I wanted to stay on mitotane longer, but the side effects were terrible. I was actually afraid to go off of it, because I didn't want my cancer to comeback, but my body could not handle the drug. I was very weak , losing weight and terrible brain fog. I still take prednisone and probably will for the rest of my life, I was on a higher dose, but now I take 5mg daily. No I have never heard of slow released cortisone. Praying for good news on your ct scan.