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BISOPROLOL FUMARATE AND HYDROCHLOROTHIAZIDE
bisoprolol fumarate and
hydrochlorothiazide tablet, coated
----------Bisoprolol Fumarate and Hydrochlorothiazide Tablets, 2.5 mg/6.25 mg, 5 mg/6.25 mg and 10 mg/6.25 mg
Bisoprolol fumarate and hydrochlorothiazide tablets are indicated for the treatment of hypertension. It combines two antihypertensive agents in a once-daily dosage: a synthetic beta1-selective (cardioselective) adrenoceptor blocking agent (bisoprolol fumarate) and a benzothiadiazine diuretic (hydrochlorothiazide).
Bisoprolol fumarate USP is chemically described as (±)-1-[4-[[2-(1-methylethoxy) ethoxy]methyl]phenoxy]-3-[(1-methylethyl)amino]-2-propanol(E)-2-butenedioate (2:1) (salt). It possesses an asymmetric carbon atom in its structure and is provided as a racemic mixture. The S(-) enantiomer is responsible for most of the beta-blocking activity. Its molecular formula is (C18H31NO4)2•C4H4O4 and it has a molecular weight of 766.97. Its structural formula is:
Bisoprolol fumarate USP is a white crystalline powder, approximately equally hydrophilic and lipophilic, and readily soluble in water, methanol, ethanol, and chloroform.
Hydrochlorothiazide USP (HCTZ) is 6-Chloro-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide. It is a white, or practically white, practically odorless crystalline powder. It is slightly soluble in water, sparingly soluble in dilute sodium hydroxide solution, freely soluble in n-butylamine and dimethylformamide, sparingly soluble in methanol, and insoluble in ether, chloroform, and dilute mineral acids. Its molecular formula is C7H8CIN3O4S2 and it has a molecular weight of 297.73. Its structural formula is:
Each Bisoprolol Fumarate and Hydrochlorothiazide Tablet, 2.5 mg/6.25 mg for oral administration contains:
Bisoprolol fumarate USP....................................................................................................2.5 mg
Hydrochlorothiazide USP ................................................................................................6.25 mg
Each Bisoprolol Fumarate and Hydrochlorothiazide Tablet, 5 mg/6.25 mg for oral administration contains:
Bisoprolol fumarate USP........................................................................................................5 mg
Hydrochlorothiazide USP..................................................................................................6.25 mg
Each Bisoprolol Fumarate and Hydrochlorothiazide Tablet, 10 mg/6.25 mg for oral administration contains:
Bisoprolol fumarate USP.....................................................................................................10 mg
Hydrochlorothiazide USP.................................................................................................6.25 mg
Inactive ingredients include: colloidal silicon dioxide, corn starch, dibasic calcium phosphate, magnesium stearate, microcrystalline cellulose, hypromellose, titanium dioxide, polyethylene glycol, polysorbate 80. Both the 2.5 mg/6.25 mg and the 5 mg/6.25 mg tablets contain FD&C yellow #6 aluminum lake. In addition, the 5 mg/6.25 mg tablets contain FD&C red #40 aluminium lake.
Bisoprolol fumarate and hydrochlorothiazide have been used individually and in combination for the treatment of hypertension. The antihypertensive effects of these agents are additive; HCTZ 6.25 mg significantly increases the antihypertensive effect of bisoprolol fumarate. The incidence of hypokalemia with the bisoprolol fumarate and hydrochlorothiazide 6.25 mg combination (B/H) is significantly lower than with hydrochlorothiazide 25 mg. In clinical trials of bisoprolol and hydrochlorothiazide, mean changes in serum potassium for patients treated with bisoprolol fumarate and hydrochlorothiazide tablets 2.5 mg/6.25 mg, 5 mg/6.25 mg, 10 mg/6.25 mg or placebo were less than ± 0.1 mEq/L. Mean changes in serum potassium for patients treated with any dose of bisoprolol in combination with hydrochlorothiazide 25 mg ranged from -0.1 mEq/L to -0.3 mEq/L. Bisoprolol fumarate is a beta1-selective (cardioselective) adrenoceptor blocking agent without significant membrane stabilizing or intrinsic sympathomimetic activities in its therapeutic dose range. At higher doses (>20 mg) bisoprolol fumarate USP also inhibits beta2-adreno-receptors located in bronchial and vascular musculature. To retain relative selectivity, it is important to use the lowest effective dose.
Hydrochlorothiazide USP is a benzothiadiazine diuretic. Thiazides affect renal tubular mechanisms of electrolyte reabsorption and increase excretion of sodium and chloride in approximately equivalent amounts. Natriuresis causes a secondary loss of potassium.
Pharmacokinetics and Metabolism
Bisoprolol Fumarate and Hydrochlorothiazide
In healthy volunteers, both bisoprolol fumarate and hydrochlorothiazide are well absorbed following oral administration of bisoprolol fumarate and hydrochlorothiazide tablets. No change is observed in the bioavailability of either agent when given together in a single tablet. Absorption is not affected whether bisoprolol fumarate and hydrochlorothiazide tablets are taken with or without food. Mean peak bisoprolol fumarate plasma concentrations of about 9.0 ng/mL, 19 ng/mL and 36 ng/mL occur approximately 3 hours after the administration of the 2.5 mg/6.25 mg, 5 mg/6.25 mg and 10 mg/6.25 mg combination tablets, respectively. Mean peak plasma hydrochlorothiazide concentrations of 30 ng/mL occur approximately 2.5 hours following the administration of the combination. Dose proportional increases in plasma bisoprolol concentrations are observed between the 2.5 mg and 5 mg, as well as between the 5 mg and 10 mg doses. The elimination T1/2 of bisoprolol ranges from 7 to 15 hours and that of hydrochlorothiazide ranges from 4 to 10 hours. The percent of dose excreted unchanged in urine is about 55% for bisoprolol and about 60% for hydrochlorothiazide.
Bisoprolol Fumarate USP
The absolute bioavailability after a 10 mg oral dose of bisoprolol fumarate USP is about 80%. The first pass metabolism of bisoprolol fumarate is about 20%.
The pharmacokinetic profile of bisoprolol fumarate has been examined following single doses and at steady state. Binding to serum proteins is approximately 30%. Peak plasma concentrations occur within 2 to 4 hours of dosing with 2.5 mg to 20 mg, and mean peak values range from 9.0 ng/mL at 2.5 mg to 70 ng/mL at 20 mg. Once-daily dosing with bisoprolol fumarate results in less than twofold intersubject variation in peak plasma concentrations. Plasma concentrations are proportional to the administered dose in the range of 2.5 mg to 20 mg. The plasma elimination half-life is 9 to 12 hours and is slightly longer in elderly patients, in part because of decreased renal function. Steady state is attained within 5 days with 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 half-life and once-daily dosing. Bisoprolol is eliminated equally by renal and nonrenal pathways with about 50% of the dose appearing unchanged in the urine and the remainder 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. The pharmacokinetic characteristics of the two enantiomers are similar. Bisoprolol is not metabolized by cytochrome P450 ll D6 (debrisoquin hydroxylase). In subjects with creatinine clearance less than 40 mL/min, the plasma half-life is increased approximately threefold compared to healthy subjects.
In patients with liver cirrhosis, the rate of elimination of bisoprolol is more variable and significantly slower than that in healthy subjects, with a plasma half-life ranging from 8 to 22 hours.
In elderly subjects, mean plasma concentrations at steady state are increased, in part attributed to lower creatinine clearance. However, no significant differences in the degree of bisoprolol accumulation is found between young and elderly populations.
Hydrochlorothiazide USP is well absorbed (65% to 75%) following oral administration. Absorption of hydrochlorothiazide USP is reduced in patients with congestive heart failure. Peak plasma concentrations are observed within 1 to 5 hours of dosing, and range from 70 ng/mL to 490 ng/mL following oral doses of 12.5 mg to 100 mg. Plasma concentrations are linearly related to the administered dose. Concentrations of hydrochlorothiazide USP are 1.6 to 1.8 times higher in whole blood than in plasma. Binding to serum proteins has been reported to be approximately 40% to 68%. The plasma elimination half-life has been reported to be 6 to 15 hours. Hydrochlorothiazide USP is eliminated primarily by renal pathways. Following oral doses of 12.5 mg to 100 mg, 55% to 77% of the administered dose appears in urine and greater than 95% of the absorbed dose is excreted in urine as unchanged drug. Plasma concentrations of hydrochlorothiazide USP are increased and the elimination half-life is prolonged in patients with renal disease.
Findings in clinical hemodynamics studies with bisoprolol fumarate are similar to those observed with other beta-blockers. The most prominent effect is the negative chronotropic effect, giving a reduction in resting and exercise heart rate. There is a fall in resting and exercise cardiac output with little observed change in stroke volume, and only a small increase in right atrial pressure, or pulmonary capillary wedge pressure at rest or during exercise. In normal volunteers, bisoprolol fumarate therapy resulted in a reduction of exercise- and isoproterenol-induced tachycardia. The maximal effect occurred within 1 to 4 hours post-dosing. Effects generally persisted for 24 hours at doses of 5 mg or greater. In controlled clinical trials, bisoprolol fumarate given as a single daily dose has been shown to be an effective antihypertensive agent when used alone or concomitantly with thiazide diuretics (see CLINICAL STUDIES).
The mechanism of bisoprolol fumarate's antihypertensive effect has not been completely established. Factors that may be involved include:
1) Decreased cardiac output,
2) Inhibition of renin released by the kidneys,
3) Diminution of tonic sympathetic outflow from vasomotor centers in the brain. Beta1-selectivity of bisoprolol fumarate has been demonstrated in both animal and human studies. No effects at therapeutic doses on beta2-adrenoreceptor density have been observed. Pulmonary function studies have been conducted in healthy volunteers, asthmatics, and patients with chronic obstructive pulmonary disease (COPD). Doses of bisoprolol fumarate ranged from 5 mg to 60 mg, atenolol from 50 mg to 200 mg, metoprolol from 100 mg to 200 mg, and propranolol from 40 mg to 80 mg. In some studies, slight, asymptomatic increases in airway resistance (AWR) and decreases in forced expiratory volume (FEV1) were observed with doses of bisoprolol fumarate USP 20 mg and higher, similar to the small increases in AWR noted with other cardioselective beta-blocking agents. The changes induced by beta-blockade with all agents were reversed by bronchodilator therapy.
Electrophysiology studies in man have demonstrated that bisoprolol fumarate significantly decreases heart rate, increases sinus node recovery time, prolongs AV node refractory periods, and with rapid atrial stimulation, prolongs AV nodal conduction.
Acute effects of thiazides are thought to result from a reduction in blood volume and cardiac output, secondary to a natriuretic effect, although a direct vasodilatory mechanism has also been proposed. With chronic administration, plasma volume returns toward normal, but peripheral vascular resistance is decreased.
Thiazides do not affect normal blood pressure. Onset of action occurs within 2 hours of dosing, peak effect is observed at about 4 hours, and activity persists for up to 24 hours.
In controlled clinical trials, bisoprolol fumarate and hydrochlorothiazide 6.25 mg has been shown to reduce systolic and diastolic blood pressure throughout a 24-hour period when administered once daily. The effects on systolic and diastolic blood pressure reduction of the combination of bisoprolol fumarate and hydrochlorothiazide were additive. Further, treatment effects were consistent across age groups (<60 years, >60 years), racial groups (black, nonblack), and gender (male, female).
In two randomized, double-blind, placebo-controlled trials conducted in the U.S., reductions in systolic and diastolic blood pressure and heart rate 24 hours after dosing in patients with mild-to-moderate hypertension are shown below. In both studies mean systolic/diastolic blood pressure and heart rate at baseline were approximately 151/101 mm Hg and 77 bpm.
Blood pressure responses were seen within 1 week of treatment but the maximum effect was apparent after 2 to 3 weeks of treatment. Overall, significantly greater blood pressure reductions were observed on bisoprolol fumarate and hydrochlorothiazide tablets than on placebo. Further, blood pressure reductions were significantly greater for each of the bisoprolol fumarate plus hydrochlorothiazide combinations than for either of the components used alone regardless of race, age, or gender. There were no significant differences in response between black and nonblack patients.
INDICATIONS AND USAGE
Bisoprolol fumarate and hydrochlorothiazide tablets are indicated in the management of hypertension.
Bisoprolol fumarate and hydrochlorothiazide tablets are contraindicated in patients in cardiogenic shock, overt cardiac failure (see WARNINGS), second or third degree AV block, marked sinus bradycardia, anuria, and hypersensitivity to either component of this product or to other sulfonamide-derived drugs.
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 these agents. In such situations, they must be used cautiously.
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 and hydrochlorothiazide tablets should be considered. In some cases bisoprolol fumarate and hydrochlorothiazide tablets therapy can be continued while heart failure is treated with other drugs.
Abrupt Cessation of Therapy
Exacerbations 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 and hydrochlorothiazide tablets over approximately 1 week with the patient under careful observation. If withdrawal symptoms occur, beta-blocking agent 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.
PATIENTS WITH BRONCHOSPASTIC PULMONARY DISEASE SHOULD, IN GENERAL, NOT RECEIVE BETA-BLOCKERS. Because of the relative beta1-selectivity of bisoprolol, bisoprolol fumarate and hydrochlorothiazide tablets may be used with caution in patients with bronchospastic disease who do not respond to, or who cannot tolerate other antihypertensive treatment. Since beta1-selectivity is not absolute, the lowest possible dose of bisoprolol fumarate and hydrochlorothiazide tablets should be used. A beta2 agonist (bronchodilator) should be made available.
Anesthesia and Major Surgery
If bisoprolol and hydrochlorothiazide treatment is to be continued perioperatively, particular care should be taken when anesthetic agents that depress myocardial function, such as ether, cyclopropane, and trichloroethylene, are used. See OVERDOSAGEfor information on treatment of bradycardia and hypotension.
Diabetes and Hypoglycemia
Beta-blockers may mask some of the manifestations of hypoglycemia, particularly tachycardia. Nonselective beta-blockers may potentiate insulin-induced hypoglycemia and delay recovery of serum glucose levels. Because of its beta1-selectivity, this is less likely with bisoprolol fumarate. However, patients subject to spontaneous hypoglycemia, or diabetic patients receiving insulin or oral hypoglycemic agents, should be cautioned about these possibilities. Also, latent diabetes mellitus may become manifest and diabetic patients given thiazides may require adjustment of their insulin dose. Because of the very low dose of HCTZ employed, this may be less likely with bisoprolol fumarate and hydrochlorothiazide tablets.
Beta-adrenergic blockade may mask clinical signs of hyperthyroidism, such as tachycardia. Abrupt withdrawal of beta-blockade may be followed by an exacerbation of the symptoms of hyperthyroidism or may precipitate thyroid storm.
Cumulative effects of the thiazides may develop in patients with impaired renal function. In such patients, thiazides may precipitate azotemia. In subjects with creatinine clearance less than 40 mL/min, the plasma half-life of bisoprolol fumarate is increased up to threefold, as compared to healthy subjects. If progressive renal impairment becomes apparent, bisoprolol fumarate and hydrochlorothiazide tablets should be discontinued. (See CLINICAL PHARMACOLOGY, Pharmacokinetics and Metabolism.)
Bisoprolol fumarate and hydrochlorothiazide tablets should be used with caution in patients with impaired hepatic function or progressive liver disease. Thiazides may alter fluid and electrolyte balance, which may precipitate hepatic coma. Also, elimination of bisoprolol fumarate is significantly slower in patients with cirrhosis than in healthy subjects. (See CLINICAL PHARMACOLOGY, Pharmacokinetics and Metabolism.)
Electrolyte and Fluid Balance Status
Although the probability of developing hypokalemia is reduced with bisoprolol fumarate and hydrochlorothiazide tablets because of the very low dose of HCTZ employed, periodic determination of serum electrolytes should be performed, and patients should be observed for signs of fluid or electrolyte disturbances, i.e., hyponatremia, hypochloremic alkalosis, hypokalemia and hypomagnesemia. Thiazides have been shown to increase the urinary excretion of magnesium; this may result in hypomagnesemia.
Warning signs or symptoms of fluid and electrolyte imbalance include dryness of mouth, thirst, weakness, lethargy, drowsiness, restlessness, muscle pains or cramps, muscular fatigue, hypotension, oliguria, tachycardia and gastrointestinal disturbances such as nausea and vomiting.
Hypokalemia may develop, especially with brisk diuresis when severe cirrhosis is present, during concomitant use of corticosteroids or adrenocorticotropic hormone (ACTH) or after prolonged therapy. Interference with adequate oral electrolyte intake will also contribute to hypokalemia. Hypokalemia and hypomagnesemia can provoke ventricular arrhythmias or sensitize or exaggerate the response of the heart to the toxic effects of digitalis. Hypokalemia may be avoided or treated by potassium supplementation or increased intake of potassium-rich foods.
Dilutional hyponatremia may occur in edematous patients in hot weather; appropriate therapy is water restriction rather than salt administration, except in rare instances when the hyponatremia is life-threatening. In actual salt depletion, appropriate replacement is the therapy of choice.
Calcium excretion is decreased by thiazides, and pathologic changes in the parathyroid glands, with hypercalcemia and hypophosphatemia, have been observed in a few patients on prolonged thiazide therapy.
Hyperuricemia or acute gout may be precipitated in certain patients receiving thiazide diuretics. Bisoprolol fumarate, alone or in combination with HCTZ, has been associated with increases in uric acid. However, in U.S. clinical trials, the incidence of treatment-related increases in uric acid was higher during therapy with HCTZ 25 mg (25%) than with B/H 6.25 mg (10%). Because of the very low dose of HCTZ employed, hyperuricemia may be less likely with bisoprolol fumarate and hydrochlorothiazide tablets.
Laboratory Test Interactions
Based on reports involving thiazides, bisoprolol fumarate and hydrochlorothiazide tablets may decrease serum levels of protein-bound iodine without signs of thyroid disturbance.
Because it includes a thiazide, bisoprolol fumarate and hydrochlorothiazide tablets should be discontinued before carrying out tests for parathyroid function (see PRECAUTIONS, Parathyroid Disease).
Information For Patients
Patients, especially those with coronary artery disease, should be warned against discontinuing use of bisoprolol and hydrochlorothiazide without a physician’s supervision. Patients should also be advised to consult a physician if any difficulty in breathing occurs, or if they develop other signs or symptoms of congestive heart failure or excessive bradycardia. Patients subject to spontaneous hypoglycemia, or diabetic patients receiving insulin or oral hypoglycemic agents, should be cautioned that beta-blockers may mask some of the manifestations of hypoglycemia, particularly tachycardia, and bisoprolol fumarate should be used with caution.
Patients should know how they react to this medicine before they operate automobiles and machinery or engage in other tasks requiring alertness. Patients should be advised that photosensitivity reactions have been reported with thiazides.
Bisoprolol fumarate and hydrochlorothiazide tablets may potentiate the action of other antihypertensive agents used concomitantly. Bisoprolol fumarate and hydrochlorothiazide tablets should not be combined with other beta-blocking agents. Patients receiving catecholamine-depleting drugs, such as reserpine or guanethidine, should be closely monitored because the added beta-adrenergic blocking action of bisoprolol fumarate may produce excessive reduction of sympathetic activity. In patients receiving concurrent therapy with clonidine, if therapy is to be discontinued, it is suggested that bisoprolol fumarate and hydrochlorothiazide tablets be discontinued for several days before the withdrawal of clonidine.
Bisoprolol fumarate and hydrochlorothiazide tablets should be used with caution when myocardial depressants or inhibitors of AV conduction, such as certain calcium antagonists (particularly of the phenylalkylamine [verapamil] and benzothiazepine [diltiazem] classes), or antiarrhythmic agents, such as disopyramide, are used concurrently.
Both digitalis glycosides and beta-blockers slow atrioventricular conduction and decrease heart rate. Concomitant use can increase the risk of bradycardia.
Concurrent use of rifampin increases the metabolic clearance of bisoprolol fumarate shortening its elimination half-life. However, initial dose modification is generally not necessary. Pharmacokinetic studies document no clinically relevant interactions with other agents given concomitantly, including thiazide diuretics and cimetidine. There was no effect of bisoprolol fumarate on prothrombin times in patients on stable doses of warfarin.
While taking beta-blockers, patients with a history of severe anaphylactic reaction to a variety of allergens may be more reactive to repeated challenge, either accidental, diagnostic or therapeutic. Such patients may be unresponsive to the usual doses of epinephrine used to treat allergic reactions.
When given concurrently the following drugs may interact with thiazide diuretics.
Alcohol, barbiturates or narcotics: potentiation of orthostatic hypotension may occur.
Antidiabetic drugs (oral agents and insulin): dosage adjustment of the antidiabetic drug may be required.
Other antihypertensive drugs: additive effect or potentiation.
Cholestyramine and colestipol resins: Absorption of hydrochlorothiazide USP is impaired in the presence of anionic exchange resins. Single doses of cholestyramine and colestipol resins bind the hydrochlorothiazide USP and reduce its absorption in the gastrointestinal tract by up to 85 percent and 43 percent, respectively.
Corticosteroids, ACTH: Intensified electrolyte depletion, particularly hypokalemia.
Pressor amines (e.g., norepinephrine): possible decreased response to pressor amines but not sufficient to preclude their use.
Skeletal muscle relaxants, nondepolarizing (e.g., tubocurarine): possible increased responsiveness to the muscle relaxant.
Lithium: generally should not be given with diuretics. Diuretic agents reduce the renal clearance of lithium and add a high risk of lithium toxicity. Refer to the package insert for lithium preparations before use of such preparations with bisoprolol fumarate and hydrochlorothiazide tablets.
Nonsteroidal anti-inflammatory drugs: In some patients, the administration of a nonsteroidal anti-inflammatory agent can reduce the diuretic, natriuretic, and antihypertensive effects of loop, potassium sparing and thiazide diuretics. Therefore, when bisoprolol fumarate and hydrochlorothiazide tablets and non-steroidal anti-inflammatory agents are used concomitantly, the patient should be observed closely to determine if the desired effect of the diuretic is obtained.
In patients receiving thiazides, sensitivity reactions may occur with or without a history of allergy or bronchial asthma. Photosensitivity reactions and possible exacerbation or activation of systemic lupus erythematosus have been reported in patients receiving thiazides. The antihypertensive effects of thiazides may be enhanced in the post-sympathectomy patient.
Bisoprolol Fumarate and Hydrochlorothiazide
Long-term studies have not been conducted with the bisoprolol fumarate and hydrochlorothiazide combination.
Bisoprolol Fumarate USP
Long-term studies were conducted with oral bisoprolol fumarate administered in the feed of mice (20 and 24 months) and rats (26 months). No evidence of carcinogenic potential was seen in mice dosed up to 250 mg/kg/day or rats dosed up to 125 mg/kg/day. On a body-weight basis, these doses are 625 and 312 times, respectively, the maximum recommended human dose (MRHD) of 20 mg, or 0.4 mg/kg/day, based on 50 kg individuals; on a body-surface-area basis, these doses are 59 times (mice) and 64 times (rats) the MRHD.
Two-year feeding studies in mice and rats, conducted under the auspices of the National Toxicology Program (NTP), treated mice and rats with doses of hydrochlorothiazide USP up to 600 mg/kg/day and 100 mg/kg/day, respectively. On a body-weight basis, these doses are 2,400 times (in mice) and 400 times (in rats) the MRHD of hydrochlorothiazide USP (12.5 mg/day) in bisoprolol fumarate and hydrochlorothiazide. On a body-surface-area basis, these doses are 226 times (in mice) and 82 times (in rats) the MRHD. These studies uncovered no evidence of carcinogenic potential of hydrochlorothiazide USP in rats or female mice, but there was equivocal evidence of hepatocarcinogenicity in male mice.
Bisoprolol Fumarate and Hydrochlorothiazide
The mutagenic potential of the bisoprolol fumarate and hydrochlorothiazide combination was evaluated in the microbial mutagenicity (Ames) test, the point mutation and chromosomal aberration assays in Chinese hamster V79 cells, and the micronucleus test in mice. There was no evidence of mutagenic potential in these in vitro and in vivo assays.
Bisoprolol Fumarate USP
The mutagenic potential of bisoprolol fumarate was evaluated in the microbial mutagenicity (Ames) test, the point mutation and chromosome aberration assays in Chinese hamster V79 cells, the unscheduled DNA synthesis test, the micronucleus test in mice, and the cytogenetics assay in rats. There was no evidence of mutagenic potential in these in vitro and in vivo assays.
Hydrochlorothiazide USP was not genotoxic in in vitro assays using strains TA 98, TA 100, TA 1535, TA 1537 and TA 1538 of Salmonella typhimurium (the Ames test); in the Chinese Hamster Ovary (CHO) test for chromosomal aberrations; or in in vivo assays using mouse germinal cell chromosomes, Chinese hamster bone marrow chromosomes, and the Drosophila sex-linked recessive lethal trait gene. Positive test results were obtained in the in vitro CHO Sister Chromatid Exchange (clastogenicity) test and in the mouse Lymphoma Cell (mutagenicity) assays, using concentrations of hydrochlorothiazide USP of 43 mcg/mL to 1,300 mcg/mL. Positive test results were also obtained in the Aspergillus nidulans nondisjunction assay, using an unspecified concentration of hydrochlorothiazide USP.
Impairment of Fertility
Bisoprolol Fumarate and Hydrochlorothiazide
Reproduction studies in rats did not show any impairment of fertility with the bisoprolol fumarate and hydrochlorothiazide combination doses containing up to 30 mg/kg/day of bisoprolol fumarate USP in combination with 75 mg/kg/day of hydrochlorothiazide USP. On a body-weight basis, these doses are 75 and 300 times, respectively, the MRHD of bisoprolol fumarate and hydrochlorothiazide. On a body-surface-area basis, these study doses are 15 and 62 times, respectively, MRHD.
Bisoprolol Fumarate USP
Reproduction studies in rats did not show any impairment of fertility at doses up to 150 mg/kg/day of bisoprolol fumarate USP or 375 and 77 times the MRHD on the basis of body-weight and body-surface-area, respectively.
Hydrochlorothiazide USP had no adverse effects on the fertility of mice and rats of either sex in studies wherein these species were exposed, via their diet, to doses of up to 100 mg/kg/day and 4 mg/kg/day, respectively, prior to mating and throughout gestation. Corresponding multiples of maximum recommended human doses are 400 (mice) and 16 (rats) on the basis of body-weight and 38 (mice) and 3.3 (rats) on the basis of body-surface-area.
Teratogenic Effects-Pregnancy Category C
Bisoprolol Fumarate and Hydrochlorothiazide
In rats, the bisoprolol fumarate and hydrochlorothiazide (B/H) combination was not teratogenic at doses up to 51.4 mg/kg/day of bisoprolol fumarate in combination with 128.6 mg/kg/day of hydrochlorothiazide. Bisoprolol fumarate and hydrochlorothiazide doses used in the rat study are, as multiples of the MRHD in the combination, 129 and 514 times greater, respectively, on a body-weight basis, and 26 and 106 times greater, respectively, on the basis of body-surface-area. The drug combination was maternotoxic (decreased body weight and food consumption) at B5.7/H14.3 (mg/kg/day) and higher, and fetotoxic (increased late resorptions) at B17.1/H42.9 (mg/kg/day) and higher. Maternotoxicity was present at 14/57 times the MRHD of B/H, respectively, on a body-weight basis, and 3/12 times the MRHD of B/H doses, respectively, on the basis of body-surface-area. Fetotoxicity was present at 43/172 times the MRHD of B/H, respectively, on a body-weight basis, and 9/35 times the MRHD of B/H doses, respectively, on the basis of body-surface-area. In rabbits, the B/H combination was not teratogenic at doses of B10/H25 (mg/kg/day). Bisoprolol fumarate and hydrochlorothiazide used in the rabbit study were not teratogenic at 25/100 times the B/H MRHD, respectively, on a body-weight basis, and 10/40 times the B/H MRHD, respectively, on the basis of body-surface-area. The drug combination was maternotoxic (decreased body weight) at B1/H2.5 (mg/kg/day) and higher, and fetotoxic (increased resorptions) at B10/H25 (mg/kg/day). The multiples of the MRHD for the B/H combination that were maternotoxic are, respectively, 2.5/10 (on the basis of body-weight) and 1/4 (on the basis of body-surface-area), and for fetotoxicity were, respectively 25/100 (on the basis of body-weight) and 10/40 (on the basis of body-surface-area).
There are no adequate and well-controlled studies with bisoprolol fumarate and hydrochlorothiazide tablets in pregnant women. Bisoprolol fumarate and hydrochlorothiazide should be used during pregnancy only if the potential benefit justifies the risk to the fetus.
Bisoprolol Fumarate USP
In rats, bisoprolol fumarate USP was not teratogenic at doses up to 150 mg/kg/day, which were 375 and 77 times the MRHD on the basis of body-weight and body-surface area, respectively. Bisoprolol fumarate USP was fetotoxic (increased late resorptions) at 50 mg/kg/day and maternotoxic (decreased food intake and body-weight gain) at 150 mg/kg/day. The fetotoxicity in rats occurred at 125 times the MRHD on a body-weight basis and 26 times the MRHD on the basis of body-surface-area. The maternotoxicity occurred at 375 times the MRHD on a body-weight basis and 77 times the MRHD on the basis of body-surface-area. In rabbits, bisoprolol fumarate USP was not teratogenic at doses up to 12.5 mg/kg/day, which is 31 and 12 times the MRHD based on body-weight and body-surface-area, respectively, but was embryolethal (increased early resorptions) at 12.5 mg/kg/day.
Hydrochlorothiazide USP was orally administered to pregnant mice and rats during respective periods of major organogenesis at doses up to 3,000 mg/kg/day and 1,000 mg/kg/day, respectively. At these doses, which are multiples of the MRHD equal to 12,000 for mice and 4,000 for rats, based on body-weight, and equal to 1,129 for mice and 824 for rats, based on body-surface-area, there was no evidence of harm to the fetus. There are, however, 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.
Thiazides cross the placental barrier and appear in the cord blood. The use of thiazides in pregnant women requires that the anticipated benefit be weighed against possible hazards to the fetus. These hazards include fetal or neonatal jaundice, pancreatitis, thrombocytopenia, and possibly other adverse reactions which have occurred in the adult.
Bisoprolol fumarate alone or in combination with HCTZ has not been studied in nursing mothers. Thiazides are excreted in human breast milk. Small amounts of bisoprolol fumarate (< 2% of the dose) have been detected in the milk of lactating rats. Because of the potential for serious adverse reactions in nursing infants, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Safety and effectiveness of bisoprolol fumarate and hydrochlorothiazide tablets in pediatric patients have not been established.
In clinical trials, at least 270 patients treated with bisoprolol fumarate plus HCTZ were 60 years of age or older. HCTZ added significantly to the antihypertensive effect of bisoprolol in elderly hypertensive patients. No overall differences in effectiveness or safety were observed between these patients and younger patients. Other reported clinical experience has not identified differences in responses between the geriatric and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
Bisoprolol Fumarate and Hydrochlorothiazide
Bisoprolol fumarate/H6.25 mg is well tolerated in most patients. Most adverse effects (AEs) have been mild and transient. In more than 65,000 patients treated worldwide with bisoprolol fumarate, occurrences of bronchospasm have been rare. Discontinuation rates for AEs were similar for bisoprolol fumarate/H6.25 mg and placebo-treated patients.
In the United States, 252 patients received bisoprolol fumarate (2.5 mg, 5 mg, 10 mg or 40 mg)/H6.25 mg and 144 patients received placebo in two controlled trials. In Study 1, bisoprolol fumarate 5 mg/H6.25 mg was administered for 4 weeks. In Study 2, bisoprolol fumarate 2.5 mg, 10 mg or 40 mg/H6.25 mg was administered for 12 weeks. All adverse experiences, whether drug related or not, and drug related adverse experiences in patients treated with bisoprolol fumarate 2.5 mg to 10 mg/H6.25 mg, reported during comparable, 4 week treatment periods by at least 2% of bisoprolol fumarate/H6.25 mg-treated patients (plus additional selected adverse experiences) are presented in the following table:
Other adverse experiences that have been reported with the individual components are listed below.
Bisoprolol Fumarate USP
In clinical trials worldwide, or in postmarketing experience, a variety of other AEs, in addition to those listed above, have been reported. While in many cases it is not known whether a causal relationship exists between bisoprolol and these AEs, they are listed to alert the physician to a possible relationship.
Central Nervous System: Unsteadiness, dizziness, vertigo, headache, syncope, paresthesia, hypoesthesia, hyperesthesia, sleep disturbance/vivid dreams, insomnia, somnolence, depression, anxiety/restlessness, decreased concentration/memory.
Cardiovascular: Bradycardia, palpitations and other rhythm disturbances, cold extremities, claudication, hypotension, orthostatic hypotension, chest pain, congestive heart failure, dyspnea on exertion.
Gastrointestinal: Gastric/epigastric/abdominal pain, peptic ulcer, gastritis, dyspepsia, nausea, vomiting, diarrhea, constipation, dry mouth.
Musculoskeletal: Arthralgia, muscle/joint pain, back/neck pain, muscle cramps, twitching/tremor.
Skin: Rash, acne, eczema, psoriasis, skin irritation, pruritus, purpura, flushing, sweating, alopecia, dermatitis, exfoliative dermatitis (very rarely), cutaneous vaculitis.
Special Senses: Visual disturbances, ocular pain/pressure, abnormal lacrimation, tinnitus, decreased hearing, earache, taste abnormalities.
Respiratory: Asthma, bronchospasm, bronchitis, dyspnea, pharyngitis, rhinitis, sinusitis, URI (upper respiratory infection).
Genito-urinary: Decreased libido/impotence, Peyronie’s disease (very rarely), cystitis, renal colic, polyuria.
General: Fatigue, asthenia, chest pain, malaise, edema, weight gain, angioedema.
In addition, a variety of adverse effects have been reported with other beta-adrenergic blocking agents and should be considered potential adverse effects:
Central Nervous System: Reversible mental depression progressing to catatonia, hallucinations, an acute reversible syndrome characterized by disorientation to time and place, emotional lability, slightly clouded sensorium.
Allergic: Fever, combined with aching and sore throat, laryngospasm, and respiratory distress.
Hematologic: Agranulocytosis, thrombocytopenia.
Gastrointestinal: Mesenteric arterial thrombosis and ischemic colitis.
Miscellaneous: The oculomucocutaneous syndrome associated with the beta-blocker practolol has not been reported with bisoprolol fumarate during investigational use or extensive foreign marketing experience.
The following adverse experiences, in addition to those listed in the above table, have been reported with hydrochlorothiazide USP (generally with doses of 25 mg or greater).
Central Nervous System: Vertigo, paresthesia, restlessness.
Cardiovascular: Orthostatic hypotension (may be potentiated by alcohol, barbiturates, or narcotics).
Gastrointestinal: Anorexia, gastric irritation, cramping, constipation, jaundice (intrahepatic cholestatic jaundice), pancreatitis, cholecystitis, sialadenitis, dry mouth.
Musculoskeletal: Muscle spasm.
Hypersensitive Reactions: Purpura, photosensitivity, rash, urticaria, necrotizing angiitis (vasculitis and cutaneous vasculitis), fever, respiratory distress including pneumonitis and pulmonary edema, anaphylactic reactions.
Special Senses: Transient blurred vision, xanthopsia.
Because of the low dose of hydrochlorothiazide in bisoprolol fumarate and hydrochlorothiazide, adverse metabolic effects with bisoprolol fumarate/H6.25 mg are less frequent and of smaller magnitude than with HCTZ 25 mg. Laboratory data on serum potassium from the U.S. placebo-controlled trials are shown in the following table:
Treatment with both beta blockers and thiazide diuretics is associated with increases in uric acid. However, the magnitude of the change in patients treated with B/H 6.25 mg was smaller than in patients treated with HCTZ 25 mg. Mean increases in serum triglycerides were observed in patients treated with bisoprolol fumarate and hydrochlorothiazide 6.25 mg. Total cholesterol was generally unaffected, but small decreases in HDL cholesterol were noted. Other laboratory abnormalities that have been reported with the individual components are listed below.
Bisoprolol Fumarate USP
In clinical trials, the most frequently reported laboratory change was an increase in serum triglycerides, but this was not a consistent finding. Sporadic liver test abnormalities have been reported. In the U.S. controlled trials experience with bisoprolol fumarate treatment for 4 to 12 weeks, the incidence of concomitant elevations in SGOT and SGPT from 1 to 2 times normal was 3.9%, compared to 2.5% for placebo. No patient had concomitant elevations greater than twice normal.
In the long-term, uncontrolled experience with bisoprolol fumarate treatment for 6 to 18 months, the incidence of one or more concomitant elevations in SGOT and SGPT from 1 to 2 times normal was 6.2%. The incidence of multiple occurrences was 1.9%. For concomitant elevations in SGOT and SGPT of greater than twice normal, the incidence was 1.5%. The incidence of multiple occurrences was 0.3%. In many cases these elevations were attributed to underlying disorders, or resolved during continued treatment with bisoprolol fumarate. Other laboratory changes included small increases in uric acid, creatinine, BUN, serum potassium, glucose, and phosphorus and decreases in WBC and platelets. There have been occasional reports of eosinophilia. These were generally not of clinical importance and rarely resulted in discontinuation of bisoprolol fumarate.
As with other beta-blockers, ANA conversions have also been reported on bisoprolol fumarate. About 15% of patients in long-term studies converted to a positive titer, although about one-third of these patients subsequently reconverted to a negative titer while on continued therapy.
Hyperglycemia, glycosuria, hyperuricemia, hypokalemia and other electrolyte imbalances (see PRECAUTIONS), hyperlipidemia, hypercalcemia, leukopenia, agranulocytosis, thrombocytopenia, aplastic anemia and hemolytic anemia have been associated with HCTZ therapy.
There are limited data on overdose with bisoprolol fumarate and hydrochlorothiazide tablets. However, several cases of overdose with bisoprolol fumarate have been reported (maximum: 2,000 mg). Bradycardia and/or hypotension were noted. Sympathomimetic agents were given in some cases, and all patients recovered.
The most frequently observed signs expected with overdosage of a beta-blocker are bradycardia and hypotension. Lethargy is also common, and with severe overdoses, delirium, coma, convulsions, and respiratory arrest have been reported to occur. Congestive heart failure, bronchospasm, and hypoglycemia may occur, particularly in patients with underlying conditions. With thiazide diuretics, acute intoxication is rare. The most prominent feature of overdose is acute loss of fluid and electrolytes. Signs and symptoms include cardiovascular (tachycardia, hypotension, shock), neuromuscular (weakness, confusion, dizziness, cramps of the calf muscles, paresthesia, fatigue, impairment of consciousness), gastrointestinal (nausea, vomiting, thirst), renal (polyuria, oliguria, or anuria [due to hemoconcentration]), and laboratory findings (hypokalemia, hyponatremia, hypochloremia, alkalosis, increased BUN [especially in patients with renal insufficiency]).
If overdosage of bisoprolol fumarate and hydrochlorothiazide tablets is suspected, therapy with bisoprolol and hydrochlorothiazide should be discontinued and the patient observed closely. Treatment is symptomatic and supportive; there is no specific antidote. Limited data suggest bisoprolol fumarate is not dialyzable; similarly, there is no indication that hydrochlorothiazide USP is dialyzable. Suggested general measures include induction of emesis and/or gastric lavage, administration of activated charcoal, respiratory support, correction of fluid and electrolyte imbalance, and treatment of convulsions. Based on the expected pharmacologic actions and recommendations for other beta-blockers and hydrochlorothiazide USP, the following measures should be considered when clinically warranted:
Bradycardia: Administer IV atropine. If the response is inadequate, isoproterenol or another agent with positive chronotropic properties may be given cautiously. Under some circumstances, transvenous pacemaker insertion may be necessary.
Hypotension, Shock: The patient’s legs should be elevated. IV fluids should be administered and lost electrolytes (potassium, sodium) replaced. Intravenous glucagon may be useful. Vasopressors should be considered.
Heart Block (second or third degree): Patients should be carefully monitored and treated with isoproterenol infusion or transvenous cardiac pacemaker insertion, as appropriate.
Congestive Heart Failure: Initiate conventional therapy (i.e., digitalis, diuretics, vasodilating agents, inotropic agents).
Bronchospasm: Administer a bronchodilator such as isoproterenol and/or aminophylline.
Hypoglycemia: Administer IV glucose.
Surveillance: Fluid and electrolyte balance (especially serum potassium) and renal function should be monitored until normalized.
DOSAGE AND ADMINISTRATION
Bisoprolol is an effective treatment of hypertension in once-daily doses of 2.5 mg to 40 mg, while hydrochlorothiazide is effective in doses of 12.5 mg to 50 mg. In clinical trials of bisoprolol/hydrochlorothiazide combination therapy using bisoprolol doses of 2.5 mg to 20 mg and hydrochlorothiazide doses of 6.25 mg to 25 mg, the antihypertensive effects increased with increasing doses of either component.
The adverse effects (see WARNINGS) of bisoprolol are a mixture of dose-dependent phenomena (primarily bradycardia, diarrhea, asthenia and fatigue) and dose-independent phenomena (e.g., occasional rash); those of hydrochlorothiazide are a mixture of dose-dependent phenomena (primarily hypokalemia) and dose-independent phenomena (e.g., possibly pancreatitis); the dose-dependent phenomena for each being much more common than the dose-independent phenomena. The latter consist of those few that are truly idiosyncratic in nature or those that occur with such low frequency that a dose relationship may be difficult to discern. Therapy with a combination of bisoprolol and hydrochlorothiazide will be associated with both sets of dose-independent adverse effects, and to minimize these, it may be appropriate to begin combination therapy only after a patient has failed to achieve the desired effect with monotherapy. On the other hand, regimens that combine low doses of bisoprolol and hydrochlorothiazide should produce minimal dose-dependent adverse effects, e.g., bradycardia, diarrhea, asthenia and fatigue, and minimal dose-dependent adverse metabolic effects, i.e., decreases in serum potassium (see CLINICAL PHARMACOLOGY).
Therapy Guided by Clinical Effect:A patient whose blood pressure is not adequately controlled with 2.5 mg to 20 mg bisoprolol daily may instead be given bisoprolol fumarate and hydrochlorothiazide tablets. Patients whose blood pressures are adequately controlled with 50 mg of hydrochlorothiazide USP daily, but who experience significant potassium loss with this regimen, may achieve similar blood pressure control without electrolyte disturbance if they are switched to bisoprolol fumarate and hydrochlorothiazide tablets.
Initial Therapy:Antihypertensive therapy may be initiated with the lowest dose of bisoprolol fumarate and hydrochlorothiazide tablets, one 2.5 mg/6.25 mg tablet once daily. Subsequent titration (14 day intervals) may be carried out with bisoprolol fumarate and hydrochlorothiazide tablets up to the maximum recommended dose 20 mg/12.5 mg (two 10 mg/6.25 mg tablets) once daily, as appropriate.
Replacement Therapy:The combination may be substituted for the titrated individual components.
Cessation of Therapy:If withdrawal of bisoprolol fumarate and hydrochlorothiazide tablets therapy is planned, it should be achieved gradually over a period of about 2 weeks. Patients should be carefully observed.
Patients with Renal or Hepatic Impairment:As noted in the WARNINGSsection, caution must be used in dosing/titrating patients with hepatic impairment or renal dysfunction. Since there is no indication that hydrochlorothiazide USP is dialyzable, and limited data suggest that bisoprolol is not dialyzable, drug replacement is not necessary in patients undergoing dialysis.
Geriatric Patients:Dosage adjustment on the basis of age is not usually necessary, unless there is also significant renal or hepatic dysfunction (see above and WARNINGSsection).
Pediatric Patients: There is no pediatric experience with bisoprolol fumarate and hydrochlorothiazide tablets.
Bisoprolol fumarate and hydrochlorothiazide tablets are available as:
5 mg/6.25 mg: round, convex, red, film-coated tablets, plain on one side and imprinted "" over "704" on the other side, in bottles of 30, 100 and 500.
10 mg/6.25 mg: round, convex, white, film-coated tablets, plain on one side and imprinted "" over "707" on the other side, in bottles of 30, 100 and 500.
Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].
Princeton, NJ 08540
Rebel Distributors Corp
Thousand Oaks, CA 91320
Revised: 12/2010 Rebel Distributors Corp
Reproduced with permission of U.S. National Library of Medicine
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