My Uro just recommended I start taking this. I tried it 15 yrs ago for my FM, I had a side effect of shaking. As I look back on it I think the shaking was from the FM as I still have some of that. I was taking a bigger dose then 5 mg. The main thing I read about was getting used to waking up so tired. I would like knowing how long it took for most people to get used to the drug. Also how soon would I know if I had a nasty side effect.