At this time, the only synthetic parasiticides allowed for organic producers are ivermectin, moxidectin, and fenbendazole. You may only use these synthetic drugs for emergency treatment of dairy animals and breeder stock. Animals to be sold as organic slaughter stock may never be treated with these materials. Plant-based, herbal de-wormers and other non-synthetic materials are also allowed as parasiticides.
Use MyCCOF: Materials Search to find and add materials approved for use in organic production or to request the review of a material you would like to use.