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Dapsone toxicity: some current perspectives

M D Coleman1

  • 1Department of Pharmaceutical Sciences, Aston University, Birmingham, UK.

General Pharmacology
|November 1, 1995
PubMed
Summary
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Dapsone metabolism causes adverse effects like methaemoglobinaemia and agranulocytosis. Cimetidine, a metabolic inhibitor, reduces these side effects by decreasing dapsone oxidation, improving patient compliance.

Area of Science:

  • Pharmacology
  • Toxicology
  • Immunology

Background:

  • Dapsone, an anti-inflammatory and anti-parasitic drug, is metabolized by cytochrome P-450 to hydroxylamines.
  • These metabolites can cause methaemoglobinaemia and haemolysis, but erythrocytes can detoxify them via a glutathione-dependent pathway.
  • Paradoxically, this same pathway may contribute to dapsone-induced agranulocytosis by damaging granulocyte precursors.

Purpose of the Study:

  • To investigate methods for improving patient tolerance to dapsone therapy.
  • To evaluate the efficacy of metabolic inhibitors in reducing dapsone-related adverse effects.

Main Methods:

  • Investigated the metabolic pathways of dapsone and its toxic hydroxylamine metabolites.
  • Assessed the role of erythrocytes in dapsone metabolism and toxicity.

Related Experiment Videos

  • Evaluated the effect of cimetidine, a metabolic inhibitor, on dapsone-induced methaemoglobinaemia and patient-reported side effects.

    • Main Results:

    • Dapsone metabolism generates hydroxylamines, leading to methaemoglobinaemia and potential agranulocytosis.
    • Erythrocytes play a dual role in detoxifying and potentially channeling dapsone metabolites to bone marrow.
    • Cimetidine significantly reduced methaemoglobinaemia (by 30%) and improved patient-reported side effects like headache and lethargy during dapsone therapy.

    Conclusions:

    • Dapsone's efficacy is linked to its glutathione-dependent metabolism, but this also drives its major toxicities.
    • Cimetidine offers an immediate strategy to enhance patient compliance and reduce dapsone's adverse effects.
    • This approach is particularly beneficial for patients on high dapsone dosages (>200 mg/day).