Topiramate vs placebo in painful diabetic neuropathy: analgesic and metabolic effects

Neurology
P RaskinCAPSS-141 Study Group

Abstract

Using identical methods, three simultaneous placebo-controlled trials of topiramate for painful diabetic neuropathy (PDN) did not reach significance. This independent yet concurrent placebo-controlled trial used different methods to assess topiramate efficacy and tolerability in PDN. This 12-week, multicenter, randomized, double-blind trial included 323 subjects with PDN and pain visual analog (PVA) score of at least 40 on a scale from 0 (no pain) to 100 (worst possible pain). Topiramate (n = 214) or placebo (n = 109) was titrated to 400 mg daily or maximum tolerated dose. Short-acting rescue analgesics were permitted only during the first 6 weeks. Baseline characteristics were comparable between groups except for mean body weight (topiramate, 101.4 kg; placebo, 95.7 kg; p = 0.028). Twelve weeks of topiramate treatment reduced PVA scale score (from 68.0 to 46.2 mm) more effectively than placebo (from 69.1 to 54.0 mm; p = 0.038). Fifty percent of topiramate-treated subjects and 34% of placebo-treated subjects responded to treatment, defined as >30% reduction in PVA scale score (p = 0.004). Topiramate monotherapy also reduced worst pain intensity (p = 0.003 vs placebo) and sleep disruption (p = 0.020 vs placebo). Diarrhea, loss o...Continue Reading

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