Anthelmintic activity of the crude methanol extract of Xylopia aethiopica against Nippostrongylus brasiliensis in rats

Xylopia aethiopica A. Rich (X. aethiopica; Annonaceae) is used commonly in Nigeria by traditional herbalists and pastoralists to control gastrointestinal helminth parasites. The anthelmintic effect of the crude methanol extract was evaluated in rats experimentally infected with the rat hookworm Nippostrongylus brasiliensis. Thirtyfi ve rats were each infected subcutaneously with 200 third stage infective larvae of the parasite and randomly grouped into seven groups. Five days after infection, rats in siof the groups were treated with the extract, the dose varying per group. Rats in the seventh (control) group were each given propylene glycol. Anthelmintic activity was assessed by comparing the number of worms recovered from treated rats to those from non-treated infected control rats. The extract at the dose of 0.8 g/kg, 1.0 g/kg, 1.2 g/kg, 1.4 g/kg, 1.7 g/kg and 2.0 g/kg produced deparasitization rates of 21%, 47%, 51%, 50%, 63% and 76% and were signifi cant (P>0.05) when compared to untreated control rats.