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Lamotrigine in the treatment of painful diabetic neuropathy.
European Journal of Neurology 1998 March
An open trial was conducted to study the potential efficacy of lamotrigine, a novel antiepileptic agent that blocks voltage-sensitive sodium channels and inhibits the release of glutamate, in relieving the pain associated with diabetic neuropathy. Subsequent to a 1 week washout period from previous analgesics, lamotrigine was administered at a dose of 25 mg/day for 1 week. The dose was doubled on a weekly basis up to 400 mg/day over 6 weeks. The McGill pain questionnaire (MPQ), spontaneous pain and a series of mechanical and thermal stimuli-induced pain were measured with the use of 0-100 visual analogue scale (VAS), on seven office visits. Pain level was also recorded by each patient twice daily, 1 week before, during, and 2 weeks after the treatment period with the use of a 0-10 numerical pain scale (NPS). Quantitative mechanical (Von Frey filaments) and thermal testing (QTT), and routine blood tests were performed at the beginning and at the end of the study. Thirteen patients completed the study. Spontaneous pain measured by VAS and NPS gradually dropped from a baseline of 49 +/- 8 and 6.8 +/- 0.6, to 20 +/- 8.6 (p < 0.001) and 4.3 +/- 0.9 (p < 0.001), respectively, at the end of the treatment period. Similarly, cold allodynia dropped from 38 +/- 9.2 to 16 +/- 15.3 (p = 0.01), and the MPQ score from 13.6 +/- 0.8 to 11.0 +/- 1.5 (p < 0.01). In contrast, no significant changes were found in the QTT, mechanical pain thresholds and laboratory results. Two patients were withdrawn from the study because of adverse effects. A long-term follow up showed that most patients were still using lamotrigine 6 months after the end of the study. The results of the study suggest that lamotrigine is potentially effective and safe in treating painful diabetic neuropathy. Copyright Rapid Science Ltd
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