Fosamprenavir plus ritonavir increases plasma ketoconazole and ritonavir exposure, while amprenavir exposure remains unchanged.

Antimicrob Agents Chemother

Clinical Pharmacology and Discovery Medicine, GlaxoSmithKline, Research Triangle Park, NC 27709, USA.

Published: August 2007

Plasma ketoconazole (KETO), amprenavir (APV), and ritonavir (RTV) pharmacokinetics were evaluated in 15 healthy subjects after being treated with KETO at 200 mg once daily (QD), fosamprenavir (FPV)/RTV at 700/100 mg twice daily (BID), and then KETO at 200 mg QD plus FPV/RTV at 700/100 mg BID in this open-label study. The KETO area under the concentration-time curve at steady state was increased 2.69-fold with FPV/RTV. APV exposure was unchanged, and RTV exposure was slightly increased.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1932497PMC
http://dx.doi.org/10.1128/AAC.00008-07DOI Listing

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