Long-term cognitive and mood effects of zonisamide monotherapy in epilepsy patients.
This study was a prospective, randomized, open-label investigation of the long-term effects of zonisamide (ZNS) monotherapy on cognition and mood of patients with epilepsy. Forty-three patients with epilepsy received ZNS, with final dose groups of 100, 200, 300, and 400mg/day. Cognitive and mood tests were done twice, at baseline and 1 year after starting medication. Nine patients were withdrawn prior to their follow-up tests. Three patients (33%) dropped out during the titration period because of cognitive and mood problems. Thirty-four patients completed follow-up neuropsychological tests. After 1 year of treatment, 16 patients (47%) complained of cognitive deficits. Only 5 patients (15%) experienced mood changes. Although ZNS decreased seizure frequency and EEG abnormalities and did not elicit significant mood changes, it had negative effects on several cognitive tests. Worse performance on delayed word recall, Trail Making Test Part B, and verbal fluency was related to dose. In conclusion, ZNS has adverse effects on cognition even after 1 year of treatment.
Park
Sung-Pa
SP
Department of Neurology, School of Medicine, Kyungpook National University, Daegu, Korea. sppark@mail.knu.ac.kr
Hwang
Yang-Ha
YH
Lee
Ho-Won
HW
Suh
Chung-Kyu
CK
Kwon
Soon-Hak
SH
Lee
Byung-In
BI
D000293:Adolescent; D000328:Adult; D000339:Affect / Q000187:drug effects*; D000927:Anticonvulsants / Q000627:therapeutic use*; D003071:Cognition / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004569:Electroencephalography; D004827:Epilepsy / Q000188:drug therapy* / Q000523:psychology*; D005260:Female; D006801:Humans; D007555:Isoxazoles / Q000627:therapeutic use*; D008137:Longitudinal Studies; D008297:Male; D009483:Neuropsychological Tests; D011446:Prospective Studies; D000078305:Zonisamide
D000927:Anticonvulsants; D007555:Isoxazoles; D000078305:Zonisamide