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It is uncertain, given the lack of recent data and the inconclusive nature of previous data, whether ethambutol is cleared by hemodialysis using contemporary dialyzers. We measured serum ethambutol concentrations before, during, and 1 h after hemodialysis in a 75-year-old Caucasian man receiving ethambutol for disseminated Bacille Calmette-Guérin infection. There was a mean 41% decrease in serum ethambutol concentration during dialysis, confirming the hemodialyzability of ethambutol and the utility of drug monitoring in ensuring safety.