['To collect data on sexual dysfunction in a larger population of male patients with epilepsy treated with oxcarbazepine in a naturalistic setting.', 'Six hundred seventy-three adult male patients with partial epilepsy in whom monotherapy with oxcarbazepine was indicated were evaluated at baseline and after approximately 12 weeks of treatment with regard to the number of seizures and occurrence of any adverse drug reactions. All patients were questioned regarding their sexual function.', 'Out of 228 patients with pre-existing sexual function impairment at baseline, an improvement was observed in 181 (79.4%) patients, 23 (10.1%) patients experienced no impairment at the final visit. The improvements were more marked in those patients, who were pretreated with enzyme-inducing antiepileptic drugs. No worsening of the sexual dysfunction was observed.'] Does oxcarbazepine treatment in male epilepsy patients improve pre-existing sexual dysfunction?