Background: Topical therapy may provide additional
benefit in patients with painful diabetic neuropathy (PDN).
This study was conducted to study the safety and efficacy of
0.025% capsaicin gel in this condition.
Methods: A 20-week, double-blind, crossover, randomized,
single-center study enrolled subjects with PDN. They received
0.025% capsaicin gel or placebo for 8 weeks, with a washout
period of 4 weeks between the two treatments. Primary
efficacy end point was percent change in visual analog scale
(0–100 mm) of pain severity. Secondary outcomes were score
change in Neuropathic Pain Scale (NPS), short-form McGill
Pain Questionnaires (SF-MPQ), proportion of patients who
had pain score reductions of 30% and 50%, and adverse
event.
Results: Of the 35 subjects screened, 33 were enrolled and
33 completed at least an 8-week treatment period. Intentionto-treat
analysis showed no significant improvement in pain
with capsaicin gel, compared with placebo with visual analog
scale (VAS) score 28.8 mm vs. 34.6 mm (P = 0.53). No significant
difference between the groups was found in SF-MPQ
(7.4 vs. 7.71, P = 0.95), NPS (29.4 vs. 31.3, P = 0.81), and
proportion of patients who had 30% or 50% pain relief.
Capsaicin gel was well tolerated with minor skin reaction.
Conclusions: 0.025% capsaicin gel is safe and well tolerated,
but does not provide significant pain relief in patients with
PDN.
Background: Topical therapy may provide additionalbenefit in patients with painful diabetic neuropathy (PDN).This study was conducted to study the safety and efficacy of0.025% capsaicin gel in this condition.Methods: A 20-week, double-blind, crossover, randomized,single-center study enrolled subjects with PDN. They received0.025% capsaicin gel or placebo for 8 weeks, with a washoutperiod of 4 weeks between the two treatments. Primaryefficacy end point was percent change in visual analog scale(0–100 mm) of pain severity. Secondary outcomes were scorechange in Neuropathic Pain Scale (NPS), short-form McGillPain Questionnaires (SF-MPQ), proportion of patients whohad pain score reductions of 30% and 50%, and adverseevent.Results: Of the 35 subjects screened, 33 were enrolled and33 completed at least an 8-week treatment period. Intentionto-treatanalysis showed no significant improvement in painwith capsaicin gel, compared with placebo with visual analogscale (VAS) score 28.8 mm vs. 34.6 mm (P = 0.53). No significantdifference between the groups was found in SF-MPQ(7.4 vs. 7.71, P = 0.95), NPS (29.4 vs. 31.3, P = 0.81), andproportion of patients who had 30% or 50% pain relief.Capsaicin gel was well tolerated with minor skin reaction.Conclusions: 0.025% capsaicin gel is safe and well tolerated,but does not provide significant pain relief in patients withPDN.
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