A Study Comparing the Effectiveness and Safety of Extended-Release Tramadol Versus Placebo in the Treatment of Chronic Low Back Pain

Condition(s) targeted: Chronic Pain

Intervention: Tramadol HCl ER (Drug)

Phase: Phase 3

Status: Completed

Sponsored by: Biovail Laboratories International SRL

The purpose of this study is to compare the analgesic efficacy of oral, once-daily tramadol ER 300 mg and 200 mg to placebo in patients with moderate to severe chronic low back pain requiring daily analgesic treatment. The study hypothesis is that tramadol ER is effective in the treatment of moderate to severe chronic low back pain.

Official title: Double-Blind, Randomized, Placebo-Controlled, Parallel Group Comparison of the Efficacy and Safety of Extended Release Tramadol (Tramadol ER) 300 Mg and 200 Mg to Placebo in the Treatment of Chronic Low Back Pain

Study design: Treatment, Randomized, Double-Blind, Placebo Control, Parallel Assignment, Safety/Efficacy Study

Primary outcome: Patient's pain intensity score since the previous visit,using a visual analog scale(VAS) where 0 mm = no pain and 100 mm = extreme pain.

Secondary outcome:

Patient's current pain intensity VAS score

Patient's global assessment

Roland Disability Index

Patient's sleep assessment

Detailed description: Immediate release (IR) tramadol has demonstrated efficacy in several pain conditions including: obstetrical, gynecological, orthopedic, abdominal, and oral surgery. The short elimination half-life of IR tramadol necessitates every 4-6 hour dosing in order to maintain optimum levels of analgesia in chronic pain. The study medication in this study is a once-daily, extended release (ER) tramadol formulation. This is a multicenter, double-blind, randomized, placebo-controlled, parallel-group study. At the Screening Visit, patients eligible for study participation by medical history, physical exam and other evaluations will enter a 2-7 day washout peroid during which time analgesics will not be allowed. At Visit 2, patients with a pain intensity >= 40 mm on a 100 mm visual analog scale (VAS) and who meet all other eligibility criteria will be admitted into a 3-week, open-label, run-in peroid during which time they will receive tramadol ER 100 mg once daily (QD) for at least 3 days. On Day 4, the dose will be increased to tramadol ER 200 mg QD, based on tolerability. Patients must be mainteained on a minimum dose of tramadol 200 mg QD by the beginning of Week-2 (Visit 3); the dose may be increased to tramadol ER 300 mg QD at Visit 3, based on tolerability. Patients must increase their tramadol ER dose to 300 QD by the beginning of

Week - 1 (Visit 4); this dose must be maintained for one week. Patients with pain

unresponsive to appropriate dose adjustments or with unacceptable side effects will be discontinued from the study and an alternative analgesic therapy will be initiated. Patients receiving tramadol ER 300 mg QD at the end of the run-in peroid (Visit 5, Week 0) will enter a 12-week, double-blind peroid during which they will be randomized to receive tramadol ER 300 mg, tramadol ER 200 mg, or placebo QD. No dose adjustments will be permitted during the double-blind peroid of the study. Patients will return for safety and efficacy evaluations at Weeks 1, 2, 4, 8 and 12 or early termination. Study medication will be discontinued at Week 12 and patients will return after one week for a post-treatment visit (Week 13).

Minimum age: 18 Years. Maximum age: 80 Years. Gender(s): Both.

Criteria:

Inclusion Criteria:

- Patients with a history of chronic low back pain >= 6 months requiring treatment with

NSAIDs, acetaminophen, opioid analgesics, COX-2 selective inhibitors, and/or muscle relaxants for at least 60 of the 90 days preceeding the screening visit; in good health as determined by the investigator on the basis of medical history, physical exam and screening labs; patient's low back pain intensity measures >= 40 mm on a visual analog scale (VAS) at the start of the run-in peroid after the 2-7 day washout; patients who are able to discontinue treatment with NSAIDs, COX-2 selective inhibitors, tramadol, muscle relaxants, opioids, and/or other analgesics during the 2-7 day washout period and all other analgesics throughout the entire study.

Exclusion Criteria:

- Patients with a diagnosis of a complex regional pain syndrome, significant

inflammatory pain, or clinically significant active fibromyalgia; patients with a history of lumbar surgery or chemonucleolysis; patients undergoing transcutaneous electrical nerve stimulation (TENS) or spinal manipulation for low back pain; patients with an uncontrolled medical condition or a clinically significant condition that would, in the investigator's opinion, preclude study participation; patients using analgesics or other agents during washout that could confound the analgesic response.

Starting date: November 2000
Ending date: November 2001
Last updated: July 2, 2006