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This phase 1, open‐label study evaluated the pharmacokinetic effects of coadministration of the antifungal agent, isavuconazole (administered as its water‐soluble prodrug isavuconazonium sulfate), with the antiretroviral agent lopinavir/ritonavir in healthy adults. In part 1, 13 subjects were randomized to 2 arms to receive multiple doses of oral isavuconazole 100 mg either alone or with lopinavir/ritonavir 400/100 mg. In part 2, a different group of 55 subjects were randomized to 3 arms to receive multiple doses of oral isavuconazole 200 mg, either alone or with lopinavir/ritonavir 400/100 mg, or to receive oral lopinavir/ritonavir 400/100 mg alone. Mean area under the concentration‐time curve (AUC) following the last dose (AUC τ ) and C max  of isavuconazole increased by 113% and 96% in part 1 and by 96% and 74% in part 2 in the presence vs absence of lopinavir/ritonavir, respectively. Mean AUC τ  and C max  of lopinavir were 27% and 23% lower, and mean AUC τ  and C max  of ritonavir were 31% and 33% lower in the presence vs absence of isavuconazole, respectively. Mild to moderate gastrointestinal disorders were the most common adverse events experienced. These findings indicate that coadministration of lopinavir/ritonavir with isavuconazole can decrease the exposure of lopinavir/ritonavir and increase the exposure of isavuconazole. Patients should be monitored for reduced antiviral efficacy if these agents are coadministered.

Pharmacokinetic Interaction Between Isavuconazole and a Fixed‐Dose Combination of Lopinavir 400 mg/Ritonavir 100 mg in Healthy Subjects