Discount Pet Care: MecWorma And Bot For Horses is a wonderfully crafted broad-spectrum worm paste. It is a single active \'mectin\' oral anthelmintic that aids in the proper and thorough control of large strongyles, small strongyles, ascarids (including adult and immature), pinworms, hairworms, lungworms, bots, intestinal threadworms, neck threadworms, and large mouth stomach worms.