Although diuretics are recommended for the treatment of hypertension, decreased diuretic use and increased calcium antagonist use necessitate a comparison of the efficacy of these drugs in preventing cardiovascular events. Patients Ն60 years of age with systolic blood pressure of 160 to 220 mm Hg and diastolic blood pressure Ͻ115 mm Hg were enrolled. Patients were randomly assigned to 20 mg of sustained-release nicardipine hydrochloride twice daily or 2 mg of trichlormethiazide once daily by

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... double-dummy method and followed up for 5 years. A total of 414 patients were analyzed: 204 in the nicardipine group and 210 in the diuretic group. Blood pressure at entry was 172/94 mm Hg and 173/93 mm Hg, respectively, and decreased to 147/81 mm Hg and 147/79 mm Hg, respectively. Cardiovascular morbidity rates per 1000 persons per year were similar in the nicardipine and diuretic groups (27.8 and 26.8, respectively; Pϭ0.923). The sex-and age-adjusted risk ratio for the nicardipine group was 0.973 (95% confidence interval, 0.514 to 1.839, Pϭ0.932). The calcium antagonist and diuretic groups had a similarly decreased rate of cardiovascular events. (Hypertension. 1999;34:1129-1133.)