The present study examined the anticonvulsant activity of the methanol stem bark extract of PK in mice and day old chicks against maximal electroshock (MES), pentylenetetrazole (PTZ), picrotoxin (PIC), and strychnine (STR) induced seizures. The CNS depressant ability of the extract was also investigated using diazepam-induced sleep test, and it was observed to significantly and dose dependently increase the sleep duration in the diazepam sleep test. The extract and fractions significantly and dose dependently increase the latency to onset of seizure in the PTZ and picrotoxin tests. In the strychnine test, the extract significantly increased the latency to seizure onset at the highest dose of 200 mg/kg, though none of the mice was protected from seizure as was the case with PTZ and PIC induced seizures. Considering the overall effect of PK, it may be concluded that the extract contains bioactive principles acting via enhancement of GABA inhibitory activity, and a second possibility via antagonism of the glutamate-NMDA receptors