Comparison of isradipine and nifedipine in chronic stable angina.

Isradipine, a new dihydropyridine calcium antagonist, was compared to nifedipine in the treatment of 11 male patients with angina and coronary artery disease in a randomised, double-blind cross-over study. Patients received 5 mg nifedipine three times a day rising to 20 mg three times a day in three dosage increments over six weeks or 2.5 mg isradipine three times a day rising to 7.5 mg three times a day in three dosage increments over six weeks, and then received the alternate preparation. There were no significant differences between the drugs in terms of the frequency and severity of angina attacks or the consumption of glyceryl trinitrate. The increases in systolic blood pressure and the double product during exercise were significantly less with isradipine than with nifedipine. There was a similar trend in heart rates. There was no difference between the treatments in respect of exercise induced ST-segment depression or diastolic blood pressure. We conclude that isradipine and nifedipine have similar anti-anginal effects and that isradipine may be a useful new anti-anginal agent.