Pharmacokinetics of a once-daily extended-release formulation of pramipexole in healthy male volunteers: three studies

Clinical Therapeutics
Peter JennerSebastian Haertter

Abstract

Pramipexole is a dopamine agonist used in the treatment of Parkinson's disease. The currently available immediate-release (IR) formulation is taken orally 3 times daily. These studies were conducted to evaluate the pharmacokinetic properties of a variety of prototypes for a once-daily extended-release (ER) formulation of pramipexole and to further characterize the prototype whose pharmacokinetics best matched those of the IR formulation. Three Phase I studies were conducted, all in healthy adult men aged <or=50 years with a body mass index of 18.5 to 29.9 kg/m(2). In the first study, 7 prototypes of a once-daily ER formulation with various release properties, including rate and pH dependence, were compared with the IR formulation taken 3 times daily to identify the optimal pharmacokinetic resemblance based on predefined criteria derived from plasma AUC(0-24h), C(max), and C(min). In the second study, a level A in vitro/in vivo correlation (IVIVC) suitable for predicting an entire in vivo bioavailability time course based on in vitro dissolution was established and validated, and the single-dose pharmacokinetics of the optimal ER formulation identified in the first study were analyzed for food effect. In the third study, steady-...Continue Reading

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