The efficacy of captopril treatment was compared with that of propranolol in a single-blind crossover study in 14 patients with essential hypertension uncontrolled on diuretic alone. Both captopril (37.5 to 75 mg daily) and propranolol (60 to 120 mg daily), in combination with hydrochlorothiazide (50 mg daily), caused a significant fall in sitting systolic and diastolic blood pressure. Heart rate, plasma renin activity, and plasma aldosterone data were consistent with the effects of converting enzyme inhibition or beta blockade. Both drugs were well tolerated. Captopril appeared to be equivalent in efficacy and safety to propranolol when added to hydrochlorothiazide. It may be considered as an alternative step 2 antihypertensive agent, especially in patients experiencing unwanted effects on beta blockers.
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