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Apresoline hydrochloride(ß
Apresoline(ß hydrochloride
hydralazine hydrochloride USP
Tablets
Prescribing Information
DESCRIPTION
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Strength Form
1 10: 1 TABLET, COATED (C42897) TABLET, COATED (C42897) TABLET, COATED (C42897) 4 100: 1 TABLET, Acacia, FD&C Yellow No.5, FD&C Yellow No.6, lactose, magnesium stearate, COATED mannitol, polyethylene glycol, sodium starch glycolate, starch, stearic acid _ _ _ _ _ _ _ _ _ _ _ _ ~C_~~J!2 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___
Proprietary name: Established name: Route of administration: Active ingredients (moiety):
2 25: 1
3 50: 1
Apresoline hydrochloride hydralazine hydrochloride ORAL (C38288) hydralazine hydrochloride (hydralazine)
Inactive ingredients Acacia, D&C Yellow No. 10, lactose, magnesium stearate, mannitol, polyethylene glycol, sodium starch glycolate, starch, stearic acid
Acacia, FD&C Blue No.1, lactose, magnesium stearate, mannitol, polyethylene glycol, sodium starch glycolate, starch, stearic acid
Acacia, FD&C Blue No.1, lactose, magnesium stearate, mannitol, polyethylene glycol, sodium starch glycolate, starch, stearic acid
Apresoline, hydralazine hydrochloride USP, is an antihypertensive, available
as 10-, 25-, 50-, and 1 OO-mg tablets for oral administration. Its chemical
name is 1-hydrazinophthalazine monohydrochloride, and its structural formula is:
NHNH /' ./~
r~J..'.~O.......'~N l
. (^) HGI
Hydralazine hydrochloride USP is a white to off-white, odorless crystalline powder. It is soluble in water, slightly soluble in alcohol, and very slightly soluble in ether. It melts at about 275°C, with decomposition, and has a molecular weight of 196.64.
Inactive Ingredients. Acacia, D&C Yellow NO.1 0 (1 O-mg tablets), FD&C Blue NO.1 (25-mg and 50-mg tablets), FD&C Yellow No.5 and FD&C Yellow NO.6 (100-mg tablets), lactose, magnesium stearate, mannitol, polyethylene glycol, sodium starch glycolate, starch, and stearic acid.
CLINICAL PHARMACOLOGY
Although the precise mechanism of action of hydralazine is not fully understood, the major effects are on the cardiovascularsystem. Hydralazine apparently lowers blood pressure by exerting a peripheral vasodilating effect through a direct relaxation of vascular smooth muscle. Hydralazine, by altering cellular calcium metabolism, interferes with the calcium movements within the vascular smooth muscle that are responsible for initiating or maintaining the contractile state. The peripheral vasodilating effect of hydralazine results in decreased arterial blood pressure (diastolic more than systolic); decreased peripheral
vascular resistance; and an increased heart rate, stroke volume, and cardiac
output. The preferential dilatation of arterioles, as compared to veins, minimizes postural hypotension and promotes the increase in cardiac output. Hydralazine usually increases renin activity in plasma, presumably as a result of increased secretion of renin by the renal juxtaglomerular cells in response to reflex sympathetic discharge. This increase in renin activity leads to the production of angiotensin II, which then causes stimulation of aldosterone and consequent sodium reabsorption. Hydralazine also maintains or increases renal and cerebral blood flow. Hydralazine is rapidly absorbed after oral administration, and peak plasma levels are reached at 1-2 hours. Plasma levels of apparent hydralazine decline with a half-life of 3-7 hours. Binding to human plasma protein is 87% Plasma levels of hydralazine vary widely among (^) individuals. Hydralazine is subject to polymorphic acetylation; slow acetylators generally have higher plasma levels of hydralazine and require lower doses to maintain colilrölolölöoa pressure. Hydralazine undergoes extensive hepatic metabolism; it is excreted mainly in the form of metabolites in the urine.
INDICATIONS AND USAGE
Essential hypertension, alone or as an adjunct.
CONTRAINDICATIONS
Hypersensitivity to hydralazine; coronary artery disease; mitral valvular rheumatic heart disease.
WARNINGS
In a few patients hydralazine may produce a clinical picture simulating systemic lupus erythematosus including glomerulonephritis. In such patients hydralazine should be discontinued unless the benefit-to-risk determination requires continued antihypertensive therapy with this drug. Symptoms and
signs usually regress when the drug is discontinued but residua have been
detected many years later. Long-term treatment with steroids may be
from antihypertensive therapy with hydralazine. Blood dyscrasias, consisting of reduction in hemoglobin and red cell count, leukopenia, agranulocytosis, and purpura have been reported. If such abnormalities develop, therapy should be discontinued.
Drug/Drug Interactions
MAO inhibitors should be used with caution in patients receiving hydralazine. When other potent parenteral antihypertensive drugs, such as diazoxide, are used in combination with hydralazine, patients should be continuously observed for several hours for any excessive fall in blood pressure. Profound hypotensive episodes may occur when diazoxide injection and Apresoline are used concomitantly.
Drug/Food Interactions
Administration of hydralazine with food results in higher plasma levels.
Carcinogenesis, Mutagenesis, Impairment Of Fertility
In a lifetime study in Swiss albino mice, there was a statistically significant increase in the incidence of lung tumors (adenomas and adenocarcinomas) of both male and female mice given hydralazine continuously in their drinking water at a dosage of about 250 mg/kg per day (about 80 times the maximum recommended human dose). In a 2-year carcinogenicity study of rats given hydralazine by gavage at dose levels of 15, 30, and 60 mg/kg/day (approximately 5 to 20 times the recommended human daily dosage), microscopic examination of the liver revealed a small, but statistically significant, increase in benign neoplastic nodules in male and female rats from the high-dose group and in female rats from the intermediate-dose group. Benign interstitial cell tumors of the testes were also significantly increased in male rats from the high-dose group. The tumors observed are common in aged rats and a significantly increased incidence was not observed until 18 months of treatment, Hydralazine was shown to be mutagenic in bacterial systems (Gene Mutation and DNA Repair) and in one of two rat and one rabbit hepatocyte in vitro DNA repair studies. Additional in vivo and in vitro studies using lymphoma cells, germinal cells, and fibroblasts from mice, bone marrow cells from Chinese hamsters and fibroblasts from human cell lines did not demonstrate any mutagenic potential for
hydralazine.
The extent to which these findings indicate a risk to man is uncertain. While long-term clinical observation has not suggested that human cancer is associated with hydralazine use, epidemiologic studies have so far been insufficient to arrive at any conclusions.
Pregnancy Category C
Animal studies indicate that hydralazine is teratogenic in mice at 20-30 times the maximum daily human dose of 200-300 mg and possibly in rabbits (^) at 10- 15 times the maximum daily human dose, but that it is nonteratogenic in
rats. Teratogenic effects observed were cleft palate and malformations of
facial and cranial bones.
There are no adequate and well-controlled studies in pregnant women. Although clinical experience does not include any positive evidence of adverse effects on the human fetus, hydralazine should be used during pregnancy only if the expected benefit justifies the potential risk to the fetus.
Nursing Mothers
Hydralazine has been shown to be excreted in breast milk.
Pediatric Use
Safety and effectiveness in pediatric patients have not been established in controlled clinical trials, although there is experience with the use of Apresoline in these patients. The usual recommended oral starting dosagé is 0.75 mg/kg of body weight daily in four divided doses. Dosage may be increased gradually over the next 3-4 weeks to a maximum of 7.5 mg/kg or 200 mg daily.
ADVERSE REACTIONS
Adverse reactions with Apresoline are usually reversible when dosage is
reduced. However, in some cases it may be necessary to discontinue the
drug. The following adverse reactions have been observed, but there has not been enough systematic collection of data to support an estimate of their
frequency.
Common
Headache, anorexia, nausea, vomiting, diarrhea, palpitations, tachycardia, angina pectoris.
Less Frequent
Digestive: Constipation, Paralytic Ileus.
Cardiovascular. Hypotension, Paradoxical Pressor Response, Edema..
Respiratory Dyspnea.
Neurologic. Peripheral Neuritis Evidenced By Paresthesia, Numbness, And Tingling, Dizziness: Tremors; Muscle Cramps; Psychotic Reactions
. Characterized By Depression, Disorientation, Or Anxiety.
Genitourinary: Difficulty In Urination.
Initiate therapy in gradually increasing dosages; adjust according to individual response. Start with 10 mg four times daily for the first 2-4 days, increase to 25 mg four times daily for the balance of the first week. For the second and subsequent weeks, increase dosage to 50 mg four times daily. For maintenance, adjust dosage to the lowest effective levels. The incidence of toxic reactions, particularly the L.E. cell syndrome, is high in the group of patients receiving large doses of Apresoline. In a few resistant patients, up to 300 mg of Apresoline daily may be required for a significant antihypertensive effect. In such cases, a lower dosage of Apresoline combined with a thiazide and/or reserpine or a beta blocker may be considered. However, when combining therapy, individual titration is essential to ensure the lowest possible therapeutic dose of each drug.
HOW SUPPLIED
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# Name Strength Dosage Form Appearance Package Type Package NDC
Qty 1 Apresoline 10: 1 TABLET, COATED BOTTLE 100: 1 0083-. hydrochloride (C42897) (C43169) 0037- 2 Apresoline 25: 1 TABLET, COATED BOTTLE 100: 1 0083- hydrochloride (C42897) (C43169) 0039- 3 Apresoline 50: 1 TABLET, COATED BOTTLE 100: 1 0083- hydrochloride (C42897) (C43169) 0073- 4 Apresoline 100: 1 TABLET, COATED BOTTLE 100: 1 0083- _ _ _ ~J3~~~~~~~: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ~~~~~~7) _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ~~~~~ ~~ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~~OJ~~~ _ __
Tab/ets 10 mg - round, pale yellow, dry-coated (imprinted CIBA 37) Bottes of 100 ........................... N DC 0083-0037- Tablets 25 mg - round, deep blue, dry-coated (imprinted CIBA 39) Bottes of 100 ............;.............. N DC 0083-0039- Tablets 50 mg - round, light blue, dry-coated (imprinted CIBA 73) Bottles of 100 ........................... N DC 0083-0073-
Tablets 100 mg - round, peach, dry-coated (imprinted CIBA 101)
Bottles of 100 ........................... N DC 0083-0101- Samples, when available, are identified by the word SAMPLE appearing on each tablet.
Do not store above 86°F (30 C). Dispense in tight, light-resistant container (USP).
CI BA
Ciba-Geigy Corporation
C95-14 (Rev. 5/95)
Pharmaceuticals Division
Summit, New Jersey 07901
