Avertin is a dewormer effective against gastrointestinal nematodes, including Ascaridia spp., Capillaria spp. and thread worms (Strongyloides spp.), eye worms, and lung worms. It also works against ectoparasites like ticks, lice, mites, and nasal bots in sheep and goats, cutaneous myiasis, and demodectic mange in poultry and livestock.