In the Tail Flick method the prescreened animals (reaction time: 3-4sec) were divided into groups as that of writhing test. Pentazocine (30mg/kg) was used as standard. The tail flick latency was assessed by the analgesiometer. The strength of the current passing through the naked nichrome wire was kept constant at 6 ampere. The distance between the heat source and the tail skin was 1.5 cm. The site of application of the radiant heat in the tail was maintained at 2.5 cm measured from the root of the tail. The cut-off reaction time was fixed at 10 sec to avoid damage. The observations were recorded and tabulated in Table 3.