Epileptiform seizures in domestic fowl. VIII. Anticonvulsant activity of primidone and its metabolites, phenobarbital and phenylethylmalonamide

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Abstract
Primidone is an effective anticonvulsant against seizures induced in epileptic fowl by exposure to intermittent photic stimulation. Epileptic fowl metabolize primidone to phenobarbital. Pretreatment of epileptic fowl with SKF 525A to prevent the metabolism of primidone to phenobarbital indicated that primidone itself had anticonvulsant activity. Phenylethylmalonamide, a second metabolite of primidone, did not have anticonvulsant activity when administered at the same dose as primidone.