A composition for use in prevention inhibition and/or treatment of coccidiosis in an animal is disclosed. The composition comprises an effective amount of Bidens pilosa an active constituent thereof or an active compound isolated therefrom. In another aspect a composition for use in preventing and/or treating coccidiosis and/or enhancing growth in an animal is disclosed the composition comprising an animal feed and an effective amount of Bidens pilosa or an isolated active constituent comprising a polyacetylenic compound.