This double-blind, placebo-controlled study investigated the efficacy and tolerability of adjunctive topiramate in 86 elderly Chinese patients with refractory partial epilepsy. Patients who had at least four seizures per 4 weeks during an 8-week baseline period, despite medication with up to three standard antiepileptic drugs (AEDs), were randomly assigned to receive topiramate (n = 46) or placebo (n = 40). Topiramate dosages were titrated (target dose 200 mg/day orally) for 8 weeks and maintained at stable levels for another 12 weeks; concomitant AEDs continued at original dosages. All patients completed the study: 47.8% in the topiramate group and 7.5% on placebo reached ≥ 50% reduction in complex partial seizures. In the topiramate group, the most common adverse events were dizziness, somnolence, fatigue, headache and difficulty with memory; most events were transient and mild or moderate in severity. It was concluded that 200 mg/day topiramate was effective and well-tolerated in elderly patients with refractory partial epilepsy.
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