Extended-release tramadol (tramadol ER) in the treatment of chronic low back pain.
J Opioid Manag 4(2):87-97 (2008) PMID 18557165
This study evaluated the safety and efficacy of tramadol ER 300 mg and 200 mg versus placebo once daily in the treatment of chronic low back pain, using an open-label run-in followed by, without washout, a randomized controlled study design.
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