An antiparasitic for the treatment and control of internal parasites (nematodes or roundworms) such as: Gastrointestinal parasites (adult forms and fourth larval stage) including: Ostertargia ostertargi (including inhibited forms). Ostertagia lyrata, Haemonchus contortus, Haemonchus placei, Trichostrongylus axei, Cooperia pectinata, Coope...