Background: Ropinirole 24-hour prolonged release is a new once-daily formulation of ropinirote that provides continuous delivery of ropinirole over 24 hours. Objective: The studies described here were conducted to characterize the steady-state pharmacokinetics of ropinirole 24-hour prolonged release In patients with Parkinson's disease. Methods: Study 164 was a 2-part study; Parr A employed a crossover design to assess the relative bloavailability of steady-state ropinirole 24-hour prolonged release 8 mg QD and ropinirole immediate release 2.5 mg TID, and Part B evaluated the effect of food intake on the rate and extent of ropinirole absorption from ropintrole 24-hour prolonged release 8 mg QD. Study 165 assessed the dose proportionality of ropinlrole 24-hour prolonged release 2-, 4-, and 8-mg tablets and the dose-strength equivalence of four 2-mg tablets compared with one 8-mg tablet. Intensive pharmacokinetic blood sampling was performed over 24 hours. Steady-state C-max, C-min AUC from time zero to 24 hours after dosing (AUC(0-24)), and T-max were determined by noncompartmental methods. Results: Twenty-three patients (91% white; mean age, 67 years [range, 34-80 years]; mean weight, 84.5 kg [range, 57-103 kg]) were randomized to treatment in Study 164. Twenty-eight patients (86% white; mean age, 67 years [range, 47-87 years]; mean weight, 84.6 kg [range, 49-128 kgJ) were randomized to treatment in Study 165. Compared with ropinirole immediate release, ropinirole 24-hour prolonged release had a smooth plasma concentration-time profile over 24 hours. AUC(0-24) and C-min, values, normalized to a 1-mg dose, were similar for ropinirole 24-hour prolonged release and ropinirole immediate release. Dose-normalized C-max was slightly lower (similar to 12%) for ropinlrole 24-hour prolonged release than for ropinirole immediate release. The AUC(0-24) and C-min were similar in the fed and fasted states. The pharmacokinetics of ropinirole 24-hour prolonged release were dose proportional, as indicated by the estimated slopes for AUC(0-24) and C-max being close to unity, along with the 90% CIs being contained within the predefined dose-range-adjusted limits. For Cmin, the slope was close to unity (1.04), but the upper end of the 90% CI fell marginally outside the predefined range. Statistical analysis indicated that the dose strengths were equivalent when a single pharmacokinetic outlier was excluded from the analysis. Conclusions: Ropinirole 24-hour prolonged release provided continuous delivery of ropinirole over 24 hours, resulting in a smooth plasma concentration-time profile, and food had no significant effect on absorption. Dose-normalized AUC(0-24) and C-min were similar for both formulations, and dose-normalized C-max. was slightly lower for ropinirole 24-hour prolonged release. These relative bloavailability data indicated that patients may switch overnight from ropinirole immediate release to ropinirole 24-hour prolonged release while maintaining similar daily exposure. The pharmacokinetics of ropinlrole were dose proportional over the range from 2 to 8 mg. The dose strengths of four 2-mg tablets and one 8-mg tablet of ropinirole 24-hour prolonged release were found to be equivalent.
