I have been on prednisone for almost a year having started at 20mg. for Polymyalgia rhumatica. During this time I have had 2 hip replacements and have managed to reduce the prednisone as of a week and a half ago to 5mg. Its been a very slow reduction. This is the first time I have experienced this uncontrolable shivering and shaking... at night a few times and once in the morning. I am wondering if this could be my body adjusting to the one half pill lower dose? Has anyone experienced this effect? Thank you for looking.