Panacur Suspension works as a dewormer for the control of large strongyles, small strongyles, and pinworms. It is safe for foals and pregnant mares, older horses, thin and underweight horses or miniature horses. Panacur Suspension for Horses should be administered orally, and retreatment may be needed after 4 to 6 weeks if exposure to parasites continues.We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.