Safe Management of Tacrolimus Together With Posaconazole in Lung Transplant Patients With Cystic Fibrosis

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Oral posaconazole (PSZ), an azole antifungal drug, was recently introduced for the treatment of invasive fungal infections. The prescription of PSZ together with the immunosuppressant tacrolimus (TRL) was evaluated in 14 lung transplant patients with cystic fibrosis. PSZ inhibited CYP3A4 TRL metabolism, resulting in a decrease of TRL dose by a factor of 3, with tapering to a mean of 2 mg/d. Previous studies with itraconazole and voriconazole showed that TRL dose could be decreased by factors of 5 and 4, respectively. Joint therapeutic drug monitoring of TRL and PSZ was carried out to investigate the high risk of interindividual variability associated with this coprescription in such patients.

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