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Related Experiment Videos

Is low-dose hydrochlorothiazide effective?

P F Magee, E D Freis

    Hypertension (Dallas, Tex. : 1979)
    |June 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    A high dose of hydrochlorothiazide (50 mg/day) combined with nadolol is needed for significant blood pressure reduction. Lower doses of hydrochlorothiazide showed minimal antihypertensive effects when added to nadolol.

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    Area of Science:

    • Cardiology
    • Pharmacology

    Background:

    • Hypertension management often involves combination therapy.
    • Nadolol is a beta-blocker, and hydrochlorothiazide is a diuretic used to treat high blood pressure.

    Purpose of the Study:

    • To evaluate the dose-response relationship of hydrochlorothiazide when added to nadolol in patients with hypertension.
    • To determine the minimum effective dose of hydrochlorothiazide for significant blood pressure lowering in combination therapy.

    Main Methods:

    • Double-blind, crossover study involving 13 patients with elevated diastolic blood pressure.
    • Patients received nadolol (80 mg/day) plus placebo or varying doses of hydrochlorothiazide (12.5 mg, 25 mg, 50 mg) for 3 weeks each, separated by placebo periods.

    Main Results:

    Related Experiment Videos

    • Nadolol plus 12.5 mg hydrochlorothiazide showed no significant blood pressure reduction compared to nadolol alone.
    • 25 mg hydrochlorothiazide significantly reduced systolic but not diastolic pressure.
    • Only 50 mg hydrochlorothiazide daily resulted in significant reductions in both systolic and diastolic blood pressure.

    Conclusions:

    • Low-dose hydrochlorothiazide (12.5 mg/day) has no significant antihypertensive effect when combined with nadolol.
    • A daily dose of 50 mg hydrochlorothiazide is generally required for significant blood pressure lowering in this combination therapy.
    • The study did not show a flat dose-response curve for hydrochlorothiazide from 12.5 to 50 mg/day.