What can I add to my cats food to help with vomiting. I have 7 cats and one is on prednisolone. it has helped some but not completely. He gets egg lecithin twice a day. Dry food twice a day and wet food twice a day. If they throw up its within 20 minutes of eating and they almost always want to eat right away and then keep it down. I dont know if pre or probiotics would help. Or digestive enzymes?