medication used to treat and control internal parasitic worms (helminths) in animals, such as livestock and pets. These drugs work by killing or stunning the parasites without causing significant harm to the host animal. Key chemical classes include benzimidazoles, imidazothiazoles, and macrocyclic lactones, but widespread resistance to these drugs is a significant issue, necessitating careful and judicious use and the development of new anthelmintics.
