I took Prozac in my early 20's, went manic....told my doctor about the manic symptoms and he switched me to Paxil, I went manic, made some of the poorest life choices of my exsistence and was too scared to try meds again until an attempt several years later where I was clearly manic, they gave me Paxil and it happened all over again. I don't know if that long ago they didn't know about bipolar and SSRI's or if my doctors were poorly trained because I feel this never should have happened and I should have been warned about the possibility. I also went manic on Wellbutrin which is an SNRI I believe and again, I was not warned this could happen, even though I had a bipolar DX at the time. This was so long ago that I do not know how long it took for the symptoms to start, all I remember was how bad it was. Wellbutrin causes me to swing up rather quickly....within a week.