Table 1.

Effect of the aqueous leave extracts of S. torvum on acetic acid-induced pain.

Group	Dose (mg/kg)	Contraction ± SEM	Pain inhibition (%)
Control	-	148 ± 14	-
Aspirin	100	77 ± 8**	48
Tramadol	25	113 ± 10*	23
Morphine	1.5	58 ± 8**	61
S. torvum	300	114 ± 9*	23
S. torvum	600	110 ± 13*	26

Test groups were compared with the control group and significant differences in response were noted. * P<0.05, **P<0.01. n = 5