The concomitant treatment of HIV-tuberculosis co-infection is complicated by pharmacological interactions between drugs, resulting in unpredictable drug levels. We monitored efavirenz levels in all tuberculosis-HIV-treated patients over 2 years. Using 800 mg/day of efavirenz, high levels and toxicity were detected in seven out of nine patients, necessitating reduction or discontinuation. Polymorphisms in cytochrome P450 2B6 may account for this. Therapeutic drug monitoring, dose reduction or a lower starting dose may be appropriate in some patients to abrogate toxicity.

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