Adenosine Dailymed
Generic: adenosine is used for the treatment of Atrial Fibrillation Atrial Flutter Heart Block Lung Diseases Sick Sinus Syndrome Tachycardia, Atrioventricular Nodal Reentry Tachycardia, Paroxysmal Wolff-Parkinson-White Syndrome Tachycardia, Ventricular
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1 Indications And Usage
Adenosine, a pharmacologic stress agent, is indicated as an adjunct to thallium-201 myocardial perfusion scintigraphy in patients unable to exercise adequately ( 1 )
Adenosine injection, USP is indicated as an adjunct to thallium-201 myocardial perfusion scintigraphy in patients unable to exercise adequately.
2 Dosage And Administration
Recommended dose is 0.14 mg/kg/min infused over six minutes as a continuous peripheral intravenous infusion (total dose of 0.84 mg/kg) ( 2 )
The recommended adenosine injection dose is 0.14 mg/kg/min infused over six minutes (total dose of 0.84 mg/kg) (Table 1).
- Administer adenosine injection only as a continuous peripheral intravenous infusion
- Inject Thallium-201 at the midpoint of the adenosine injection infusion (i.e., after the first three minutes of adenosine injection)
- Thallium-201 is physically compatible with adenosine injection and may be injected directly into the adenosine injection infusion set
- Inject Thallium-201 as close to the venous access as possible to prevent an inadvertent increase in the dose of adenosine injection (the contents of the intravenous tubing) being administered
Visually inspect adenosine injection for particulate matter and discoloration prior to administration. Do not administer adenosine injection if it contains particulate matter or is discolored.
There are no data on the safety or efficacy of alternative adenosine injection infusion protocols. The safety and efficacy of adenosine injection administered by the intracoronary route have not been established.
Table 1 Dosage Chart for Adenosine Injection Patient Weight (kilograms) Infusion Rate (mL per minute over 6 minutes for total dose of 0.84 mg/kg) 45 2.1 50 2.3 55 2.6 60 2.8 65 3 70 3.3 75 3.5 80 3.8 85 4 90 4.2 The nomogram displayed in Table 1 was derived from the following general formula:
3 Dosage Forms And Strengths
For Injection: 3 mg/mL in single-dose vials ( 3 )
Adenosine injection, USP is supplied as 20 mL and 30 mL single-dose vials containing a sterile, nonpyrogenic, clear solution of adenosine 3 mg/mL.
4 Contraindications
- Second- or third-degree AV block (except in patients with a functioning artificial pacemaker) (
4 )- Sinus node disease, such as sick sinus syndrome or symptomatic bradycardia (except in patients with a functioning artificial pacemaker) (
4 )- Known or suspected bronchoconstrictive or bronchospastic lung disease (e.g., asthma) (
4 )- Known hypersensitivity to adenosine injection (
4 )Adenosine injection is contraindicated in patients with:
- Second- or third-degree AV block (except in patients with a functioning artificial pacemaker) [see Warnings and Precautions (5.2)]
- Sinus node disease, such as sick sinus syndrome or symptomatic bradycardia (except in patients with a functioning artificial pacemaker) [see Warnings and Precautions (5.2)]
- Known or suspected bronchoconstrictive or bronchospastic lung disease (e.g., asthma) [see Warnings and Precautions (5.3)]
- Known hypersensitivity to adenosine [see Warnings and Precautions (5.7)]
5 Warnings And Precautions
- Cardiac Arrest, Ventricular Arrhythmias, and Myocardial Infarction. Fatal cardiac events have occurred. Avoid use in patients with symptoms or signs of acute myocardial ischemia. Appropriate resuscitative measures should be available (
5.1 )- Sinoatrial (SA) and Atrioventricular (AV) Nodal Block. First-, second- or third-degree AV block, or sinus bradycardia can occur. Discontinue adenosine injection if patient develops persistent or symptomatic high-grade AV block (
5.2 )- Bronchoconstriction. Can induce dyspnea, bronchoconstriction, and respiratory compromise, especially in patients with obstructive pulmonary disease. Discontinue adenosine injection if patient develops severe respiratory difficulties (
5.3 )- Hypotension. Significant hypotension can occur. Discontinue adenosine injection if patient develops persistent or symptomatic hypotension (
5.4 )- Cerebrovascular Accidents. Hemorrhagic and ischemic cerebrovascular accidents have occurred (
5.5 )- Seizures. New onset or recurrence of convulsive seizures have occurred. Use of methylxanthines (e.g., caffeine, aminophylline and theophylline) is not recommended in patients who experience a seizures in association with adenosine injection (
5.6 )- Hypersensitivity. Dyspnea, throat tightness, flushing, erythema, rash, and chest discomfort have occurred. Have personnel and resuscitative equipment immediately available (
5.7 )- Atrial Fibrillation. Reported in patients with or without a history of atrial fibrillation (
5.8 )- Hypertension. Clinically significant increases in systolic and diastolic pressure have been observed (
5.9 )5.1 Cardiac Arrest, Ventricular Arrhythmias, and Myocardial Infarction
Fatal and nonfatal cardiac arrest, sustained ventricular tachycardia (requiring resuscitation), and myocardial infarction have occurred following adenosine injection infusion. Avoid use in patients with symptoms or signs of acute myocardial ischemia, for example, unstable angina or cardiovascular instability; these patients may be at greater risk of serious cardiovascular reactions to adenosine injection. Appropriate resuscitative measures should be available [see Overdosage (10)].
5.2 Sinoatrial and Atrioventricular Nodal Block
Adenosine injection exerts a direct depressant effect on the SA and AV nodes and may cause first-, second- or third-degree AV block, or sinus bradycardia. In clinical trials, approximately 6% of patients developed AV block following adenosine injection administration (first-degree heart block developed in 3%, second-degree in 3%, and third-degree in 0.8% of patients) [see Clinical Trials Experience (6.1)].
Use adenosine injection with caution in patients with pre-existing first-degree AV block or bundle branch block. Do not use in patients with high-grade AV block or sinus node dysfunction (except in patients with a functioning artificial pacemaker). Discontinue adenosine injection in any patient who develops persistent or symptomatic high-grade AV block.
5.3 Bronchoconstriction
Adenosine injection administration can cause dyspnea, bronchoconstriction, and respiratory compromise. Adenosine injection should be used with caution in patients with obstructive lung disease not associated with bronchoconstriction (e.g., emphysema, bronchitis). Do not use in patients with bronchoconstriction or bronchospasm (e.g., asthma). Discontinue adenosine injection in any patient who develops severe respiratory difficulties. Resuscitative measures should be available prior to adenosine injection administration [see Clinical Trials Experience (6.1), Overdosage (10), and Clinical Pharmacology (12.2)].
5.4 Hypotension
Adenosine injection is a potent peripheral vasodilator and can induce significant hypotension. The risk of serious hypotension may be higher in patients with autonomic dysfunction, hypovolemia, stenotic valvular heart disease, pericarditis or pericardial effusions, or stenotic carotid artery disease with cerebrovascular insufficiency. Discontinue adenosine injection in any patient who develops persistent or symptomatic hypotension.
5.5 Cerebrovascular Accident
Hemorrhagic and ischemic cerebrovascular accidents have occurred. Hemodynamic effects of adenosine injection including hypotension or hypertension can be associated with these adverse reactions. [seeWarnings and Precautions (5.4) and (5.9)].
5.6 Seizures
New-onset or recurrence of convulsive seizures has occurred following adenosine injection. Some seizures are prolonged and require emergent anticonvulsive management. Aminophylline may increase the risk of seizures associated with adenosine injection. Methylxanthine use is not recommended in patients who experience seizures in association with adenosine injection administration [see Overdosage (10)].
5.7 Hypersensitivity
Dyspnea, throat tightness, flushing, erythema, rash, and chest discomfort have occurred. Symptomatic treatment may be required. Have personnel and appropriate treatment available. Resuscitative measures may be necessary if symptoms progress. [see Post-Marketing Experience (6.2)].
5.8 Atrial Fibrillation
Adenosine injection can cause atrial fibrillation in patients with or without a history of atrial fibrillation. Atrial fibrillation typically began 1.5 to 3 minutes after initiation of adenosine injection, lasted for 15 seconds to 6 hours, and spontaneously converted to normal sinus rhythm [see Post-Marketing Experience (6.2)].
5.9 Hypertension
Adenosine injection can induce clinically significant increases in systolic and diastolic blood pressure. Most increases resolved spontaneously within several minutes, but in some cases, hypertension lasted for several hours [see Clinical Trials Experience (6.1)].
6 Adverse Reactions
Most common adverse reactions (incidence greater than or equal to 10%) are: flushing; chest discomfort; shortness of breath; headache; throat, neck or jaw discomfort; gastrointestinal discomfort; and dizziness ( 6.1 ).
To report SUSPECTED ADVERSE REACTIONS, contact Avet Pharmaceuticals Inc. at 1-866-901-DRUG (3784) or FDA at 1-800-FDA-1088 orwww.fda.gov/medwatch .
The following adverse reactions are discussed in more detail in other sections of the prescribing information:
- Fatal Cardiac Arrest, Ventricular Arrhythmias, and Myocardial Infarction [see Warnings and Precautions (5.1)]
- Sinoatrial and Atrioventricular Nodal Block [seeWarnings and Precautions (5.2)]
- Bronchoconstriction [see Warnings and Precautions (5.3)]
- Hypotension [see Warnings and Precautions (5.4)]
- Cerebrovascular Accident [see Warnings and Precautions (5.5)]
- Seizures [see Warnings and Precautions (5.6)]
- Hypersensitivity [see Warnings and Precautions (5.7)]
- Atrial fibrillation [see Warnings and Precautions (5.8)]
- Hypertension [see Warnings and Precautions (5.9)]
6.1 Clinical Trials Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
The following adverse reactions, with an incidence of at least 1%, were reported with adenosine injection among 1,421 patients in clinical trials. 11% of the adverse reactions occurred several hours after adenosine injection administration. 8% of the adverse reactions began with adenosine injection infusion and persisted for up to 24 hours.
The most common (incidence greater than or equal to 10%) adverse reactions to adenosine injection are flushing, chest discomfort, shortness of breath, headache, throat, neck or jaw discomfort, gastrointestinal discomfort, and dizziness (Table 2).
Table 2 Adverse Reactions in Clinical Trials (Frequency Greater Than or Equal To 1%) Adverse Reactions Adenosine N=1,421 Flushing 44% Chest discomfort 40% Dyspnea 28% Headache 18% Throat, neck or jaw discomfort 15% Gastrointestinal discomfort 13% Lightheadedness/dizziness 12% Upper extremity discomfort 4% ST segment depression 3% First-degree AV block 3% Second-degree AV block 3% Paresthesia 2% Hypotension 2% Nervousness 2% Arrhythmias 1% Adverse reactions to adenosine injection of any severity reported in less than 1% of patients include:
Body as a Whole:                back discomfort, lower extremity discomfort, weakness Cardiovascular System:       myocardial infarction, ventricular arrhythmia, third-degree AV block, bradycardia, palpitation, sinus exit block, sinus pause, T-wave changes, hypertension (systolic blood pressure greater than 200 mm Hg) Respiratory System:  cough Central nervous System: drowsiness, emotional instability, tremors Genital/Urinary System:       Vaginal pressure, urgency Special Senses:                   blurred vision, dry mouth, ear discomfort, metallic taste, nasal congestion, scotomas, tongue discomfort 6.2 Post-Marketing Experience
The following adverse reactions have been reported from marketing experience with adenosine injection. Because these reactions are reported voluntarily from a population of uncertain size, are associated with concomitant diseases and multiple drug therapies and surgical procedures, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Cardiac Disorders:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â cardiac arrest, atrial fibrillation, cardiac failure, myocardial infarction, tachycardia, ventricular arrhythmia Gastrointestinal Disorders:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â nausea and vomiting General Disorders and Administration Site Conditions:Â Â Â Â chest pain, injection site reaction, infusion site pain Immune System Disorders:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â hypersensitivity Nervous System Disorders:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â cerebrovascular accident including intracranial hemorrhage, seizure activity including tonic-clonic (grand mal) seizures, loss of consciousness Respiratory, Thoracic and Mediastinal Disorders: Â Â Â Â Â Â Â Â Â Â Â Â Â bronchospasm, respiratory arrest, throat tightness
7 Drug Interactions
- Methylxanthines interfere with the activity of adenosine (
7.1 ,10 )- Nucleoside transport inhibitors such as dipyridamole can increase the activity of adenosine (
7.1 )7.1 Effects of Other Drugs on Adenosine Injection
- The vasoactive effects of adenosine are inhibited by adenosine receptor antagonists, (such as methylxanthines (e.g., caffeine, aminophylline, and theophylline). The safety and efficacy of adenosine injection in the presence of these agents has not been systematically evaluated [see Overdosage (10)].
- The vasoactive effects of adenosine are potentiated by nucleoside transport inhibitors such as dipyridamole. The safety and efficacy of adenosine in the presence of dipyridamole has not been systematically evaluated.
- Whenever possible, drugs that might inhibit or augment the effects of adenosine should be withheld for at least five half-lives prior to the use of adenosine injection.
7.2 Effects of Adenosine on Other Drugs
Adenosine injection has been given with other cardioactive drugs (such as beta adrenergic blocking agents, cardiac glycosides, and calcium channel blockers) without apparent adverse interactions, but its effectiveness with these agents has not been systematically evaluated. Because of the potential for additive or synergistic depressant effects on the SA and AV nodes, however, adenosine injection should be used with caution in the presence of these agents [see Warnings and Precautions (5.2)].
8 Use In Specific Populations
8.1 Pregnancy
Pregnancy Category C. Animal reproduction studies have not been conducted with adenosine; nor have studies been performed in pregnant women. Because it is not known whether adenosine injection can cause fetal harm when administered to pregnant women, adenosine injection should be used during pregnancy only if clearly needed.
8.3 Nursing Mothers
It is not known whether adenosine is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions from adenosine in nursing infants, the decision to interrupt nursing after administration of adenosine injection or not to administer adenosine, should take into account the importance of the drug to the mother.
8.4 Pediatric Use
The safety and effectiveness of adenosine injection in patients less than 18 years of age have not been established.
8.5 Geriatric Use
Clinical studies with adenosine injection did not include sufficient numbers of subjects aged younger than 65 years to determine whether they respond differently. Other reported experience has not revealed clinically relevant differences of the response of elderly in comparison to younger patients.
10 Overdosage
The half-life of adenosine is less than 10 seconds and adverse reactions of adenosine injection usually resolve quickly when the infusion is discontinued, although delayed or persistent reactions have been observed. Methylxanthines, such as caffeine, aminophylline, and theophylline, are competitive adenosine receptor antagonists and theophylline has been used to terminate persistent adverse reactions. In clinical trials, theophylline (50 to 125 mg slow intravenous injection) was used to attenuate adenosine injection adverse reactions in approximately 2% of patients. Methylxanthine use is not recommended in patients who experience seizures in association with adenosine injection [see Drug Interactions (7.1)].
11 Description
Adenosine is an endogenous nucleoside and is chemically described as 6-amino-9-beta-D-ribofuranosyl-9-H-purine. Adenosine has the following structural formula:
The molecular formula for adenosine is C10H13N5O4 and its molecular weight is 267.24.
Adenosine is a white crystalline powder. It is soluble in water and practically insoluble in alcohol. Solubility increases by warming and lowering the pH of the solution.
Each adenosine injection, USP vial contains a sterile, non-pyrogenic solution of adenosine USP 3 mg/mL and sodium chloride USP 9 mg/mL in water for injection, USP with pH between 4.5 and 7.5.
12 Clinical Pharmacology
12.1 Mechanism of Action
Adenosine causes cardiac vasodilation which increases cardiac blood flow. Adenosine is thought to exert its pharmacological effects through activation of purine receptors (cell-surface A1 and A2 adenosine receptors). Although the exact mechanism by which adenosine receptor activation relaxes vascular smooth muscle is not known, there is evidence to support both inhibition of the slow inward calcium current reducing calcium uptake, and activation of adenylate cyclase through A2 receptors in smooth muscle cells. Adenosine may also lessen vascular tone by modulating sympathetic neurotransmission. The intracellular uptake of adenosine is mediated by a specific transmembrane nucleoside transport system. Once inside the cell, adenosine is rapidly phosphorylated by adenosine kinase to adenosine monophosphate, or deaminated by adenosine deaminase to inosine. These intracellular metabolites of adenosine are not vasoactive.
Myocardial uptake of thallium-201 is directly proportional to coronary blood flow. Since adenosine injection significantly increases blood flow in normal coronary arteries with little or no increase in stenotic arteries, adenosine injection causes relatively less thallium-201 uptake in vascular territories supplied by stenotic coronary arteries i.e., a greater difference is seen after adenosine injection between areas served by normal and areas served by stenotic vessels than is seen prior to adenosine injection.
12.2 Pharmacodynamics
Hemodynamic Effects
Adenosine produces a direct negative chronotropic, dromotropic and inotropic effect on the heart, presumably due to A1 -receptor agonism, and produces peripheral vasodilation, presumably due to A2-receptor agonism. The net effect of adenosine injection in humans is typically a mild to moderate reduction in systolic, diastolic and mean arterial blood pressure associated with a reflex increase in heart rate. Rarely, significant hypotension and tachycardia have been observed [see Warnings and Precautions (5.4)].
12.3 Pharmacokinetics
Distribution
Intravenously administered adenosine distributes from the circulation via cellular uptake, primarily by erythrocytes and vascular endothelial cells. This process involves a specific transmembrane nucleoside carrier system that is reversible, nonconcentrative, and bidirectionally symmetrical.
Metabolism
Intracellular adenosine is metabolized either via phosphorylation to adenosine monophosphate by adenosine kinase, or via deamination to inosine by adenosine deaminase in the cytosol. Since adenosine kinase has a lower Km and Vmax than adenosine deaminase, deamination plays a significant role only when cytosolic adenosine saturates the phosphorylation pathway. Inosine formed by deamination of adenosine can leave the cell intact or can be degraded to hypoxanthine, xanthine, and ultimately uric acid. Adenosine monophosphate formed by phosphorylation of adenosine is incorporated into the high-energy phosphate pool.
Elimination
While extracellular adenosine is primarily cleared from plasma by cellular uptake with a half-life of less than 10 seconds in whole blood, excessive amounts may be deaminated by an ecto-form of adenosine deaminase.
Specific Populations
Renal Impairment
As adenosine does not require renal function for its activation or inactivation, renal impairment would not be expected to alter its effectiveness or tolerability.
Hepatic Impairment
As adenosine does not require hepatic function for its activation or inactivation, hepatic impairment would not be expected to alter its effectiveness or tolerability.
13 Nonclinical Toxicology
13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
Studies in animals have not been performed to evaluate adenosine's carcinogenic potential or potential effects on fertility. Adenosine was negative for genotoxic potential in the Salmonella (Ames Test) and Mammalian Microsome Assay.
Adenosine, however, like other nucleosides at millimolar concentrations present for several doubling times of cells in culture, is known to produce a variety of chromosomal alterations.
14 Clinical Studies
In two crossover comparative studies involving 319 subjects who could exercise (including 106 healthy volunteers and 213 patients with known or suspected coronary disease), adenosine injection and exercise thallium images were compared by blinded observers. The images were concordant for the presence of perfusion defects in 85.5% of cases by global analysis (patient by patient) and up to 93% of cases based on vascular territories.
In the two studies, 193 patients also had recent coronary arteriography for comparison (healthy volunteers were not catheterized). The sensitivity for detecting angiographically significant disease (greater than or equal to 50% reduction in the luminal diameter of at least one major vessel) was 64% for adenosine injection and 64% for exercise testing. The specificity was 54% for adenosine injection and 65% for exercise testing. The 95% confidence limits for adenosine injection sensitivity were 56% to 78% and for specificity were 37% to 71%.
Intracoronary Doppler flow catheter studies have demonstrated that a dose of intravenous adenosine injection of 0.14 mg/kg/min produces maximum coronary hyperemia (relative to intracoronary papaverine) in approximately 95% of cases within two to three minutes of the onset of the infusion. Coronary blood flow velocity returns to basal levels within one to two minutes of discontinuing the adenosine injection infusion.
16 How Supplied/storage And Handling
16.1 How Supplied
Adenosine injection, USP is supplied as 20 mL and 30 mL vials of sterile, nonpyrogenic, preservative-free, solution in normal saline:
60 mg/20 mL (3 mg/mL) in a 20 mL single-dose, glass vial, packaged individually in a carton (NDC 23155-258-31) and in packages of ten (NDC 23155-258-41).
90 mg/30 mL (3 mg/mL) in a 30 mL single-dose, glass vial, packaged individually in a carton (NDC 23155-258-32) and in packages of ten (NDC 23155-258-42).
16.2 Storage and Handling
- Store at 20° to 25°C (68° to 77°F); excursions permitted between 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]
- Do not refrigerate as crystallization may occur. If crystallization has occurred, dissolve crystals by warming to room temperature. The solution must be clear at the time of use
- Discard unused portion
17 Patient Counseling Information
- Advise patients that they may be at increased risk of fatal and nonfatal heart attacks, abnormal heart rhythms, cardiac arrest, heart block, significant increase or decrease in blood pressure, bronchoconstriction, hypersensitivity reactions, seizures, or cerebrovascular accidents with the use of adenosine injection [see Warnings and Precautions (5.1 to 5.9)].
- Advise patients with COPD or asthma to discuss their respiratory history with their clinician before scheduling a myocardial perfusion imaging study with adenosine injection [seeWarnings and Precautions (5.3)].
- Methylxanthines have the potential to impact the effects of adenosine injection. Instruct patients to avoid consumption of any products containing methylxanthines, including caffeinated coffee, tea or other caffeinated beverages, caffeine- containing drug products, aminophylline, and theophylline prior to the myocardial perfusion imaging study. Question patients about a history of seizures [seeWarnings and Precautions (5.6), Drug Interactions (7.1), and Overdosage (10)].
Manufactured by:
Emcure Pharmaceuticals Ltd.,
Sanand, Ahmedabad-382110, India.
Manufactured for:
Avet Pharmaceuticals Inc.
East Brunswick, NJ 08816
1.866.901.DRUG (3784)
Revised: 12/2020
Package Label Principal Display Panel - 60 Mg/20 Ml Label
NDC 23155-258-31
ADENOSINE Injection USP
60 mg/20 mL
(3 mg/mL)
For Intravenous Infusion Only
20 mL Single-Dose Vial
Rx only
Package Label Principal Display Panel - 60 Mg/20 Ml Carton
NDC 23155-258-31
ADENOSINE Injection USP
60 mg/20 mL
(3 mg/mL)
For Intravenous Infusion Only
One 20 mL Single-Dose Vial
Rx only
Package Label Principal Display Panel - 90 Mg/30 Ml Label
NDC 23155-258-32
ADENOSINE Injection USP
90 mg/30 mL
(3 mg/mL)
For Intravenous Infusion Only
30 mL Single-Dose Vial
Rx only
Package Label Principal Display Panel - 90 Mg/30 Ml Carton
NDC 23155-258-32
ADENOSINE Injection USP
90 mg/30 mL
(3 mg/mL)
For Intravenous Infusion Only
One 30 mL Single-Dose Vial
Rx only
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