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The present study is objected to evaluate the anticonvulsant activity of the phosphodiesterase III inhibitor cilostazol in the animal model of epilepsy. Conventional anti-epileptic rodent models like Maximal Electric Shock (MES)- induced convulsions and Pentylenetetrazol (PTZ) induced convulsions were used. The animals were randomly divided into six groups, with six rats in every group. Here anti-epileptic activity of cilostazol with two different doses (10 mg/kg i.p and 20 mg/kg i.p) was compared with standard drug and standard drug + Cilostazol two different doses (10 mg/kg i.p and 20 mg/kg i.p). Cilostazol (20 mg/kg i.p) exhibited an anticonvulsant effect in MES-induced and PTZ induced convulsion models over the Control group and cilostazol (10 mg/kg i.p). Standard drugs were shown superiority in seizure suppression activity than cilostazol (20 mg/kg i.p). The time duration of onset of clonic convulsion and period of clonic convulsions in PTZ induced convulsion were increased and decreased respectively when compared to Standard drug + cilostazol both doses and standard drug alone. Phenytoin abolished convulsions induced by MES- convulsion model. So the present study established that cilostazol has low anticonvulsant efficacy in comparison with conventional drugs (Phenytoin and Sodium Valproate). The potentiating effect of cilostazol with standard drugs was also demonstrated.
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