Maintenance of the long-term effectiveness of tramadol in treatment of the pain of diabetic neuropathy

J Diabetes Complications. Mar-Apr 2000;14(2):65-70. doi: 10.1016/s1056-8727(00)00060-x.


Objective: The objective of this study was to evaluate the efficacy and safety of tramadol in a 6-month open extension following a 6-week double-blind randomized trial.

Research design and methods: Patients with painful diabetic neuropathy who completed the double-blind study were eligible for enrollment in an open extension of up to 6 months. All patients received tramadol 50-400 mg/day. Self-administered pain intensity scores (scale 0-4; none to extreme pain) and pain relief scores (scale -1-4; worse to complete relief) were recorded the first day of the open extension (last day of the double-blind phase) and at 30, 90, and 180 days.

Results: A total of 117 patients (56 former tramadol and 61 former placebo) entered the study. On the first day of the study, patients formerly treated with placebo had a significantly higher mean pain intensity score (2. 2+/-1.02 vs. 1.4+/-0.93, P<0.001) and a lower pain relief score (0. 9+/-1.43 vs. 2.2+/-1.27, P<0.001) than former tramadol patients. By Day 90, both groups had mean pain intensity scores of 1.4, which were maintained throughout the study. Mean pain relief scores (2. 4+/-1.09 vs. 2.2+/-1.14) were similar after 30 days in the former placebo and former tramadol groups, respectively and were maintained for the duration of the study. Four patients discontinued therapy due to ineffective pain relief; 13 patients discontinued due to adverse events. The most common adverse events were constipation, nausea, and headache.

Conclusions: Tramadol provides long-term relief of the pain of diabetic neuropathy.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • African Continental Ancestry Group
  • Aged
  • Aged, 80 and over
  • Analgesics, Opioid / adverse effects
  • Analgesics, Opioid / therapeutic use*
  • Diabetic Neuropathies / physiopathology*
  • Double-Blind Method
  • European Continental Ancestry Group
  • Female
  • Glycated Hemoglobin A / analysis
  • Humans
  • Male
  • Middle Aged
  • Pain / drug therapy*
  • Pain Measurement
  • Tramadol / adverse effects
  • Tramadol / therapeutic use*
  • United States


  • Analgesics, Opioid
  • Glycated Hemoglobin A
  • Tramadol