Effect of timolol plus hydrochlorothiazide plus hydralazine on essential hypertension.

The effect on hypertension of hydrochlorothiazide 100 mg daily plus timolol 20-60 mg daily versus hydrochlorothiazide plus placebo and of hydrochlorothiazide plus timolol plus hydralazine 40-200 mg daily versus hydrochlorothiazide plus placebo plus hydralazine was evaluated in a double-blind, randomized, crossover study in 38 patients with hypertension. Hydrochlorothiazide plus timolol was more effective than hydrochlorothiazide plus placebo in lowering both supine and standing systolic and diastolic blood pressures. Hydrochlorothiazide plus timolol plus hydralazine was a very effective regimen in lowering both supine and standing systolic and diastolic blood pressure. The patients tolerated this regimen well with greater hypotensive activity and a lower incidence of side effects than on hydrochlorothiazide plus placebo plus hydralazine.