Cite this: Tramadol SR Formulations: Pharmacokinetic Comparison of a Multiple-Units Dose (Capsule) versus a Single-Unit Dose (Tablet) - Medscape - Jul 01, 2005.

Twenty-four healthy subjects (12 male and 12 female) were included in the trial. They were aged between 22 and 45 (mean 34.4) years, and had body mass indexes of 19.0-28.8 (mean 24.7) kg/m 2.