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Related Experiment Videos

Beta-blockers: once or three times a day?

T Reybrouck, A Amery, R Fagard

    British Medical Journal
    |May 27, 1978
    PubMed
    Summary

    A single daily dose of metoprolol effectively lowers blood pressure in hypertensive patients. However, for consistent beta-blockade, a thrice-daily regimen is recommended due to less fluctuation in drug concentration.

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    Area of Science:

    • Cardiology
    • Pharmacology

    Background:

    • Hypertension management requires effective blood pressure control.
    • Beta-blockers like metoprolol are crucial in cardiovascular therapy.
    • Understanding optimal dosing regimens is key for therapeutic efficacy.

    Purpose of the Study:

    • To compare the efficacy of single-dose versus thrice-daily dosing of metoprolol in hypertensive patients.
    • To evaluate the impact of different metoprolol dosing frequencies on plasma drug concentrations and beta-blockade.
    • To assess the influence of dosing regimen on blood pressure reduction and its variability.

    Main Methods:

    • Double-blind, crossover trial involving 16 hypertensive patients.
    • Treatment arms included placebo, metoprolol 300 mg once daily, and metoprolol 300 mg daily in three divided doses.
    • Beta-blockade assessed via exercise tachycardia; plasma drug concentrations monitored.

    Main Results:

    • Both single-dose and thrice-daily metoprolol regimens achieved significant blood pressure reduction.
    • Thrice-daily dosing resulted in stable plasma metoprolol concentrations and consistent beta-blockade.
    • Single-dose regimen showed considerable fluctuations in drug levels and beta-blockade throughout the day.

    Conclusions:

    • Single-dose metoprolol (300 mg) is effective for blood pressure reduction in hypertension.
    • For sustained and steady beta-blockade, a thrice-daily metoprolol regimen is superior.
    • Dosing frequency significantly impacts pharmacokinetic and pharmacodynamic profiles of metoprolol.

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