Help your equine feel better with Panacur Powerpac 5 Deworner for Horses. This gel is prescribed to help control common internal parasites in horses—specifically large and small strongylus, pinworms and roundworms. Panacur may also help to alleviate arteritis caused by parasites. It's safe for horses of all ages and sizes, plus comes in a unique apple-cinnamon flavor that makes administration easy—and even enjoyable—for your horse.