Pain Research and Management (Jan 2008)
A Randomized, Double-Blind, Crossover Comparison of the Efficacy and Safety of Oral Controlled-Release Tramadol and Placebo in Patients with Painful Osteoarthritis
Abstract
OBJECTIVE: To compare the efficacy and safety of controlled-release (CR) tramadol (Zytram XL, Purdue Pharma, Canada) and placebo in patients with painful osteoarthritis.