'Second generation' dihydropyridine calcium antagonists. Greater vascular selectivity and some unique applications

Drugs
D D Freedman, D D Waters

Abstract

The newer dihydropyridine calcium antagonists are structurally related to nifedipine, but may provide greater vascular selectivity and wider clinical utility. Five new dihydropyridines-nisoldipine, nicardipine, nimodipine, felodipine and nitrendipine-are reviewed with regard to their preclinical pharmacology, haemodynamic effects and clinical indications. Nisoldipine is a potent arterial vasodilator with minimal electrophysiological and negative inotropic effects. Although data are still preliminary, the drug has shown some efficacy in both exertional angina and essential hypertension. The dosing interval is not yet clearly established, but may be twice daily. Utility in congestive heart failure awaits confirmation, but preliminary studies are promising. Nicardipine is an especially potent peripheral, cerebral and coronary arterial vasodilator that causes 10-fold less myocardial depression in animals than nifedipine, and may provide important cardioprotective effects during ischaemia. Human haemodynamic studies have confirmed nicardipine's lack of negative inotropism, its ability to reduce coronary and peripheral vascular resistance, and its lack of effect on cardiac conduction. Several controlled trials have documented its eff...Continue Reading

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