I recommend corrid (amprolium) after reading these forums it's the best. Plus it's used in the medicated start and grow. Search this website for corrid or amprolium and see what you find. Speckled hen on this forum / a moderator I believe is very knowledgeable. Sulmet is cheap and more readily available but is mode of action is not so good for the chicken. Been a while since I read up on the topic but I remember what to use after trial error and lots of pouring over this forum. So now I keep it all stocked in my first aid bag. A user by the name of "dlhunicorn" is super knowledgable as well. If she doesnt come up in the searches try the first 3 letters in her user name in different order. She has a blog where she stores articles on all things chicken. Feel free to message me anytime. I am no expert in my own right but in the beginning of my chicken keeping I spent hours on this website. Ive had to treat cocci, bumble foot, torn spurs, worms, enteritis from cocci and worms. Pest like lice and mites. And euthanize from hawk attacks.