in a double-blind study 30 patients with mild or moderate ( world health organization classification i or ii ) hypertension were treated with either nifedipine , 20 mg twice a day , or bendroflumethiazide , 2.5 mg ( +0.57 g kcl ) twice a day for 24 weeks .
C0020538
hypertension
C0004975
bendroflumethiazide