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Labopharm, Inc, 480 boul Armand-Frappier, Laval, Québec, H7V 4B4, Canada. dkarhu@labopharm.com
The pharmacokinetics of a once-daily formulation of tramadol (Tramadol Contramid OAD 200-mg tablets) following single-dose and multiple-dose administration was compared with that of an immediate-release product (tramadol IR 50-mg tablets) in 2 separate studies. In both studies, AUC parameters met bioequivalence criteria, whereas C(max) of Tramadol Contramid OAD was lower than that of tramadol IR following a 200-mg daily dosage. After single-dose administration, the mean tramadol concentration at 1 hour postdose was within the range associated with analgesic efficacy (>100 ng/mL), and the mean concentration remained above this level for the remainder of the dosing interval. Steady state was attained within 48 hours following multiple-dose administration. Tramadol Contramid OAD provides a rapid rise in plasma concentrations and an equivalent daily systemic exposure as tramadol IR, with a reduction in peak plasma concentrations.
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