I have had rheumatoid arthritis for several years and when I have a flare I have to take a 5 day treatment of prednesone. I was diagnosed with diabetes in September and this is my first round since then. My BG has gotten very high, 325, but it is 90 first thing in the morning. I take 25 units of lantus at bedtime. I have lost weight, on a low carb diet and I walk. I called the doctor and he said since it is so short term, I should be OK just doing with I normally do and it will go back down after the treatment. I live in Central America in a country named Belize and most drugs are over the counter so I thought I might need an interim med for this but I am so thankful that I don't have to do anything different and it isn't a big concern to the doctor in the USA.