three therapies were used to treat 35 patients with mild to moderate systemic hypertension : ( 1 ) the cardioselective beta-adrenoceptor blocker atenolol , ( 2 ) the calcium antagonist nifedipine and ( 3 ) combination therapy for those who failed to reach the target diastolic blood pressure ( bp ) of less than 90 mm hg with monotherapy .
C0020538
systemic
C0028066
nifedipine