Abstract:
PURPOSE:To evaluate the anticonvulsant profile and behavioral toxicity of rufinamide in animal seizure models compared to the established antiepileptic drugs (AEDs): phenytoin, phenobarbital, valproate, and ethosuximide, or vehicle. METHODS:In acute studies of anticonvulsant efficacy, the AEDs were administered via oral (CF1 mice and Sprague-Dawley rats) and intraperitoneal (CF1 mice) routes. The AEDs were assessed for their ability to inhibit seizures induced by maximal electroshock (MES) or subcutaneous pentylenetetrazol, and ability to block seizures induced by subcutaneous strychnine, bicuculline, or picrotoxin. Tolerance of oral rufinamide was assessed in rats following 5-day (versus single-dose) treatment with oral rufinamide using the dose equivalent necessary to achieve a 50% decrease in seizure frequency (ED(50)). Metabolic tolerance was also evaluated using an in vitro liver microsomal assay. RESULTS:Oral rufinamide suppressed pentylenetetrazol-induced seizures in mice (ED(50) 45.8 mg/kg) but not rats, and was active against MES-induced tonic seizures in mice (ED(50) 23.9 mg/kg) and rats (ED(50) 6.1 mg/kg). Intraperitoneal rufinamide suppressed pentylenetetrazol-, bicuculline-, and picrotoxin-induced clonus in mice (ED(50) 54.0, 50.5, and 76.3 mg/kg, respectively). Rufinamide was partially effective in the mouse strychnine test. The behavioral toxicity of rufinamide was similar to or better than established AEDs tested in this study. In general, the protective index of rufinamide was greater than that of the other AEDs. CONCLUSIONS:The efficacy and behavioral toxicity profiles in these animal models suggest that rufinamide may be effective in the treatment of generalized and partial seizures.
journal_name
Epilepsiajournal_title
Epilepsiaauthors
White HS,Franklin MR,Kupferberg HJ,Schmutz M,Stables JP,Wolf HHdoi
10.1111/j.1528-1167.2008.01552.xsubject
Has Abstractpub_date
2008-07-01 00:00:00pages
1213-20issue
7eissn
0013-9580issn
1528-1167pii
EPI1552journal_volume
49pub_type
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