Valproic acid has no effect on pain in polyneuropathy: a randomized, controlled trial.

Otto, Marit; Bach, Flemming W; Jensen, Troels S; Sindrup, Søren H · Neurology · 2004

rct · Level II

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Abstract

The aim of this randomized, double-blind, placebo-controlled cross-over study was to test whether valproic acid relieves painful polyneuropathy. Thirty-one patients completed two treatment phases of 4 weeks' duration with valproic acid (1,500 mg daily) and placebo. There was no significant difference between valproic acid and placebo in the rating of total pain (median, 5 in the valproic acid period vs 6 in the placebo period; p = 0.24) or in individual pain ratings.

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