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J Antimicrob Chemother. 2010 Oct;65(10):2188-94. doi: 10.1093/jac/dkq280. Epub 2010 Jul 28.

Effect of posaconazole on the pharmacokinetics of fosamprenavir and vice versa in healthy volunteers.

Author information

1
Radboud University Nijmegen Medical Centre, Department of Clinical Pharmacy, Nijmegen, The Netherlands. r.bruggemann@akf.umcn.nl

Abstract

OBJECTIVES:

To manage the interaction between fosamprenavir/ritonavir and posaconazole, we hypothesized that ritonavir can be replaced by posaconazole as an alternative booster of fosamprenavir with no significant influence on posaconazole pharmacokinetics.

METHODS:

This was an open-label, randomized, three period, cross-over, single-centre trial in 24 healthy volunteers. All subjects received the following three treatments for 10 days, separated by washout periods of 17 days: posaconazole 400 mg twice daily; fosamprenavir/ritonavir 700/100 mg twice daily; posaconazole 400 mg twice daily with fosamprenavir 700 mg twice daily.

RESULTS:

Twenty subjects completed the trial. Geometric mean ratios (GMR; +90% confidence interval) of posaconazole AUC and C(max) when taken with fosamprenavir versus posaconazole alone were 0.77 (0.68-0.87) and 0.79 (0.71-0.89), respectively. The GMRs of amprenavir AUC and C(max) when taken as fosamprenavir and posaconazole versus fosamprenavir/ritonavir were 0.35 (0.32-0.39) and 0.64 (0.55-0.76), respectively. No serious adverse events were reported during the trial.

CONCLUSION:

Unboosted fosamprenavir should not be used concomitantly with posaconazole.

PMID:
20667889
DOI:
10.1093/jac/dkq280
[Indexed for MEDLINE]

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