How long does a steroid (prednisolone) stay in the cat's system after stopping? My senior girl, Kiki, was prednisolone 5mg. daily for several years for IBD until she became diabetic. We have weaned her off the steroid a week ago and is now getting Cerenia every other day for vomiting. How long before the steroid is out of her system and we might see a change in her blood sugar? Thanks!