ZANIDIP is indicated for the treatment of mild to moderate essential hypertension.
The recommended dosage is 10 mg orally once a day at least 15 minutes before meals; the dose may be increased to 20 mg depending on the individual patient's response.
Dose titration should be gradual, because it may take about 2 weeks before the maximal antihypertensive effect is apparent.
Some individuals, not adequately controlled on a single antihypertensive agent, may benefit from the addition of ZANIDIP to therapy with a beta-adrenoceptor blocking drug (atenolol), a diuretic (hydrochlorothiazide) or an angiotensin converting enzyme inhibitor (captopril or enalapril).
Since the dose-response curve is steep with a plateau at doses between 20-30 mg, it is unlikely that efficacy will be improved by higher doses; whereas side effects may increase.