The vet perscribed Pyrantel for one hen, and now they are all coughing and looking like crud, so they are all getting it. But NOT at $100 a bird! I have found it at Walgreens in the form of Reese's Pinwirm Medecine for humans, and also at Pet-Co as a treatment for dogs. Same stuff. But what I want to know is, how much do you give a chicken? All help is definintely appreciated. Thanks!