fifty-five patients with primary hypertension , world health organization ( who ) stages i and ii , were randomly allocated to a 9-mo multicenter , controlled , double-blind , crossover study with timolol , a nonselective beta adrenoceptor blocker , and hydrochlorothiazide combined with the potassium-sparing drug amiloride ( ahct ) .
C0032821
potassium
C0002502
amiloride