Ok this thread is for a dear friend of mine who has a new horse needing dewormed. He doesn't have any worms from what she can tell but its routine. I recommended Zimecterin Gold cause thats I use and haven't had a problem but she nervous cause its a new horse and she heard horror stories of reactions and stuff. The seller said he does NOT have any allergies. It was one of those sales where she bought out of state and won't hear from seller really again lol He has a clear health record. She also cannot really afford to have a vet come out and exam and give advice... I told my friend I would post this on here for her and see what ya'lls advice is?? I would probably just use Zimecterin Gold, Its worked for me but it helps to hear from other horse lovers! What would you do?!?!