a double-blind , within-patient study was carried out in 23 newly diagnosed patients with mild to moderate hypertension ( diastolic blood pressure of at least 100 mmhg ) to compare the antihypertensive effects of atenolol ( 100 mg ) and chlorthalidone ( 25 mg ) given in free and fixed combination .
C0020538
hypertension
C0004147
atenolol