The present study involved the design and synthesis of new substituted 4-[2-(4-
alkoxybenzylamino) ethyl]-2H-1,2,4-triazol-3(4H)-one derivatives (8a-w) starting from 1,2-
ethanediamine. The final compounds were screened for their in vivo anticonvulsant activities and neurotoxicities
by maximal electroshock (MES) and rotarod tests, respectively. Among the compounds
studied, 4-[2-(4-butoxybenzylamino)ethyl]-2H-1,2,4-triazol-3(4H)-one hydrochloride (8b) was found
by intraperitoneal administration in mice to be the most potent compound with a median effective
dose (ED50) value of 33.2 mg/kg and a high protective index (PI) value of 11.4. Compound 8b showed significant oral activity
against MES-induced seizures in mice with an ED50 value of 83.1 mg/kg and a PI of 18.1. The results demonstrated
that compound 8b possessed better anticonvulsant activity and higher safety than the marketed drug carbamazepine.
Keywords: Anticonvulsant activity, carbamazepine, maximal electroshock test, rotarod test, synthesis, triazolone.
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