Ivermectin Paste 1.87 percent is a broad spectrum antiparasitic treatment for horses that controls and eliminates a wide range of internal and external parasites. It is effective against large and small strongyles pinworms ascarids hairworms stomach worms bots lungworms intestinal threadworms summer sores and certain parasite related dermatitis. The apple flavored oral paste is easy to administer and provides reliable comprehensive parasite control in a single dose when used as directed.