Comment; Inhibition of liver cytochrome P450 CYP3A inhibited the formation of 6β-hydroxytestosterone from testosterone and the metabolism of tacrolimus by 50%. Tacrolimus is an anti-rejection drug that inhibits T-Cell activity by increasing T-cell regulation. The rank order of inhibition of 6β-hydroxytestosterone formation from testosterone and the metabolism of tacrolimus, is ketoconazole > itraconazole > voriconazole > fluconazole. Antifungals cannot be used with impunity; consideration of interactions must be made!
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