Interactions between buprenorphine and the protease inhibitors darunavir-ritonavir and fosamprenavir-ritonavir.

Gruber VA, Rainey PM, Moody DE, Morse GD, Ma Q, Prathikanti S, Pade PA, Alvanzo AA, McCance-Katz EF.

Clin Infect Dis. 2012 Feb 1;54(3):414-23. doi: 10.1093/cid/cir799. Epub 2011 Nov 18.

BACKGROUND: This study examined drug interactions between buprenorphine, a partial opioid agonist used for opioid dependence treatment and pain management, and the protease inhibitors (PIs) darunavir-ritonavir and fosamprenavir-ritonavir. METHODS: The pharmacokinetics of buprenorphine and its metabolites and symptoms of opioid withdrawal or excess were compared in opioid-dependent, buprenorphine-naloxone-maintained, human immunodeficiency virus (HIV)-negative volunteers (11 for darunavir-ritonavir and 10 for fosamprenavir-ritonavir) before and after 15 days of PI administration. PI pharmacokinetics and adverse effects were compared between the buprenorphine-maintained participants and an equal number of sex-, age-, race-, and weight-matched, healthy, non-opioid-dependent volunteers who received darunavir-ritonavir or fosamprenavir-ritonavir but not buprenorphine. RESULTS: There were no significant changes in buprenorphine or PI plasma levels and no significant changes in medication adverse effects or opioid withdrawal. Increased concentrations of the inactive metabolite buprenorphine-3-glucuronide suggested that darunavir-ritonavir and fosamprenavir-ritonavir induced glucuronidation of buprenorphine. CONCLUSIONS: Dose adjustments are not likely to be necessary when buprenorphine and darunavir-ritonavir or fosamprenavir-ritonavir are coadministered for the treatment of opioid dependence and HIV disease.

PMID: 22100576

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.