Table 3.

Determination of the analgesic activity of derivatives of flurbiprofen by the acetic acid-induced writhing method in mice

Experimental groups	Number of writhes ± SEM	Percentage inhibition (%)
Control	59.83±3.77	0
Standard	18.500±1.50***	69
4a	34.16±1.97***	42
4b	15.17±3.17***	75
4c	41.83±6.67*	30
4d	19.83±3.95***	67

Notes: Results are expressed as mean ± SEM.

^*P=0.05,

^***P=0.001.

Abbreviation: SEM, standard error of the mean.