We took one of my ducks to the vet for a prolapsed vent less than a week ago (she needed stitches) and the vet told us that he believed she also had Giardiasis. He gave us some medication to treat this that we have to give her through an oral syringe, but I forgot to ask about the rest of the flock. I'm pretty sure that if she has this, some of the others do too and I have noticed that some of my ducks have had diarrhea-like poop lately. Also, she is separated right now as she heals from the prolapse. I would hate for her to get it again once she is reintroduced to the flock. The vet said that he believes the diarrhea was part of the reason she may have prolapsed. Does anyone know of an over-the-counter antibiotic that treats this? (I also have chickens in the same area that may also need treatment.) Or do I just need to call the vet and see about getting some sort of prescription for the whole flock?