My doctor had me on twice-a-day fluoxetine (20mg). I was on this dosage for two months and then my anxiety attacks increased. I did some research on the side effects of fluoxetine and found out that it actually can cause anxiety. So I requested my dosage be lowered to once-a-day and the anxiety attacks have lessened in frequency. I normally have them every day. Last week, I had three in a row costing me three days of work, but at least I was able to work some. I'm hopeful this upcoming week will be a tranquil one; I feel good right now because this is my off-day, but tomorrow? I don't know. I'm going to work irregardless because if I don't, then I don't have a place to live, no food, no gas money, etc.--no money coming in. Just wanted to say, if you are on twice-a-day fluoxetine and you're getting the jitters, might want to look into it.