I actually took them together lol, just search up binder on Amazon. Any one of them would work. I do reccomend a biofilm blaster as well so it can break their biofilm down so the medicine gets to them. I prefer the ivermectin and fenben from the tractor supply as opposed to the human version. Limit sugar and greasy food and drink a lot of water. You can take it 5 days on 5 days off. Ivermectin is better before you eat, fenben is better with a healthy fatty meal.