Verapamil Hydrochloride (verapamil hydrochloride 80 mg) Dailymed
Generic: verapamil hydrochloride
IMPRINT: WATSON 343
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COLOR: white SCORE: 2
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verapamil hydrochloride 80 mg - watson 343 round white
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Description
Verapamil hydrochloride is a calcium ion influx inhibitor (slow-channel blocker or calcium ion antagonist) available for oral administration in film-coated tablets containing 40 mg, 80 mg or 120 mg of verapamil hydrochloride. Verapamil hydrochloride is not chemically related to other cardioactive drugs. The structural formula of verapamil hydrochloride is:Benzeneacetonitrile,monohydrochloride, ( Verapamil hydrochloride is a white or practically white, crystalline powder. It is practically odorless and has a bitter taste. It is soluble in water, methanol, and chloroform. The inactive ingredients are anhydrous lactose, corn starch, hypromellose 2910, magnesium stearate, microcrystalline cellulose, polacrilin potassium, and polyethylene glycol 400. In addition the following coloring agents are used: FD&C Yellow No. 6 Aluminum Lake, hydroxypropyl cellulose and titanium dioxide (40 mg light peach, 80 mg light peach and 120 mg peach); hydroxypropyl cellulose and titanium dioxide (40 mg white, 80 mg white and 120 mg white).
Clinical Pharmacology
Verapamil hydrochloride is a calcium ion influx inhibitor (slow-channel blocker or calcium ion antagonist) that exerts its pharmacologic effects by modulating the influx of ionic calcium across the cell membrane of the arterial smooth muscle as well as in conductile and contractile myocardial cells.
Mechanism of action
Angina: The precise mechanism of action of verapamil hydrochloride as an antianginal agent remains to be fully determined, but includes the following two mechanisms: 1. Relaxation and prevention of coronary artery spasm: Verapamil dilates the main coronary arteries and coronary arterioles, both in normal and ischemic regions, and is a potent inhibitor of coronary artery spasm, whether spontaneous or ergonovine-induced. This property increases myocardial oxygen delivery in patients with coronary artery spasm and is responsible for the effectiveness of verapamil in vasospastic (Prinzmetal's or variant) as well as unstable angina at rest. Whether this effect plays any role in classical effort angina is not clear, but studies of exercise tolerance have not shown an increase in the maximum exercise rate-pressure product, a widely accepted measure of oxygen utilization. This suggests that, in general, relief of spasm or dilation of coronary arteries is not an important factor in classical angina. 2. Reduction of oxygen utilization: Verapamil regularly reduces the total peripheral resistance (afterload) against which the heart works both at rest and at a given level of exercise by dilating peripheral arterioles. This unloading of the heart reduces myocardial energy consumption and oxygen requirements and probably accounts for the effectiveness of verapamil in chronic stable effort angina. Arrhythmia: Electrical activity through the AV node depends, to a significant degree, upon calcium influx through the slow channel. By decreasing the influx of calcium, verapamil prolongs the effective refractory period within the AV node and slows AV conduction in a rate-related manner. This property accounts for the ability of verapamil to slow the ventricular rate in patients with chronic atrial flutter or atrial fibrillation. Normal sinus rhythm is usually not affected, but in patients with sick sinus syndrome, verapamil may interfere with sinus-node impulse generation and may induce sinus arrest or sinoatrial block. Atrioventricular block can occur in patients without preexisting conduction defects (see
WARNINGS
). Verapamil decreases the frequency of episodes of paroxysmal supraventricular tachycardia. Verapamil does not alter the normal atrial action potential or intraventricular conduction time, but in depressed atrial fibers it decreases amplitude, velocity of depolarization, and conduction velocity. Verapamil may shorten the antegrade effective refractory period of the accessory bypass tract. Acceleration of ventricular rate and/or ventricular fibrillation has been reported in patients with atrial flutter or atrial fibrillation and a coexisting accessory AV pathway following administration of verapamil (see
WARNINGS
). Verapamil has a local anesthetic action that is 1.6 times that of procaine on an equimolar basis. It is not known whether this action is important at the doses used in man. Essential hypertension: Verapamil exerts antihypertensive effects by decreasing systemic vascular resistance, usually without orthostatic decreases in blood pressure or reflex tachycardia; bradycardia (rate less than 50 beats/min) is uncommon (1.4%). During isometric or dynamic exercise verapamil does not alter systolic cardiac function in patients with normal ventricular function. Verapamil does not alter total serum calcium levels. However, one report suggested that calcium levels above the normal range may alter the therapeutic effect of verapamil.
Pharmacokinetics And Metabolism
PRECAUTIONS After four weeks of oral dosing (120 mg q.i.d.), verapamil and norverapamil levels were noted in the cerebrospinal fluid with estimated partition coefficient of 0.06 for verapamil and 0.04 for norverapamil. Hemodynamics and myocardial metabolism Verapamil reduces afterload and myocardial contractility. Improved left ventricular diastolic function in patients with IHSS and those with coronary heart disease has also been observed with verapamil hydrochloride therapy. In most patients, including those with organic cardiac disease, the negative inotropic action of verapamil is countered by reduction of afterload, and cardiac index is usually not reduced. However, in patients with severe left ventricular dysfunction (e.g., pulmonary wedge pressure above 20 mm Hg or ejection fraction less than 30%), or in patients taking beta-adrenergic blocking agents or other cardiodepressant drugs, deterioration of ventricular function may occur (see Drug interactions). Pulmonary function Verapamil does not induce bronchoconstriction and, hence, does not impair ventilatory function.
Indications & Usage
Verapamil Hydrochloride Tablets are indicated for the treatment of the following: Angina 1. Angina at rest including: Vasospastic (Prinzmetal's variant) angina Unstable (crescendo, pre-infarction) angina 2. Chronic stable angina (classic effort-associated angina) Arrhythmias 1. In association with digitalis for the control of ventricular rate at rest and during stress in patients with chronic atrial flutter and/or atrial fibrillation (see
WARNINGS Accessory Bypass Tract) 2. Prophylaxis of repetitive paroxysmal supraventricular tachycardia Essential Hypertension
Contraindications
Verapamil Hydrochloride Tablets are contraindicated in: 1. Severe left ventricular dysfunction (see
WARNINGS
) 2. Hypotension (systolic pressure less than 90 mm Hg) or cardiogenic shock 3. Sick sinus syndrome (except in patients with a functioning artificial ventricular pacemaker) 4. Second-or-third-degree AV block (except in patients with a functioning artificial ventricular pacemaker) 5. Patients with atrial flutter or atrial fibrillation and an accessory bypass tract (e.g., Wolff-Parkinson-White, Lown-Ganong-Levine syndromes). (see
WARNINGS
) 6. Patients with known hypersensitivity to verapamil hydrochloride.
Warnings
Heart failure
Verapamil has a negative inotropic effect, which in most patients is compensated by its afterload reduction (decreased systemic vascular resistance) properties without a net impairment of ventricular performance. In clinical experience with 4,954 patients, 87 (1.8%) developed congestive heart failure or pulmonary edema. Verapamil should be avoided in patients with severe left ventricular dysfunction (e.g., ejection fraction less than 30%) or moderate to severe symptoms of cardiac failure and in patients with any degree of ventricular dysfunction if they are receiving a beta-adrenergic blocker (see
Drug interactions
). Patients with milder ventricular dysfunction should, if possible, be controlled with optimum doses of digitalis and/or diuretics before verapamil treatment. (Note interactions with digoxin under PRECAUTIONS.)
Hypotension
Occasionally, the pharmacologic action of verapamil may produce a decrease in blood pressure below normal levels, which may result in dizziness or symptomatic hypotension. The incidence of hypotension observed in 4,954 patients enrolled in clinical trials was 2.5%. In hypertensive patients, decreases in blood pressure below normal are unusual. Tilt-table testing (60 degrees) was not able to induce orthostatic hypotension.
Elevated liver enzymes
Accessory bypass tract (Wolff-Parkinson-White or Lown-Ganong-Levine)
Some patients with paroxysmal and/or chronic atrial fibrillation or atrial flutter and a coexisting accessory AV pathway have developed increased antegrade conduction across the accessory pathway bypassing the AV node, producing a very rapid ventricular response or ventricular fibrillation after receiving intravenous verapamil (or digitalis). Although a risk of this occurring with oral verapamil has not been established, such patients receiving oral verapamil may be at risk and its use in these patients is contraindicated (see
CONTRAINDICATIONS
). Treatment is usually DC-cardioversion. Cardioversion has been used safely and effectively after oral verapamil hydrochloride.
Atrioventricular block
The effect of verapamil on AV conduction and the SA mode may cause asymptomatic first-degree AV block and transient bradycardia, sometimes accompanied by nodal escape rhythms. PR-interval prolongation is correlated with verapamil plasma concentrations especially during the early titration phase of therapy. Higher degrees of AV block, however, were infrequently (0.8%) observed. Marked first-degree block or progressive development to second-or-third-degree AV block requires a reduction in dosage or, in rare instances, discontinuation of verapamil hydrochloride and institution of appropriate therapy, depending on the clinical situation.
Patients with hypertrophic cardiomyopathy (IHSS)
Drug interactions
) preceded the severe hypotension in 3 of the 8 patients (2 of whom developed pulmonary edema). Sinus bradycardia occurred in 11% of the patients, second-degree AV block in 4%, and sinus arrest in 2%. It must be appreciated that this group of patients had a serious disease with a high mortality rate. Most adverse effects responded well to dose reduction, and only rarely did verapamil use have to be discontinued.
Precautions
General
OVERDOSAGE
) should be carried out. Use in patients with attenuated (decreased) neuromuscular transmission: It has been reported that verapamil decreases neuromuscular transmission in patients with Duchenne's muscular dystrophy, and that verapamil prolongs recovery from the neuromuscular blocking agent vecuronium. It may be necessary to decrease the dosage of verapamil when it is administered to patients with attenuated neuromuscular transmission. Use in patients with impaired renal function: About 70% of an administered dose of verapamil is excreted as metabolites in the urine. Verapamil is not removed by hemodialysis. Until further data are available, verapamil should be administered cautiously to patients with impaired renal function. These patients should be carefully monitored for abnormal prolongation of the PR interval or other signs of overdosage (see
OVERDOSAGE
).
Drug Interactions
Alcohol: Verapamil may increase blood alcohol concentrations and prolong its effects. Beta-blockers: Controlled studies in small numbers of patients suggest that the concomitant use of verapamil hydrochloride and oral beta-adrenergic blocking agents may be beneficial in certain patients with chronic stable angina or hypertension, but available information is not sufficient to predict with confidence the effects of concurrent treatment in patients with left ventricular dysfunction or cardiac conduction abnormalities. Concomitant therapy with beta-adrenergic blockers and verapamil may result in additive negative effects on heart rate, atrioventricular conduction and/or cardiac contract contractility. In one study involving 15 patients treated with high doses of propranolol (median dose, 480 mg/day; range, 160 to 1,280 mg/day) for severe angina, with preserved left ventricular function (ejection fraction greater than 35%), the hemodynamic effects of additional therapy with verapamil hydrochloride were assessed using invasive methods. The addition of verapamil to high-dose beta-blockers induced modest negative inotropic and chronotropic effects that were not severe enough to limit short-term (48 hours) combination therapy in this study. These modest cardiodepressant effects persisted for greater than 6, but less than 30 hours after abrupt withdrawal of beta-blockers and were closely related to plasma levels of propranolol. The primary verapamil/beta-blocker interaction in this study appeared to be hemodynamic rather than electrophysiologic. In other studies verapamil did not generally induce significant negative inotropic, chronotropic, or dromotropic effects in patients with preserved left ventricular function receiving low or moderate doses of propranolol (less than or equal to 320 mg/day); in some patients, however, combined therapy did produce such effects. Therefore, if combined therapy is used, close surveillance of clinical status should be carried out. Combined therapy should usually be avoided in patients with atrioventricular conduction abnormalities and those with depressed left ventricular function. Asymptomatic bradycardia (36 beats/min) with a wandering atrial pacemaker has been observed in a patient receiving concomitant timolol (a beta-adrenergic blocker) eyedrops and oral verapamil. A decrease in metoprolol and propranolol clearance has been observed when either drug is administered concomitantly with verapamil. A variable effect has been seen when verapamil and atenolol were given together. Digitalis: Clinical use of verapamil in digitalized patients has shown the combination to be well tolerated if digoxin doses are properly adjusted. However, chronic verapamil treatment can increase serum digoxin levels by 50% to 75% during the first week of therapy, and this can result in digitalis toxicity. In patients with hepatic cirrhosis the influence of verapamil on digitoxin kinetics is magnified. Verapamil may reduce total body clearance and extrarenal clearance of digitoxin by 27% and 29% respectively. Maintenance and digitalization doses should be reduced when verapamil is administered, and the patient should be reassessed to avoid over- or underdigitalization. Whenever overdigitalization is suspected, the daily dose of digitalis should be reduced or temporary discontinued. On discontinuation of verapamil hydrochloride use, the patient should be reassessed to avoid underdigitalization. Antihypertensive agents: Verapamil administered concomitantly with oral antihypertensive agents (e.g., vasodilators, angiotensin-converting enzyme inhibitors, diuretics, beta-blockers) will usually have an additive effect on lowering blood pressure. Patients receiving these combinations should be appropriately monitored. Concomitant use of agents that attenuate alpha-adrenergic function with verapamil may result in a reduction in blood pressure that is excessive in some patients. Such an effect was observed in one study following the concomitant administration of verapamil and prazosin. Antiarrhythmic agents: Disopyramide: Until data on possible interactions between verapamil and disopyramide are obtained, disopyramide should not be administered within 48 hours before or 24 hours after verapamil administration. Flecainide: A study in healthy volunteers showed that the concomitant administration of flecainide and verapamil may have additive effects on myocardial contractility, AV conduction, and repolarization. Concomitant therapy with flecainide and verapamil may result in additive negative inotropic effect and prolongation of atrioventricular conduction. Quinidine: In a small number of patients with hypertrophic cardiomyopathy (IHSS) concomitant use of verapamil and quinidine resulted in significant hypotension. Until further data are obtained, combined therapy of verapamil and quinidine in patients with hypertrophic cardiomyopathy should probably be avoided. The electrophysiologic effects of quinidine and verapamil on AV conduction were studied in 8 patients. Verapamil significantly counteracted the effects of quinidine on AV conduction. There has been a report of increased quinidine levels during verapamil therapy. Other: Nitrates: Verapamil has been given concomitantly with short- and long-acting nitrates without any undesirable drug interactions. The pharmacologic profile of both drugs and the clinical experience suggest beneficial interactions. Cimetidine: The interaction between cimetidine and chronically administered verapamil has not been studied. Variable results on clearance have been obtained in acute studies of healthy volunteers; clearance of verapamil was either reduced of unchanged. Lithium: Increased sensitivity to the effects of lithium (neurotoxicity) has been reported during concomitant verapamil-lithium therapy; lithium levels have been observed sometimes to increase, sometimes to decrease, and sometimes to be unchanged. Patients receiving both drugs must be monitored carefully. Carbamazepine: Verapamil therapy may increase carbamazepine concentrations during combined therapy. This may produce carbamazepine side effects such as diplopia, headache, ataxia, or dizziness. Rifampin: Therapy with rifampin may markedly reduce oral verapamil bioavailability. Phenobarbital: Phenobarbital therapy may increase verapamil clearance. Cyclosporin: Verapamil therapy may increase serum levels of cyclosporin. Theophylline: Verapamil may inhibit the clearance and increase the plasma levels of theophylline. Inhalation anesthetics: Animal experiments have shown that inhalation anesthetics depress cardiovascular activity by decreasing the inward movement of calcium ions. When used concomitantly, inhalation anesthetics and calcium antagonists, such as verapamil, should each be titrated carefully to avoid excessive cardiovascular depression. Neuromuscular blocking agents: Clinical data and animal studies suggest that verapamil may potentiate the activity of neuromuscular blocking agents (curare-like and depolarizing). It may be necessary to decrease the dose of verapamil and/or the dose of the neuromuscular blocking agent when the drugs are used concomitantly.
Carcinogenesis & Mutagenesis & Impairment Of Fertility
An 18-month toxicity study in rats, at a low multiple (6-fold) of the maximum recommended human dose, and not the maximum tolerated dose, did not suggest a tumorigenic potential. There was no evidence of a carcinogenic potential of verapamil administered in the diet of rats for two years at doses of 10, 35, and 120 mg/kg/day or approximately 1, 3, 5, and 12 times, respectively, the maximum recommended human daily dose (480 mg/day or 9.6 mg/kg/day). Verapamil was not mutagenic in the Ames test in 5 test strains at 3 mg per plate with or without metabolic activation. Studies in female rats at daily dietary doses up to 5.5 times (55 mg/kg/day) the maximum recommended human dose did not show impaired fertility. Effects on male fertility have not been determined.
Pregnancy
Teratogenic effects: Pregnancy Category C. Reproduction studies have been performed in rabbits and rats at oral doses up to 1.5 (15 mg/kg/day) and 6 (60 mg/kg/day) times the human oral daily dose, respectively, and have revealed no evidence of teratogenicity. In the rat, however, this multiple of the human dose was embryocidal and retarded fetal growth and development, probably because of adverse maternal effects reflected in reduced weight gains of the dams. This oral dose has also been shown to cause hypotension in rats. There are no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Verapamil crosses the placental barrier and can be detected in umbilical vein blood at delivery.
Labor & Delivery
It is not known whether the use of verapamil during labor or delivery has immediate or delayed adverse effects on the fetus, or whether it prolongs the duration of labor or increases the need for forceps delivery or other obstetric intervention. Such adverse experiences have not been reported in the literature, despite a long history of use of verapamil in Europe in the treatment of cardiac side effects of beta-adrenergic agonist agents used to treat premature labor.
Nursing Mothers
Verapamil is excreted in human milk. Because of the potential for adverse reaction in nursing infants from verapamil, nursing should be discontinued while verapamil is administered.
Pediatric Use
Safety and effectiveness in pediatric patients have not been established.
Animal Pharmacology & Or Toxicology
In chronic animal toxicology studies verapamil caused lenticular and/or suture line changes at 30 mg/kg/day or greater, and frank cataracts at 62.5 mg/kg/day or greater in the beagle dog but not in the rat. Development of cataracts due to verapamil has not been reported in man.
Adverse Reactions
Serious adverse reactions are uncommon when verapamil hydrochloride therapy is initiated with upward dose titration within the recommended single and total daily dose. See
WARNINGS
for discussion of heart failure, hypotension, elevated liver enzymes, AV block, and rapid ventricular response. Reversible (upon discontinuation of verapamil) non-obstructive, paralytic ileus has been infrequently reported in association with the use of verapamil. The following reactions to orally administered verapamil occurred at rates greater than 1% or occurred at lower rates but appeared clearly drug-related in clinical trials in 4,954 patients: Constipation7.3%Dyspnea1.4%Dizziness3.3%BradycardiaNausea2.7%(HR<50/min)1.4%Hypotension2.5%AV blockHeadache2.2%total (1231.2%Edema1.9%2and 30.8%CHF,Pulmonary edema1.8%Rash1.2%Fatigue1.7%Flushing0.6%Elevated liver enzymes(see
WARNINGS
)In clinical trials related to the control of ventricular response in digitalized patients who had atrial fibrillation or flutter, ventricular rates below 50 at rest occurred in 15% of patients and asymptomatic hypotension occurred in 5% of patients. The following reactions, reported in 1% or less of patients, occurred under conditions (open trials, marketing experience) where a causal relationship is uncertain; they are uled to alert the physician to a possible relationship: Cardiovascular: angina pectoris, atrioventricular dissociation, chest pain, claudication, myocardial infarction, palpitations, purpura (vasculitis), syncope. Digestive system: diarrhea, dry mouth, gastrointestinal distress, gingival hyperplasia. Hemic and lymphatic: ecchymosis or bruising. Nervous system: cerebrovascular accident, confusion, equilibrium disorders, insomnia, muscle cramps, paresthesia, psychotic symptoms, shakiness, somnolence. Skin: arthralgia and rash, exanthema, hair loss, hyperkeratosis, maculae, sweating, urticaria, Stevens-Johnson syndrome, erythema multiforme. Special senses: blurred vision, tinnitus. Urogenital: gynecomastia, galactorrhea/hyperprolactinemia, increased urination, spotty menstruation, impotence.
Treatment of acute cardiovascular adverse reactions
Overdosage
Treat all verapamil overdoses as serious and maintain observation for at least 48 hours (especially the extended-release formulation), preferably under continuous hospital care. Delayed pharmacodynamic consequences may occur with the extended-release formulation. Verapamil is known to decrease gastrointestinal transit time. Treatment of overdosage should be supportive. Beta-adrenergic stimulation or parenteral administration of calcium injection may increase calcium ion flux across the slow channel, and have been used effectively in treatment of deliberate overdosage with verapamil. In a few reported cases, overdose with calcium channel blockers has been associated with hypotension and bradycardia, initially refractory to atropine but becoming more responsive to this treatment when the patients received large doses (close to 1 gram/hour for more than 24 hours) of calcium chloride. Verapamil cannot be removed by hemodialysis. Clinically significant hypotensive reactions or fixed high-degree AV block should be treated with vasopressor agents or cardiac pacing, respectively. Asystole should be handled by the usual measures, including cardiopulmonary resuscitation.
Dosage & Administration
Angina
Clinical trials show that the usual dose is 80 mg to 120 mg three times a day. However, 40 mg three times a day may be warranted in patients who may have an increased response to verapamil (e.g., decreased hepatic function, elderly, etc.). Upward titration should be based on therapeutic efficacy and safety evaluated approximately eight hours after dosing. Dosage may be increased at daily (e.g., patients with unstable angina) or weekly intervals until optimum clinical response is obtained.
Arrhythmias
The dosage in digitalized patients with chronic atrial fibrillation (see
PRECAUTIONS
) ranges from 240 to 320 mg/day in divided (t.i.d. or q.i.d.) doses. The dosage for prophylaxis of PSVT (non-digitalized patients) ranges from 240 to 480 mg/day in divided (t.i.d. or q.i.d.) doses. In general, maximum effects for any given dosage will be apparent during the first 48 hours of therapy.
Essential Hypertension
Dose should be individualized by titration. The usual initial monotherapy dose in clinical trials was 80 mg three times a day (240 mg/day). Daily dosages of 360 and 480 mg have been used but there is no evidence that dosages beyond 360 mg provided added effect. Consideration should be given to beginning titration at 40 mg three times per day in patients who might respond to lower doses, such as the elderly or people of small stature. The antihypertensive effects of verapamil are evident within the first week of therapy. Upward titration should be based on therapeutic efficacy, assessed at the end of the dosing interval.
How Supplied
Verapamil Hydrochloride Tablets USP, 40 mg white tablets, debossed with WATSON 403 are available in bottles of 100. Verapamil Hydrochloride Tablets USP, 80 mg white, scored tablets, debossed with WATSON 343 are available in bottles of 100, 500, and 1000. Verapamil Hydrochloride Tablets USP, 120 mg white, scored tablets, debossed with WATSON 345 are available in bottles of 100, 500, and 1000. Verapamil Hydrochloride Tablets USP, 40 mg light peach tablets, debossed with WATSON 404 are available in bottles of 100. Verapamil Hydrochloride Tablets USP, 80 mg light peach, scored tablets, debossed with WATSON 344 are available in bottles of 100, 500, and 1000. Verapamil Hydrochloride Tablets USP, 120 mg peach, scored tablets, debossed with WATSON 346 are available in bottles of 100, 500, and 1000.
Storage And Handling
Store at 20(68[See USP controlled room temperature.] Dispense in a tight, light-resistant container with child-resistant closure. Bottles of 100 are supplied with child-resistant closures.
Package Label.principal Display Panel Section
DRUG: Verapamil Hydrochloride GENERIC: Verapamil Hydrochloride DOSAGE: TABLET ADMINSTRATION: ORAL NDC: 49349-459-02 STRENGTH:80 mg COLOR: white SHAPE: ROUND SCORE: Two even pieces SIZE: 9 mm IMPRINT: 30 QTY: 30![]()
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