Preperation h is an over the counter ointment for hemorrhoids that you can buy at the pharmacy or grocery store. Each time after applying it, it will start shrinking a prolapsed rectum back up into a bird. I have used it twice on a cockatiel and a baby chick. It was effective both times. A prolapsed rectum is life threatening to a bird. Our cockatiel was having difficulty breathing and near death and it saved him. After the first application of it on Larry, our cockatiel, he would turn around on his perch when he saw and smelled the q-tip with the ointment on it and stick his butt up toward my face. He remembered that it took his pain away and really enjoyed it after that! LOL! Now, I keep prep h in my emergency chicken kit.