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Related Experiment Videos

Clopamide: plasma concentrations and diuretic effect in humans.

J J McNeil, E L Conway, O H Drummer

    Clinical Pharmacology and Therapeutics
    |September 1, 1987
    PubMed
    Summary

    Clopamide, a diuretic, shows predictable pharmacokinetics with a 10-hour half-life. Lower doses may be as effective as higher ones for sodium and chloride excretion, but higher doses can increase hypokalemia risk.

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    Area of Science:

    • Pharmacology
    • Clinical Pharmacology
    • Diuretic Agents

    Background:

    • Clopamide is a thiazide-like diuretic used for hypertension.
    • Understanding its pharmacokinetic and pharmacodynamic profile is crucial for optimal dosing.

    Purpose of the Study:

    • To determine the pharmacokinetics of clopamide after oral administration.
    • To evaluate the dose-response relationship for diuretic activity.
    • To compare the effects of clopamide with chlorothiazide, particularly regarding electrolyte excretion and hypokalemia during chronic use.

    Main Methods:

    • Oral doses of clopamide (5, 10, 20 mg) were administered to healthy volunteers.
    • Plasma concentrations, AUC, and elimination half-life were measured.
    • Urinary excretion of sodium, chloride, and potassium was monitored.

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  • A comparative study with chlorothiazide (500 mg) was conducted in hypertensive patients during chronic administration.

    • Main Results:

    • Clopamide exhibited dose-proportional pharmacokinetics with a peak plasma concentration within 2 hours and an elimination half-life of approximately 10 hours.
    • Diuretic activity peaked with plasma concentrations and lasted 12-24 hours.
    • Sodium and chloride excretion showed minimal differences between clopamide doses, suggesting saturation near 5 mg.
    • Clopamide (10 mg daily) resulted in more marked hypokalemia than clopamide (5 mg) or chlorothiazide (500 mg) during chronic administration.

    Conclusions:

    • Clopamide demonstrates predictable pharmacokinetics and dose-dependent diuretic effects.
    • Lower doses of clopamide may achieve maximal diuretic efficacy for sodium and chloride excretion.
    • Higher doses of clopamide (10 mg) are associated with a greater risk of hypokalemia compared to lower doses or chlorothiazide during chronic therapy in hypertensive patients.