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Moduretic-induced metabolic acidosis and hyperkalaemia

H H Wan, M D Lye

    Postgraduate Medical Journal
    |May 1, 1980
    PubMed
    Summary
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    A patient experienced severe metabolic acidosis and hyperkalemia while on Moduretic. Symptoms resolved after discontinuing the medication, suggesting a link between the drug and these electrolyte imbalances.

    Area of Science:

    • Nephrology
    • Clinical Pharmacology

    Background:

    • Moduretic, a combination diuretic containing amiloride and hydrochlorothiazide, is commonly prescribed for hypertension and edema.
    • Electrolyte disturbances, including hyperkalemia and metabolic acidosis, are known potential side effects of potassium-sparing diuretics like amiloride.

    Observation:

    • A case study details a patient who developed significant metabolic acidosis and severe hyperkalemia (peak potassium 7.6 mmol/l) during Moduretic treatment.
    • Despite severe hyperkalemia, the patient's total body potassium levels remained normal throughout the observation period.

    Findings:

    • Discontinuation of Moduretic led to the normalization of the patient's acid-base balance and serum potassium levels within approximately 10 days.
    • The findings suggest a direct causal relationship between Moduretic use and the observed metabolic disturbances.

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    Implications:

    • This case highlights the importance of monitoring electrolytes and acid-base balance in patients taking Moduretic, especially those with risk factors for hyperkalemia.
    • Further investigation into the specific mechanisms by which amiloride and hydrochlorothiazide contribute to metabolic acidosis and hyperkalemia in certain patients is warranted.