Characterization and validation of a pharmacokinetic model for controlled-release oxycodone

British Journal of Clinical Pharmacology
J W MandemaD R Stanski

Abstract

1. Oxycodone is a strong opioid agonist that is currently available in immediate-release (IR) formulations for the treatment of moderate to severe pain. Recently, controlled-release (CR) oxycodone tablets were developed to provide the benefits of twice-a-day dosing to patients treated with oxycodone. The purpose of this investigation was to develop and validate a pharmacokinetic model for CR oxycodone tablets in comparison with IR oxycodone solution. 2. Twenty-four normal male volunteers were enrolled in a single-dose, randomized, analytically blinded, two-way crossover study designed to compare the pharmacokinetics of two 10 mg CR oxycodone tablets with 20 mg IR oxycodone oral solution. Pharmacokinetic models describing the oxycodone plasma concentration vs time profiles of CR tablets and IR solution were derived using NONMEM version IV. The predictive performance of the models was assessed by comparison of predicted oxycodone plasma concentrations with actual oxycodone plasma concentrations observed in a separate group of 21 volunteers who received repeated doses of IR and CR oxycodone for 4 days. 3. The unit impulse disposition function of oxycodone was best described by a one-compartment model. Absorption rate of the IR sol...Continue Reading

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