Table 2. Protective index (PI) values of sodium valproate and Nigella sativa seed constituents against MES- PTZ-induced convulsions.

Treatment	SVP	AE	FO	VO	TQ (CMC)	AP	PC
PTZ model PI = TD50/ED50	1.13	0.48	< 0.22	0.81	0.95	< 0.39	0.93
MES model PI = TD50/ED50	1.07	_	_	0.43	_	_	0.34

SVP = Sodium valproate, AE = Aqueous extract, FO = Fixed oil, VO = Volatile oil, TQ = Thymoquinone, AP = α-pinene, PC = p-cymene.