INDICATIONS AND USAGE Bisoprolol fumarate tablets are indicated in the management of hypertension. It may be used alone or in combination with other antihypertensive agents.
CLINICAL PHARMACOLOGY Bisoprolol fumarate tablets are a beta 1 -selective (cardioselective) adrenoceptor blocking agent without significant membrane stabilizing activity or intrinsic sympathomimetic activity in its therapeutic dosage range. Cardioselectivity is not absolute, however, and at higher doses (≥ 20 mg) bisoprolol fumarate also inhibits beta 2 -adrenoceptors, chiefly located in the bronchial and vascular musculature; to retain selectivity it is therefore important to use the lowest effective dose. Pharmacokinetics and Metabolism The absolute bioavailability after a 10 mg oral dose of bisoprolol fumarate is about 80%. Absorption is not affected by the presence of food. The first pass metabolism of bisoprolol fumarate is about 20%. Binding to serum proteins is approximately 30%. Peak plasma concentrations occur within 2-4 hours of dosing with 5 to 20 mg, and mean peak values range from 16 ng/mL at 5 mg to 70 ng/mL at 20 mg. Once daily dosing with bisoprolol fumarate results in less than twofold intersubject variation in peak plasma levels. The plasma elimination half-life is 9-12 hours and is slightly longer in elderly patients, in part because of decreased renal function in that population. Steady state is attained within 5 days of once daily dosing. In both young and elderly populations, plasma accumulation is low; the accumulation factor ranges from 1.1 to 1.3, and is what would be expected from the first order kinetics and once daily dosing. Plasma concentrations are proportional to the administered dose in the range of 5 to 20 mg. Pharmacokinetic characteristics of the two enantiomers are similar. Bisoprolol fumarate is eliminated equally by renal and non-renal pathways with about 50% of the dose appearing unchanged in the urine and the remainder appearing in the form of inactive metabolites. In humans, the known metabolites are labile or have no known pharmacologic activity. Less than 2% of the dose is excreted in the feces. Bisoprolol fumarate is not…
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DOSAGE AND ADMINISTRATION The dose of bisoprolol fumarate tablets must be individualized to the needs of the patient. The usual starting dose is 5 mg once daily. In some patients, 2.5 mg may be an appropriate starting dose (see Bronchospastic Disease in WARNINGS ). If the antihypertensive effect of 5 mg is inadequate, the dose may be increased to 10 mg and then, if necessary, to 20 mg once daily. Patients with Renal or Hepatic Impairment In patients with hepatic impairment (hepatitis or cirrhosis) or renal dysfunction (creatinine clearance less than 40 mL/min), the initial daily dose should be 2.5 mg and caution should be used in dose-titration. Since limited data suggest that bisoprolol fumarate is not dialyzable, drug replacement is not necessary in patients undergoing dialysis. Geriatric Patients It is not necessary to adjust the dose in the elderly, unless there is also significant renal or hepatic dysfunction (see above and Geriatric Use in PRECAUTIONS ). Pediatric Patients There is no pediatric experience with bisoprolol fumarate tablets.
ADVERSE REACTIONS Safety data are available in more than 30,000 patients or volunteers. Frequency estimates and rates of withdrawal of therapy for adverse events were derived from two U.S. placebo-controlled studies. In Study A, doses of 5, 10, and 20 mg bisoprolol fumarate were administered for 4 weeks. In Study B, doses of 2.5, 10, and 40 mg of bisoprolol fumarate were administered for 12 weeks. A total of 273 patients were treated with 5-20 mg of bisoprolol fumarate; 132 received placebo. Withdrawal of therapy for adverse events was 3.3% for patients receiving bisoprolol fumarate and 6.8% for patients on placebo. Withdrawals were less than 1% for either bradycardia or fatigue/lack of energy. The following table presents adverse experiences, whether or not considered drug related, reported in at least 1% of patients in these studies, for all patients studied in placebo-controlled clinical trials (2.5-40 mg), as well as for a subgroup that was treated with doses within the recommended dosage range (5-20 mg). Of the adverse events listed in the table, bradycardia, diarrhea, asthenia, fatigue, and sinusitis appear to be dose related. Body System/Adverse Experience All Adverse Experiences (% a ) Bisoprolol Fumarate Placebo (n=132) % 5-20 mg (n=273) % 2.5-40 mg (n=404) % Skin increased sweating 1.5 0.7 1.0 Musculoskeletal arthralgia 2.3 2.2 2.7 Central Nervous System dizziness 3.8 2.9 3.5 headache 11.4 8.8 10.9 hypoaesthesia 0.8 1.1 1.5 Autonomic Nervous System dry mouth 1.5 0.7 1.3 Heart Rate/Rhythm bradycardia 0 0.4 0.5 Psychiatric vivid dreams 0 0 0 insomnia 2.3 1.5 2.5 depression 0.8 0 0.2 Gastrointestinal diarrhea 1.5 2.6 3.5 nausea 1.5 1.5 2.2 vomiting 0 1.1 1.5 Respiratory bronchospasm 0 0 0 cough 4.5 2.6 2.5 dyspnea 0.8 1.1 1.5 pharyngitis 2.3 2.2 2.2 rhinitis 3.0 2.9 4.0 sinusitis 1.5 2.2 2.2 URI 3.8 4.8 5.0 Body as a Whole asthenia 0 0.4 1.5 chest pain 0.8 1.1 1.5 fatigue 1.5 6.6 8.2 edema (peripheral) 3.8 3.7 3.0 a percentage of patients with event The…
CONTRAINDICATIONS Bisoprolol fumarate tablets are contraindicated in patients with cardiogenic shock, overt cardiac failure, second or third degree AV block, and marked sinus bradycardia.
Other β-blocking Agents : Bisoprolol fumarate should not be combined with other β-blocking agents. Catecholamine-Depleting Drugs : Patients receiving catecholamine-depleting drugs, such as reserpine or guanethidine, should be monitored closely because the added β-adrenergic blocking action of bisoprolol fumarate may produce excessive reduction of sympathetic activity. Centrally Active Antihypertensive Agents : β-blockers may exacerbate the rebound hypertension which can follow the withdrawal of clonidine. If the two drugs are coadministered, the β-blocker should be withdrawn several days before discontinuing clonidine. If replacing clonidine by β-blocker therapy, the introduction of β-blockers should be delayed for several days after clonidine administration has stopped (see also prescribing information for clonidine). Antiarrhythmic Agents : Bisoprolol fumarate should be used with care when myocardial depressants or inhibitors of A-V conduction, such as certain calcium antagonists (particularly of the phenyl alkylamine (verapamil) and benzothiazepine (diltiazem) classes), or antiarrhythmic agents, such as disopyramide, are used concurrently. Calcium Channel Blockers : Combined use of β-blockers and calcium channel blockers with negative inotropic effects can lead to prolongation of S-A and A-V conduction, particularly in patients with impaired ventricular function or conduction abnormalities. This may result in severe hypotension, bradycardia and cardiac failure.
WARNINGS Click here to enter Warnings Cardiac Failure Sympathetic stimulation is a vital component supporting circulatory function in the setting of congestive heart failure, and beta-blockade may result in further depression of myocardial contractility and precipitate more severe failure. In general, beta-blocking agents should be avoided in patients with overt congestive failure. However, in some patients with compensated cardiac failure it may be necessary to utilize them. In such a situation, they must be used cautiously. In Patients Without a History of Cardiac Failure Continued depression of the myocardium with beta-blockers can, in some patients, precipitate cardiac failure. At the first signs or symptoms of heart failure, discontinuation of bisoprolol fumarate tablets should be considered. In some cases, beta-blocker therapy can be continued while heart failure is treated with other drugs. Abrupt Cessation of Therapy Exacerbation of angina pectoris, and, in some instances, myocardial infarction or ventricular arrhythmia, have been observed in patients with coronary artery disease following abrupt cessation of therapy with beta-blockers. Such patients should, therefore, be cautioned against interruption or discontinuation of therapy without the physician’s advice. Even in patients without overt coronary artery disease, it may be advisable to taper therapy with bisoprolol fumarate tablets over approximately one week with the patient under careful observation. If withdrawal symptoms occur, bisoprolol fumarate tablets therapy should be reinstituted, at least temporarily. Peripheral Vascular Disease Beta-blockers can precipitate or aggravate symptoms of arterial insufficiency in patients with peripheral vascular disease. Caution should be exercised in such individuals. Bronchospastic Disease PATIENTS WITH BRONCHOSPASTIC DISEASE SHOULD, IN GENERAL, NOT RECEIVE BETA-BLOCKERS. Because of its relative beta 1 -selectivity, however, bisoprolol fumarate tablets may be…