Analgesic and anti-inflammatory effects of aqueous leafextract of Combretum micranthumg. Don (Combretaceae)

The analgesic and anti-inflammatory effects of the aqueous leaf extract of Combretum micranthum were studied in mice and rats. The extract was screened for analgesic activity; using acetic acid induced writhing in mice and formalin induced paw licking test in rats. Anti-inflammatory effect was evaluated using formalin induced hind paw oedema in rats. Results showed that, at a dose of 200 mg/kg the extract significantly (p < 0.05) reduced the number of abdominal constrictions in mice and at doses of 100 and 200 mg/kg, the extract significantly (p < 0.05) reduced the licking time in rats in the formalin induced paw licking test. The extract at doses of 50,100 and 200 mg/kg significantly (p < 0.05) reduced hind paw oedema in rats from the first hour of formalin administration. The intraperitoneal LD50 value of the extract was found to be 2,154.1mg/kgin mice and 2,852.l mg/kg in rats. The analgesic and anti-inflammatory activities of the plant extract may probably be due to the presence of phytochemical contents.Keywords: Combrentum micranthum, Analgesic, Anti-inflammatory, Mice, Rats.