Undoubtedly, the prednisone caused the oral thrush by weakening your immune system. Try eating unsweetened yogurt or taking acidophilus capsules or liquid. Yogurt and acidophilus don't destroy the fungus, but they can help restore the normal bacterial flora in your body. If this isn't effective, your doctor may prescribe an antifungal medication.
Well the yoghurt should work as a part of your diet, chlorohexadine mouth wash is another way of getting rid of the thrush, Take ur doc to task and pick it up with the drug company,they are supposed to let physicians know that when u are on any sort of inhaled or oral steroid, you must rinse your mouth regularly.
tell your doctor because i have thrush from predinsone and my doctor prescribed NYSTATIN YOU SWISH AND SWALLO FOUR TIMES A DAY AS NEEDED USUALLY TAKES A WEEK FOR IT TO COMPLETE GO AWAY