Differential effects of food on the bioavailability of controlled-release oxycodone tablets and immediate-release oxycodone solution.

The effects of a high-fat meal on the bioavailability of oxycodone hydrochloride, administered as a recently developed 40 mg controlled-release (CR) tablet or a 20 mg immediate-release (IR) solution, were evaluated in a randomized crossover study in 22 normal male and female subjects. Serial blood samples were collected for 36 h after dosing and analyzed for oxycodone by a validated method using gas chromatography/mass spectrometry. There was no significant food effect with CR oxycodone as judged by 90% confidence interval (CI) analysis of AUC0-infinity and Cmax values under fed and fasted conditions. For the IR solution, both oxycodone bioavailability and peak plasma oxycodone concentration were significantly altered by consumption of the high-fat meal, with the mean value for AUC0-infinity increasing to 120% (CI = 109-132%) and the mean value for Cmax decreasing to 82% (CI = 47-91%) of values observed in the fasted condition. Adverse events reported for both formulations were mostly mild to moderate in severity and typical of those observed with opioids.