Voriconazole greatly increases the exposure to oral buprenorphine

European Journal of Clinical Pharmacology
Mari FihlmanTeijo I Saari

Abstract

Buprenorphine has low oral bioavailability. Regardless of sublingual administration, a notable part of buprenorphine is exposed to extensive first-pass metabolism by the cytochrome P450 (CYP) 3A4. As drug interaction studies with buprenorphine are limited, we wanted to investigate the effect of voriconazole, a strong CYP3A4 inhibitor, on the pharmacokinetics and pharmacodynamics of oral buprenorphine. Twelve healthy volunteers were given either placebo or voriconazole (orally, 400 mg twice on day 1 and 200 mg twice on days 2-5) for 5 days in a randomized, cross-over study. On day 5, they ingested 0.2 mg (3.6 mg during placebo phase) oral buprenorphine. We measured plasma and urine concentrations of buprenorphine and norbuprenorphine and monitored their pharmacological effects. Pharmacokinetic parameters were normalized for a buprenorphine dose of 1.0 mg. Voriconazole greatly increased the mean area under the plasma concentration-time curve (AUC0-18) of buprenorphine (4.3-fold, P < 0.001), its peak concentration (Cmax) (3.9-fold), half-life (P < 0.05), and excretion into urine (Ae; P < 0.001). Voriconazole also markedly enhanced the Cmax (P < 0.001), AUC0-18 (P < 0.001), and Ae (P < 0.05) of unconjugated norbuprenorphine but dec...Continue Reading

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Citations

Jan 25, 2020·Expert Opinion on Drug Metabolism & Toxicology·Rajiv BalyanVidya Chidambaran
Jun 26, 2020·Drug Design, Development and Therapy·Jiquan ShenBin Liu
Dec 20, 2021·Therapeutic Drug Monitoring·Benjamin KablyEliane M Billaud

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Methods Mentioned

BETA
contraception
pregnancy tests
urine collection

Software Mentioned

WinNonlin
R
ggplot2

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