The effects of adjunctive topiramate on cognitive function in patients with epilepsy

Suzee Lee, Viviane Sziklas, Frederick Andermann, Sara Farnham, Gail Risse, Mary Gustafson, John Gates, Patricia Penovich, Abdullah Al-Asmi, Francois Dubeau, Marilyn Jones-Gotman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

153 Citations (Scopus)


Purpose: We investigated possible cognitive effects of topiramate (TPM) in polypharmacy on patients with intractable epilepsy. Methods: Study 1 evaluated 22 consecutively admitted patients whose antiepileptic drugs (AEDs) on admission to the Montreal Neurological Hospital included TPM. Performance on neuropsychological tests administered on and subsequently off TPM was analyzed. Four patients also were tested before taking TPM, allowing comparisons off, then on, and then off the drug again. Measures included intellectual function, verbal and nonverbal memory, language, word and design fluency, somatosensory sensitivity, and motor skills. In Study 2, 16 patients at the Minnesota Epilepsy Group were tested first off, then on TPM with nine cognitive tasks that measured concentration, verbal fluency, language, and psychomotor speed. Results: In Study 1, significant (p ≤ 0.01) improvements were observed off TPM on 13 measures including verbal and nonverbal fluency and certain verbal and perceptual tasks. Notably, verbal learning and memory were unaffected; a limited effect was observed on nonverbal memory. Patients tested 3 times scored better in both tests off TPM compared with on this drug. In Study 2, declines on TPM were observed on all measures, significantly (p ≤ 0.05) for tests of fluency, sustained concentration, and visual motor processing speed. Conclusions: TPM was associated with declines in fluency, attention/concentration, processing speed, language skills, and perception; working memory but not retention was affected. As the two studies used an opposite order of testing on versus off TPM, our results clearly show a performance decrement while patients are taking TPM, without respect to which condition is tested first.

Original languageEnglish
Pages (from-to)339-347
Number of pages9
Issue number3
Publication statusPublished - Mar 1 2003


  • Antiepileptic drug
  • Cognition
  • Human
  • Neuropsychology
  • Topiramate

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


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