title: Pharmacokinetic comparison of sustained-release and standard buprenorphine in mice.
abstract: Effective pain medication is important for animal stewardship and valid research results. We compared the pharmacokinetic assessments of standard, immediate-release buprenorphine (Bup IR) and a sustained-release buprenorphine formulation (Bup SR Lab) in male C57BL/6J mice, a mouse strain commonly used in biomedical research. We postulated that the administration of Bup SR Lab would achieve a more persistent blood drug concentration (>1 ng/mL) compared with single-dose Bup IR. The study assumed a blood buprenorphine concentration of 1 ng/mL as the minimum that may result in adequate analgesia, as previously reported. The 7 experimental groups included Bup IR (0.03, 0.05, 0.1, and 2 mg/kg), Bup SR Lab (0.3 and 1.2 mg/ kg), and saline placebo (0.7 mL/100 g). Blood sampling occurred at 0.5, 1, 3, 6, 12, 24, 48, and 72 h for evaluation by using a forensic ELISA. Bup IR at 0.03 and 0.05 mg/kg and Bup SR Lab at 0.3 mg/kg failed to obtain maximal blood concentrations (Cmax) above 1 ng/mL. All other doses (0.1 and 2 mg/kg Bup IR and 1.2 mg/kg Bup SR Lab) reached a Cmax above 1 ng/mL within 3 h after injection. In addition, 1.2 mg/kg Bup SR Lab and 2 mg/kg Bup IR provided blood concentrations above 1 ng/mL for up to 12 h, and 0.1 mg/kg Bup IR achieved this criterion for as long as 3 h. In conclusion, Bup SR Lab at 1.2 mg/kg and Bup IR at 0.1 or 2.0 mg/kg achieve or surpass the published threshold for adequate analgesia in mice.
authors.affiliation: National Heart, Lung, and Blood Institute, Bethesda, Maryland, USA; Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA.
authors.forename: Tannia S
authors.initials: TS
authors.lastname: Clark
authors.affiliation: Eastern Research Group, Arlington, Virginia, USA.
authors.forename: David D
authors.initials: DD
authors.lastname: Clark
authors.affiliation: National Heart, Lung, and Blood Institute, Bethesda, Maryland, USA.
authors.forename: Robert F
authors.initials: RF
authors.lastname: Hoyt
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000493:pharmacokinetics*; D000818:Animals; D002047:Buprenorphine / Q000008:administration & dosage / Q000493:pharmacokinetics*; D003692:Delayed-Action Preparations; D008297:Male; D008810:Mice, Inbred C57BL; D010146:Pain / Q000188:drug therapy*; D010147:Pain Measurement
chemical_list: D000701:Analgesics, Opioid; D003692:Delayed-Action Preparations; D002047:Buprenorphine