Prolonged use of one of the following anticonvulsant drugs can produce weight loss:
Adverse effects are impairment of attention, sedation , ataxia, word finding difficulty, poor memory, weight loss, paresthesia and renal stones. All the other drugs donot cause weight loss. Ref: K D Tripati 8 th edition
Gabapentin
Oxcarbazepine
Topiramate
Valproic acid
Central Nervous system