For the treatment and control of mature and developing immature gastrointestinal roundworms, lungworms, tapeworms and fluke over 6 weeks in sheep and lambs. It is ovicidal against nematode eggs and delays egg laying in trematodes (fluke). In known fluke areas, parasitis infestations will generally be mixed involving nematodes, trematodes and occasionally cestodes. Treatment with the oxfendazole/closantel combination will be of particular benefit in reducing parasite burden in such areas.