Protocol^a	Intent-to-Treat^b
Trial 9	^c77 [64, 86] (n = 64)	69 [57, 79] (n = 80)	43 [31, 56] (n = 67)	37 [27, 48] (n = 84)
Trial 10	^c78 [67, 88] (n = 65)	73 [61, 82] (n = 77)	41 [29, 54] (n = 68)	36 [26, 47] (n = 84)
Trial 11	^c90 [80, 96] (n = 69)	83 [74, 91] (n = 84)	33 [24, 44] (n = 93)	32 [23, 42] (n = 99)
^a Patients were included in the analysis if they had confirmed duodenal ulcer disease (active ulcer trials 9 and 10; history of ulcer within 5 years, trial 11) and H. pylori infection at baseline defined as at least two of three positive endoscopic tests from CLOtest^®, histology, and/or culture. Patients were included in the analysis if they completed the trial. Additionally, if patients dropped out of the trial due to an adverse reaction related to the study drug, they were included in the analysis as failures of therapy. The impact of eradication on ulcer recurrence has not been assessed in patients with a past history of ulcer. ^b Patients were included in the analysis if they had documented H. pylori infection at baseline and had confirmed duodenal ulcer disease. All dropouts were included as failures of therapy. c p < 0.05 versus clarithromycin tablets plus amoxicillin.

Table 20. End-of-Treatment Ulcer Healing Rates Percent of Patients Healed (n/N)
Trial	Clarithromycin Tablets + Omeprazole	Omeprazole	Clarithromycin Tablets
U.S. Trials
Trial 13	94% (58/62)^a	88% (60/68)	71% (49/69)
Trial 12	88% (56/64)^a	85% (55/65)	64% (44/69)
Non-U.S. Trials
Trial 15	99% (84/85)	95% (82/86)	N/A
Trial 14^b	100% (64/64)	99% (71/72)	N/A
^a p < 0.05 for clarithromycin tablets + omeprazole versus clarithromycin tablets monotherapy. ^b In trial 14 patients received omeprazole 40 mg daily for days 15 to 28.

Table 21. H. pylori Eradication Rates (Per-Protocol Analysis) at 4 to 6 weeks Percent of Patients Cured (n/N)
Trial	Clarithromycin Tablets + Omeprazole	Omeprazole	Clarithromycin Tablets
U.S. Trials
Trial 13	64% (39/61)^a,b	0% (0/59)	39% (17/44)
Trial 12	74% (39/53)^a,b	0% (0/54)	31% (13/42)
Non-U.S. Trials
Trial 15	74% (64/86)^b	1% (1/90)	N/A
Trial 14	83% (50/60)^b	1% (1/74)	N/A
^a Statistically significantly higher than clarithromycin tablets monotherapy (p < 0.05). ^b Statistically significantly higher than omeprazole monotherapy (p < 0.05).

Table 22. Duodenal Ulcer Recurrence at 6 months and 12 months in Patients with Healed Ulcers
	H. pylori Negative at 4 to 6 Weeks	H. pylori Positive at 4 to 6 Weeks
U.S. Trials Recurrence at 6 Months
Trial 100
Clarithromycin tablets + Omeprazole	6% (2/34)	56% (9/16)
Omeprazole	(0/0)	71% (35/49)
Clarithromycin tablets	12% (2/17)	32% (7/22)
Trial 067
Clarithromycin tablets + Omeprazole	38% (11/29)	50% (6/12)
Omeprazole	(0/0)	67% (31/46)
Clarithromycin tablets	18% (2/11)	52% (14/27)
Non-U.S. Trials Recurrence at 6 Months
Trial 058
Clarithromycin tablets + Omeprazole	6% (3/53)	24% (4/17)
Omeprazole	0% (0/3)	55% (39/71)
Trial 812b
Clarithromycin tablets + Omeprazole	5% (2/42)	0% (0/7)
Omeprazole	0% (0/1)	54% (32/59)
Non-U.S. Trials Recurrence at 12-Months in Trial 14
Clarithromycin tablets + Omeprazole	3% (1/40)	0% (0/6)
Omeprazole	0% (0/1)	67% (29/43)

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Drugs That Are Affected By Clarithromycin
Drug(s) with Pharmacokinetics Affected by Clarithromycin	Recommendation	Comments
Antiarrhythmics:

Disopyramide Quinidine Dofetilide Amiodarone Sotalol Procainamide	Not Recommended	Disopyramide, Quinidine : There have been postmarketing reports of torsades de pointes occurring with concurrent use of clarithromycin and quinidine or disopyramide. Electrocardiograms should be monitored for QTc prolongation during coadministration of clarithromycin with these drugs [see Warnings and Precautions (5.3)] . Serum concentrations of these medications should also be monitored. There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with disopyramide and quinidine. There have been postmarketing reports of hypoglycemia with the concomitant administration of clarithromycin and disopyramide. Therefore, blood glucose levels should be monitored during concomitant administration of clarithromycin and disopyramide.
Digoxin	Use With Caution	Digoxin : Digoxin is a substrate for P-glycoprotein (Pgp) and clarithromycin is known to inhibit Pgp. When clarithromycin and digoxin are co-administered, inhibition of Pgp by clarithromycin may lead to increased exposure of digoxin. Elevated digoxin serum concentrations in patients receiving clarithromycin and digoxin concomitantly have been reported in postmarketing surveillance. Some patients have shown clinical signs consistent with digoxin toxicity, including potentially fatal arrhythmias. Monitoring of serum digoxin concentrations should be considered, especially for patients with digoxin concentrations in the upper therapeutic range.
Oral Anticoagulants:

Warfarin	Use With Caution	Oral anticoagulants : Spontaneous reports in the postmarketing period suggest that concomitant administration of clarithromycin and oral anticoagulants may potentiate the effects of the oral anticoagulants. Prothrombin times should be carefully monitored while patients are receiving clarithromycin and oral anticoagulants simultaneously [see Warnings and Precautions (5.4)] .
Antiepileptics:

Carbamazepine	Use With Caution	Carbamazepine : Concomitant administration of single doses of clarithromycin and carbamazepine has been shown to result in increased plasma concentrations of carbamazepine. Blood level monitoring of carbamazepine may be considered. Increased serum concentrations of carbamazepine were observed in clinical trials with clarithromycin. There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with carbamazepine.
Antifungals:

Itraconazole	Use With Caution	Itraconazole : Both clarithromycin and itraconazole are substrates and inhibitors of CYP3A, potentially leading to a bi-directional drug interaction when administered concomitantly (see also Itraconazole under "Drugs That Affect Clarithromycin" in the table below). Clarithromycin may increase the plasma concentrations of itraconazole. Patients taking itraconazole and clarithromycin concomitantly should be monitored closely for signs or symptoms of increased or prolonged adverse reactions.
Fluconazole	No Dose Adjustment	Fluconazole : [see Pharmacokinetics (12.3)]
Anti-Gout Agents:

Colchicine (in patients with renal or hepatic impairment) Colchicine (in patients with normal renal and hepatic function)	Contraindicated Use With Caution	Colchicine : Colchicine is a substrate for both CYP3A and the efflux transporter, P-glycoprotein (Pgp). Clarithromycin and other macrolides are known to inhibit CYP3A and Pgp. The dose of colchicine should be reduced when co-administered with clarithromycin in patients with normal renal and hepatic function [see Contraindications (4.4) and Warnings and Precautions (5.4)] .
Antipsychotics:

Pimozide	Contraindicated	Pimozide : [See Contraindications (4.2)]

Quetiapine		Quetiapine : Quetiapine is a substrate for CYP3A4, which is inhibited by clarithromycin. Co-administration with clarithromycin could result in increased quetiapine exposure and possible quetiapine related toxicities. There have been postmarketing reports of somnolence, orthostatic hypotension, altered state of consciousness, neuroleptic malignant syndrome, and QT prolongation during concomitant administration. Refer to quetiapine prescribing information for recommendations on dose reduction if co-administered with CYP3A4 inhibitors such as clarithromycin.
Antispasmodics:

Tolterodine (patients deficient in CYP2D6 activity)	Use With Caution	Tolterodine : The primary route of metabolism for tolterodine is via CYP2D6. However, in a subset of the population devoid of CYP2D6, the identified pathway of metabolism is via CYP3A. In this population subset, inhibition of CYP3A results in significantly higher serum concentrations of tolterodine. Tolterodine 1 mg twice daily is recommended in patients deficient in CYP2D6 activity (poor metabolizers) when co-administered with clarithromycin.
Antivirals:

Atazanavir	Use With Caution	Atazanavir : Both clarithromycin and atazanavir are substrates and inhibitors of CYP3A, and there is evidence of a bi-directional drug interaction (see Atazanavir under "Drugs That Affect Clarithromycin" in the table below) [see Pharmacokinetics (12.3)] .

Saquinavir (in patients with decreased renal function)		Saquinavir : Both clarithromycin and saquinavir are substrates and inhibitors of CYP3A and there is evidence of a bi-directional drug interaction (see Saquinavir under "Drugs That Affect Clarithromycin" in the table below) [see Pharmacokinetics (12.3)] .

Ritonavir Etravirine		Ritonavir, Etravirine : (see Ritonavir and Etravirine under "Drugs That Affect Clarithromycin" in the table below) [see Pharmacokinetics (12.3)] .

Maraviroc		Maraviroc : Clarithromycin may result in increases in maraviroc exposures by inhibition of CYP3A metabolism. See Selzentry^® prescribing information for dose recommendation when given with strong CYP3A inhibitors such as clarithromycin.

Boceprevir (in patients with normal renal function) Didanosine	No Dose Adjustment	Boceprevir : Both clarithromycin and boceprevir are substrates and inhibitors of CYP3A, potentially leading to a bi-directional drug interaction when co-administered. No dose adjustments are necessary for patients with normal renal function (see Victrelis^® prescribing information).

Zidovudine		Zidovudine : Simultaneous oral administration of clarithromycin immediate-release tablets and zidovudine to HIV-infected adult patients may result in decreased steady-state zidovudine concentrations. Administration of clarithromycin and zidovudine should be separated by at least two hours [see Pharmacokinetics (12.3)] .

		The impact of co-administration of clarithromycin extended-release tablets or granules and zidovudine has not been evaluated.
Calcium Channel Blockers:

Verapamil	Use With Caution	Verapamil : Hypotension, bradyarrhythmias, and lactic acidosis have been observed in patients receiving concurrent verapamil, [see Warnings and Precautions (5.4)] .

Amlodipine Diltiazem		Amlodipine, Diltiazem : [See Warnings and Precautions (5.4)]

Nifedipine		Nifedipine : Nifedipine is a substrate for CYP3A. Clarithromycin and other macrolides are known to inhibit CYP3A. There is potential of CYP3A-mediated interaction between nifedipine and clarithromycin. Hypotension and peripheral edema were observed when clarithromycin was taken concomitantly with nifedipine [see Warnings and Precautions (5.4)] .
Ergot Alkaloids:

Ergotamine Dihydroergotamine	Contraindicated	Ergotamine, Dihydroergotamine : Postmarketing reports indicate that coadministration of clarithromycin with ergotamine or dihydroergotamine has been associated with acute ergot toxicity characterized by vasospasm and ischemia of the extremities and other tissues including the central nervous system [see Contraindications (4.6)] .
Gastroprokinetic Agents:

Cisapride	Contraindicated	Cisapride : [See Contraindications (4.2)]
HMG-CoA Reductase Inhibitors:

Lovastatin Simvastatin	Contraindicated	Lovastatin, Simvastatin, Atorvastatin, Pravastatin, Fluvastatin : [See Contraindications (4.5) and Warnings and Precautions (5.4)]

Atorvastatin Pravastatin	Use With Caution

Fluvastatin	No Dose Adjustment
Hypoglycemic Agents:

Nateglinide Pioglitazone Repaglinide Rosiglitazone	Use With Caution	Nateglinide, Pioglitazone, Repaglinide, Rosiglitazone : [See Warnings and Precautions (5.4) and Adverse Reactions (6.2)]

Insulin		Insulin : [See Warnings and Precautions (5.4) and Adverse Reactions (6.2)]
Immunosuppressants :

Cyclosporine	Use With Caution	Cyclosporine : There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with cyclosporine.

Tacrolimus		Tacrolimus : There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with tacrolimus.
Phosphodiesterase inhibitors:

Sildenafil Tadalafil Vardenafil	Use With Caution	Sildenafil, Tadalafil, Vardenafil : Each of these phosphodiesterase inhibitors is primarily metabolized by CYP3A, and CYP3A will be inhibited by concomitant administration of clarithromycin. Co-administration of clarithromycin with sildenafil, tadalafil, or vardenafil will result in increased exposure of these phosphodiesterase inhibitors. Co-administration of these phosphodiesterase inhibitors with clarithromycin is not recommended. Increased systemic exposure of these drugs may occur with clarithromycin; reduction of dosage for phosphodiesterase inhibitors should be considered (see their respective prescribing information).
Proton Pump Inhibitors:

Omeprazole	No Dose Adjustment	Omeprazole : The mean 24-hour gastric pH value was 5.2 when omeprazole was administered alone and 5.7 when coadministered with clarithromycin as a result of increased omeprazole exposures [see Pharmacokinetics (12.3)] (see also Omeprazole under "Drugs That Affect Clarithromycin" in the table below).
Xanthine Derivatives:

Theophylline	Use With Caution	Theophylline : Clarithromycin use in patients who are receiving theophylline may be associated with an increase of serum theophylline concentrations [see Pharmacokinetics (12.3)] . Monitoring of serum theophylline concentrations should be considered for patients receiving high doses of theophylline or with baseline concentrations in the upper therapeutic range.
Triazolobenzodiazepines and Other Related Benzodiazepines:

Midazolam	Use With Caution	Midazolam : When oral midazolam is co-administered with clarithromycin, dose adjustments may be necessary and possible prolongation and intensity of effect should be anticipated [see Warnings and Precautions (5.4) and Pharmacokinetics (12.3)] .

Alprazolam Triazolam		Triazolam, Alprazolam : Caution and appropriate dose adjustments should be considered when triazolam or alprazolam is co-administered with clarithromycin. There have been postmarketing reports of drug interactions and central nervous system (CNS) effects (e.g., somnolence and confusion) with the concomitant use of clarithromycin and triazolam. Monitoring the patient for increased CNS pharmacological effects is suggested. In postmarketing experience, erythromycin has been reported to decrease the clearance of triazolam and midazolam, and thus, may increase the pharmacologic effect of these benzodiazepines.

Temazepam Nitrazepam Lorazepam	No Dose Adjustment	Temazepam, Nitrazepam, Lorazepam : For benzodiazepines which are not metabolized by CYP3A (e.g., temazepam, nitrazepam, lorazepam), a clinically important interaction with clarithromycin is unlikely.

Cytochrome P450 Inducers:

Rifabutin	Use With Caution	Rifabutin : Concomitant administration of rifabutin and clarithromycin resulted in an increase in rifabutin, and decrease in clarithromycin serum levels together with an increased risk of uveitis (see Rifabutin under "Drugs That Affect Clarithromycin" in the table below).
Other Drugs Metabolized by CYP3A:

Alfentanil Bromocriptine Cilostazol Methylprednisole Vinblastine Phenobarbital St. John's Wort	Use With Caution	There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with alfentanil, methylprednisolone, cilostazol, bromocriptine, vinblastine, phenobarbital, and St. John's Wort.
Other Drugs Metabolized by CYP450 Isoforms Other than CYP3A:

Hexobarbital Phenytoin Valproate	Use With Caution	There have been postmarketing reports of interactions of clarithromycin with drugs not thought to be metabolized by CYP3A, including hexobarbital, phenytoin, and valproate.
Drugs that Affect Clarithromycin
Drug(s) that Affect the Pharmacokinetics of Clarithromycin	Recommendation	Comments
Antifungals:

Itraconazole	Use With Caution	Itraconazole : Itraconazole may increase the plasma concentrations of clarithromycin. Patients taking itraconazole and clarithromycin concomitantly should be monitored closely for signs or symptoms of increased or prolonged adverse reactions (see also Itraconazole under "Drugs That Are Affected By Clarithromycin" in the table above).
Antivirals:

Atazanavir	Use With Caution	Atazanavir: When clarithromycin is co-administered with atazanavir, the dose of clarithromycin should be decreased by 50% [see Clinical Pharmacology (12.3)] . Since concentrations of 14-OH clarithromycin are significantly reduced when clarithromycin is co-administered with atazanavir, alternative antibacterial therapy should be considered for indications other than infections due to Mycobacterium avium complex. Doses of clarithromycin greater than 1000 mg per day should not be co-administered with protease inhibitors.

Ritonavir (in patients with decreased renal function)		Ritonavir : Since concentrations of 14-OH clarithromycin are significantly reduced when clarithromycin is co-administered with ritonavir, alternative antibacterial therapy should be considered for indications other than infections due to Mycobacterium avium [see Pharmacokinetics (12.3)] . Doses of clarithromycin greater than 1000 mg per day should not be co-administered with protease inhibitors.

Saquinavir (in patients with decreased renal function)		Saquinavir : When saquinavir is co-administered with ritonavir, consideration should be given to the potential effects of ritonavir on clarithromycin (refer to ritonavir above) [see Pharmacokinetics (12.3)] .
Etravirine		Etravirine : Clarithromycin exposure was decreased by etravirine; however, concentrations of the active metabolite, 14-OH-clarithromycin, were increased. Because 14-OH-clarithromycin has reduced activity against Mycobacterium avium complex (MAC), overall activity against this pathogen may be altered; therefore alternatives to clarithromycin should be considered for the treatment of MAC.

Saquinavir (in patients with normal renal function) Ritonavir (in patients with normal renal function)	No Dose Adjustment
Proton Pump Inhibitors:

Omeprazole	Use With Caution	Omeprazole : Clarithromycin concentrations in the gastric tissue and mucus were also increased by concomitant administration of omeprazole [see Pharmacokinetics (12.3)] .
Miscellaneous Cytochrome P450 Inducers:

Efavirenz Nevirapine Rifampicin Rifabutin Rifapentine	Use With Caution	Inducers of CYP3A enzymes, such as efavirenz, nevirapine, rifampicin, rifabutin, and rifapentine will increase the metabolism of clarithromycin, thus decreasing plasma concentrations of clarithromycin, while increasing those of 14-OH-clarithromycin. Since the microbiological activities of clarithromycin and 14-OH-clarithromycin are different for different bacteria, the intended therapeutic effect could be impaired during concomitant administration of clarithromycin and enzyme inducers. Alternative antibacterial treatment should be considered when treating patients receiving inducers of CYP3A. There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with rifabutin (see Rifabutin under "Drugs That Are Affected By Clarithromycin" in the table above).

Trial	Duration	Triple Therapy Evaluable Analysis^a	Triple Therapy Intent-to-Treat Analysis^b
Trial 6	14 days	92^c [80 to 97.7] (n = 48)	86^c [73.3 to 93.5] (n = 55)
Trial 7	14 days	86^d [75.7 to 93.6] (n = 66)	83^d [72 to 90.8] (n = 70)
Trial 8^e	14 days	85 [77 to 91] (N = 113)	82 [73.9 to 88.1] (N = 126)
	10 days	84 [76 to 89.8] (N = 123)	81 [73.9 to 87.6] (N = 135)
^a Based on evaluable patients with confirmed duodenal ulcer (active or within one year) and H. pylori infection at baseline defined as at least two of three positive endoscopic tests from CLOtest (Delta West LTD., Bentley, Australia), histology, and/or culture. Patients were included in the analysis if they completed the trial. Additionally, if patients were dropped out of the trial due to an adverse reaction related to the drug, they were included in the analysis as evaluable failures of therapy. ^b Patients were included in the analysis if they had documented H. pylori infection at baseline as defined above and had a confirmed duodenal ulcer (active or within one year). All dropouts were included as failures of therapy. ^c (p < 0.05) versus clarithromycin tablets/lansoprazole and lansoprazole/amoxicillin dual therapy. ^d (p < 0.05) versus clarithromycin tablets/amoxicillin dual therapy. ^e The 95% confidence interval for the difference in eradication rates, 10-day minus 14-day, is (10.5, 8.1) in the evaluable analysis and (-9.7, 9.1) in the intent-to-treat analysis

Clarithromycin (clarithromycin 500 mg) Dailymed

Drug Classes

Version History

All Imprints

FDA Adverse Reactions

Recent Major Changes

1 Indications And Usage

1.1 Acute Bacterial Exacerbation of Chronic Bronchitis

1.2 Acute Maxillary Sinusitis

1.3 Community-Acquired Pneumonia

1.4 Pharyngitis/Tonsillitis

1.5 Uncomplicated Skin and Skin Structure Infections

1.6 Acute Otitis Media

1.7 Treatment and Prophylaxis of Disseminated Mycobacterial Infections

1.8 Helicobacter pylori Infection and Duodenal Ulcer Disease

1.9 Limitations of Use

1.10 Usage

2 Dosage And Administration

2.1 Important Administration Instructions

2.2 Adult Dosage

2.3 Combination Dosing Regimens for H. pylori Infection

2.4 Pediatric Dosage

2.5 Dosage Regimens for Mycobacterial Infections

2.6 Dosage Adjustment in Patients with Renal Impairment

2.7 Dosage Adjustment Due to Drug Interactions

3 Dosage Forms And Strengths

4 Contraindications

4.1 Hypersensitivity

4.2 Cardiac Arrhythmias

4.3 Cholestatic Jaundice/Hepatic Dysfunction

4.4 Colchicine

4.5 HMG-CoA Reductase Inhibitors

4.6 Ergot Alkaloids

4.7 Contraindications for Co-administered Drugs

5 Warnings And Precautions

5.1 Acute Hypersensitivity Reactions

5.2 QT Prolongation

5.3 Hepatotoxicity

5.4 Serious Adverse Reactions Due to Concomitant Use with Other Drugs

5.5 All-Cause Mortality in Patients With Coronary Artery Disease 1 to 10 Years After Clarithromycin Exposure

5.6 Clostridium difficile Associated Diarrhea

5.7 Embryofetal Toxicity

5.8 Exacerbation of Myasthenia Gravis

5.9 Development of Drug Resistant Bacteria

6 Adverse Reactions

6.1 Clinical Trials Experience

6.2 Postmarketing Experience

7 Drug Interactions

8 Use In Specific Populations

8.1 Pregnancy

8.3 Nursing Mothers

8.4 Pediatric Use

8.5 Geriatric Use

8.6 Renal and Hepatic Impairment

10 Overdosage

11 Description

12 Clinical Pharmacology

12.1 Mechanism of Action

12.3 Pharmacokinetics

12.4 Microbiology

13 Nonclinical Toxicology

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

13.2 Animal Toxicology and/or Pharmacology

14 Clinical Studies

14.1 Mycobacterial Infections

14.2 Otitis Media

14.3 H. pylori Eradication to Decrease the Risk of Duodenal Ulcer Recurrence

15 References

16 How Supplied/storage And Handling

17 Patient Counseling Information

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