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In page Tacrolimus:

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Interactions include that with grapefruit which increases tacrolimus plasma concentrations. As infections are a major cause of morbidity and mortality in the post-transplant patient, the most commonly[citation needed] reported interactions include interactions with anti-microbial drugs. Macrolide antibiotics including erythromycin and clarithromycin, as well as several of the newer classes of antifungals, especially of the azole class (fluconazole, voriconazole), increase tacrolimus levels by competing for cytochrome enzymes.[1]