[The effect of enalapril and prazosin on mild to moderate hypertension in black South Africans].

A double-blind, placebo-controlled clinical trial with a parallel design was conducted on 35 black patients with mild to moderate hypertension. After a 4-week run-in on placebo, baseline values were recorded and only patients with diastolic pressures of 95 - 115 mmHg were admitted to the trial, which lasted 10 weeks. These patients were randomised in three groups, receiving daily initially either 5 mg enalapril, 2 mg prazosin or placebo.