Table 3.

Protective efeect of Pinus roxburghii Sarg. on writhing induced by acetic acid.

Groups	Drug (dose), route	No of wriths (Mean ± SEM)	% Protection
Control	Acetic acid (0.6% V/V), i.p	42 ± 11.6	0
Standard	Diclofenac Sodium (50 mg/kg), p.o	4.2 ± 1.0**	90
AB	100 mg/kg, p.o	25.4 ± 4.8	39.52
AB	300 mg/kg, p.o	17.4 ± 1.9**	58.57
AB	500 mg/kg, p.o	8.0 ± 2.0**	80.95

n = 5. Results are expressed as mean ± SEM. *P > 0.05, **P < 0.01 as compared to control, AB = alcoholic bark extract.