I wiuld get ivermectin at tractor supply store and study whether u would also need to take some of the other horse meds as doctors are not trying to help you. Depends on what you are trying to fight you could take fenbendazole or pyrantel.poamote if it is pinworms..praziquantel has to be ordered online. You do need to know what you're dealing with. If you have the itching around the anal area that is usually a pinworm sign. But for most of these you would have to make sure that your system is running properly that your bowels are running properly. Pineapples and papaya are good for fighting them and they will also keep your bowels are moving right because you have to be careful of the liver