Long-term effectiveness and side effects of acetazolamide as an adjunct to other anticonvulsants in the treatment of refractory epilepsies.
The long-term effectiveness of acetazolamide (AZA) and its side effects, especially the formation of renal calculi, were investigated in a prospective study when AZA was used as an adjunct to other antiepileptic drugs in the treatment of refractory epilepsies. The subjects comprised 37 patients aged from 1 to 17 years (mean age, 8 years and 1 month) whose seizures were hard to control with the use of two or more drugs among sodium valproate, carbamazepine and clonazepam. Thirty-two of the 37 patients were complicated with mental retardation. A daily dose of 10mg/kg of AZA was first administered and then the dosage was increased up to 20mg/kg based on the clinical response and side effects. The maintenance daily dosage of AZA (12.2+/-4.2mg/kg) produced a steady-state plasma concentration of 6.2+/-4.5 microg/ml. Among the 37 patients, complete seizure control for more than 3 years was obtained in four patients. Although there were no significant differences, all of the four patients were classified as having symptomatic localization-related epilepsies. Seizures recurred in five after complete remission for at least 6 months, and six showed >50% decrease in seizure frequency for more than 6 months after the introduction of AZA. Twenty-eight patients, who were taking AZA for 10 months to 14 years (mean, 6 years and 5 months), were examined for the formation of renal calculi. None of them showed evidence of renal calculi. This study reinforces the idea that AZA may be a useful adjunct drug in selected patients with refractory symptomatic localization-related epilepsies.
Katayama
Fumihiko
F
Department of Pediatrics, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan. fkara@t3.rim.or.jp
Miura
Hisao
H
Takanashi
Sakae
S
D000086:Acetazolamide / Q000009:adverse effects* / Q000627:therapeutic use*; D000293:Adolescent; D000927:Anticonvulsants / Q000009:adverse effects* / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D004359:Drug Therapy, Combination; D004827:Epilepsy / Q000188:drug therapy*; D005260:Female; D006801:Humans; D007223:Infant; D007669:Kidney Calculi / Q000139:chemically induced*; D008297:Male; D011446:Prospective Studies; D016896:Treatment Outcome
D000927:Anticonvulsants; D000086:Acetazolamide