Tramadol Extended-Release (ER) for Posttraumatic Stress Disorder (PTSD)

This was a six-week pilot study testing the efficacy of tramadol extended-release (ER) for posttraumatic stress disorder (PTSD). Men and women aged 21-55 years with combat-related PTSD or PTSD resulting from a civilian trauma were recruited. Blinded tramadol ER was begun with a 100 mg daily dose for the first week, with an option to increase to 200 mg/day for the 2nd week. Dose adjustments, using a range of 100-300 mg tramadol ER per day (or 1 to 3 placebo tabs), were permitted thereafter. The primary hypothesis was that tramadol ER 100 to 300 mg every morning for 6 weeks would reduce the symptoms of PTSD relative to placebo. The primary outcome measures were PTSD symptoms as rated by the Clinician-Administered PTSD Scale (CAPS) and Clinicians Global Impressions scale at baseline and weeks one, two, four, and six.

This was a single-site, double-blind, placebo-controlled, randomized, 6-week, parallel-group, flexible-dose outpatient trial of tramadol ER 100-300 mg once every morning for PTSD. Double-blinded clinical outcome measures were obtained during screening, and at weeks 0 (pre-randomization), 1, 2, 4, and 6; outcome was also assessed at week 7, the follow-up and study discharge visit, which occurred one week after the discontinuation of study medicine. Tramadol ER (or placebo) was started at 100 mg daily and increased weekly over the next two weeks, as tolerated, to a maximum of 300 mg daily. Dose change was also permitted at week 4. Matching drug and placebo were prepared by a research pharmacy using over-encapsulation in locking DB capsules supplied by Capsugel. Lactose was used as a filler to attain uniformity in weight. Randomization used a 1:1 allocation ratio and was via a block design, with stratification by military service. Other than the research pharmacists, all study personnel, all staff, and all subjects were blind.