title: Time course of antihypertensive effect of low-dose captopril in mild to moderate hypertension.
abstract: The time course of various doses of captopril (C) alone, hydrochlorothiazide (H) alone, and C with H was followed in 142 subjects with mild hypertension. Doses of C were 12.5, 25, and 50 mg three times daily or 37.5 mg twice daily and dose of H was 25 mg twice daily. Time-course measurements were made during continuous treatment, with morning dose omitted on the test day. After C alone, diastolic blood pressure (BP) fell to its lowest point 2 to 5 hr and then gradually returned toward baseline. Reductions from levels before treatment were present 13 hr after a dose and there were no significant differences between various doses of C at that time. Systolic BP fell only with the larger doses. When C was combined with H, both systolic and diastolic BP decreased more than with either C or H alone, reaching a nadir at 2 hr. BP remained significantly below levels before treatment for at least 13 hr after dosing. Except for the response to the lowest (12.5 mg) dose, small doses of C alone had the same effect as large doses on both degree and duration of antihypertensive response. Effect was considerably enhanced by addition of a thiazide diuretic.
mesh_terms: D000284:Administration, Oral; D001794:Blood Pressure / Q000187:drug effects; D002216:Captopril / Q000627:therapeutic use*; D004341:Drug Evaluation; D004357:Drug Synergism; D004359:Drug Therapy, Combination; D006801:Humans; D006852:Hydrochlorothiazide / Q000627:therapeutic use*; D006973:Hypertension / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D011187:Posture; D011392:Proline / Q000031:analogs & derivatives*; D013997:Time Factors
chemical_list: D006852:Hydrochlorothiazide; D011392:Proline; D002216:Captopril