<prompt> Prolonged use of one of the following anticonvulsant drugs can produce weight loss:GabapentinOxcarbazepineTopiramateValproic acid  <response>: 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 