The proper treatment for steroid-induced diabetes is to stop or reduce the steroids, barring a life-sustaining or other very serious reason to take them. Dexamethasone is 15 times stronger than prednisone.
Your glucose should normalize in a week or so. If it's still elevated, you were heading there anyway regardless of the steroids.
San Francisco Area
ESR'd March 2010. FIRE'd January 2011.
As if you didn't know..If the above message contains medical content, it's NOT intended as advice, and may not be accurate, applicable or sufficient. Don't rely on it for any purpose. Consult your own doctor for all medical advice.