ISOPTIN® 40 mg Film Coated Tablets
(and dosage form):
ISOPTIN® 40 mg Film Coated Tablets
Each film coated tablet contains 40 mg verapamil hydrochloride.
A 7.1.4 Vasodilators - Coronary and other medicines used in Angina pectoris
The calcium antagonist verapamil reduces myocardial oxygen consumption in vitro directly by intervening in the energy consuming metabolic processes of the myocardial cell, and indirectly by diminishing the peripheral resistance (after-load).
It prolongs impulse conduction in the AV node.
Angina pectoris (acute and chronic coronary insufficiency), supraventricular tachydysrhythmia.
Retarded AV conduction (second and third degree AV block), acute stage of myocardial infarction, sick-sinus syndrome.
DOSAGE AND DIRECTIONS FOR USE:
The doses of Isoptin as prescribed by the physician are to be taken regularly, preferably half an hour before meals together with some liquid. The average daily dose is 120 mg - 360 mg in three divided doses where possible.
SIDE EFFECTS AND SPECIAL PRECAUTIONS:
As Isoptin inhibits AV conduction, it may cause AV block. Isoptin may also lead to a transient decrease in blood pressure, even in normotensive patients.
Constipation, headache, fatigue, palpitations, first and second degree AV block, SA block, epigastric pain, flush, dizziness, urticaria and temporary skin rash may occur. Reversible increase of transaminases and/or alkaline phosphatase has been observed and is most probably a response to allergic hepatitis. Reports of individuals experiencing exacerbation of arthritis, increased urination, burning sensations of the gums, mild tremor and severe facial pain are known.
Where heart failure is present, full compensation with cardiac glycosides must be achieved before the administration of Isoptin.
In patients with diminished hepatic function (parenchymal loss/reduced blood supply) the effect of Isoptin is intensified and prolonged, depending on the severity of the disease, due to impaired drug metabolism. In these cases dosage should be adjusted with special care.
In atrial fibrillation and simultaneous WPW syndrome there is a risk of precipitating ventricular fibrillation.
Safety in pregnancy has not been established.
During the simultaneous administration of Isoptin and drugs with cardio-depressive effect and/or inhibiting effect on atrioventricular conduction (e.g. beta-adrenergic blockers), the patient should be observed for additive effects.
Isoptin may intensify the blood pressure lowering effect of antihypertensives, and this makes it often possible to reduce the dose of the antihypertensives particularly in patients on long-term treatment with Isoptin.
Rises in digoxin plasma levels under concomitant administration of Isoptin have been reported. However, extensive experience indicates that this possible interaction is of only slight clinical relevance. Physicians should be alert for symptoms of possible digitalis intoxication.
KNOWN SYMPTOMS OF OVERDOSAGE AND PARTICULARS OF ITS TREATMENT
Cardiac arrest: External cardiac massage, artificial respiration, ECG for differentiating between asystolia and ventricular fibrillation; then appropriate intensive measures, such as defibrillation or pacemaker therapy as required.
Second and third degree AV block: Atropine, isoproterenol, if necessary pacemaker therapy.
Development of myocardial insufficiency: Dopamine, dobutamine, cardiac glycosides or calcium.
Hypotension: Proper positioning, dopamine, dobutamine, norepinephrine.
White, biconvex, film-coated tablets. Embossed with 40on one side and with the Knolltriangle on the other side.
100 tablets of ISOPTIN 40 mg (glass bottles).
Store in a cool (below 25°C) dry place.
KEEP OUT OF REACH OF CHILDREN.
H646 (Act 101/1965).
NAME AND BUSINESS ADDRESS OF THE APPLICANT:
Knoll Pharmaceuticals South Africa (Pty) Ltd
c/o George Road & 16th Street
Midrand, Halfway House 1685
DATE OF PUBLICATION OF THIS PACKAGE INSERT:
21 July 1995
Updated on this site: October 2001
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