Drug Interactions Corner

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Treatment failure with dapsone/ ferrous oxalate–minocycline interaction?


Case report of infection relapse in a patient with HIV taking minocycline and clarithromycin for toxoplasmic encephalitis (TE) and dapsone/ferrous oxalate (Disulone—sanofi-aventis) for primary prevention of Pneumocystitis jirovecii infection suggests an interaction between minocycline and dapsone/ferrous oxalate.


Gallien S et al. Drug-to-drug interaction between dapsone and minocycline: an unusual cause of relapse of toxoplasmic encephalitis in an HIV-infected patient. Scand J Infect Dis. 2009;41:700–2.