A1 Refereed original research article in a scientific journal
Voriconazole more likely than posaconazole increases plasma exposure to sublingual buprenorphine causing a risk of a clinically important interaction
Authors: Fihlman M, Hemmila T, Hagelberg NM, Kuusniemi K, Backman JT, Laitila J, Laine K, Neuvonen PJ, Olkkola KT, Saari TI
Publisher: SPRINGER HEIDELBERG
Publication year: 2016
Journal: European Journal of Clinical Pharmacology
Journal name in source: EUROPEAN JOURNAL OF CLINICAL PHARMACOLOGY
Journal acronym: EUR J CLIN PHARMACOL
Volume: 72
Issue: 11
First page : 1363
Last page: 1371
Number of pages: 9
ISSN: 0031-6970
DOI: https://doi.org/10.1007/s00228-016-2109-y
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/17338379
This study aimed to determine possible effects of voriconazole and posaconazole on the pharmacokinetics and pharmacological effects of sublingual buprenorphine.We used a randomized, placebo-controlled crossover study design with 12 healthy male volunteers. Subjects were given a dose of 0.4 mg (0.6 mg during placebo phase) sublingual buprenorphine after a 5-day oral pretreatment with either (i) placebo, (ii) voriconazole 400 mg twice daily on the first day and 200 mg twice daily thereafter or (iii) posaconazole 400 mg twice daily. Plasma and urine concentrations of buprenorphine and its primary active metabolite norbuprenorphine were monitored over 18 h and pharmacological effects were measured.Compared to placebo, voriconazole increased the mean area under the plasma concentration-time curve (AUC(0-a)) of buprenorphine 1.80-fold (90 % confidence interval 1.45-2.24; P < 0.001), its peak concentration (C-max) 1.37-fold (P < 0.013) and half-life (t (A1/2) ) 1.37-fold (P < 0.001). Posaconazole increased the AUC0(0-a) of buprenorphine 1.25-fold (P < 0.001). Most of the plasma norbuprenorphine concentrations were below the limit of quantification (0.05 ng/ml). Voriconazole, unlike posaconazole, increased the urinary excretion of norbuprenorphine 1.58-fold (90 % confidence interval 1.18-2.12; P < 0.001) but there was no quantifiable parent buprenorphine in urine. Plasma buprenorphine concentrations correlated with the pharmacological effects, but the effects did not differ significantly between the phases.Voriconazole, and to a minor extent posaconazole, increase plasma exposure to sublingual buprenorphine, probably via inhibition of cytochrome P450 3 A and/or P-glycoprotein. Care should be exercised in the combined use of buprenorphine with triazole antimycotics, particularly with voriconazole, because their interaction can be of clinical importance.
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