Combination therapy in hypertension.

In patients in whom monotherapy does not control blood pressure a second agent is required. Common combinations in clinical practice are a beta-blocker plus a diuretic, an angiotensin converting enzyme (ACE) inhibitor plus a diuretic, a beta-blocker plus a dihydropyridine calcium antagonist, and an ACE inhibitor plus a calcium antagonist. Since both ACE inhibitors and calcium antagonists are metabolically inert and exert favorable effects on target organ disease, their combination is of particular interest. When combined, these two drug classes have additive effects on antihypertensive efficacy, reduction of left ventricular hypertrophy, and protection of the renal circulation. However, whether or not these favorable pathophysiologic changes induced with combination therapy of ACE inhibitors and calcium antagonists will translate into a reduction of morbidity and mortality remains to be documented.