Cydectin is a dewormer indicated for the treatment of infections and infestations due to internal and external parasites in beef and dairy cattle. Cydectin is also used for the treatment and control of infections due to internal parasites in sheep. Cydectin contains Moxidectin, a medication that paralyzes and eliminates parasites. Cydectin is effective against roundworms lungworms, grubs, lice, and mites in cattle. Cydectin is also effective against 13 types of adult and larval stages of internal parasites in sheep. Cydectin is available in oral solutions for sheep and injectable solutions for cattle. Cydectin is also available in a pour-on solution for cattle with a purple dye to show which animals have been treated.