osgev -One of the side effects I have had with Welbutrin SR (sustained release) was a little drowiness when I first started taking it. I take it at night so I don't notice that anymore. It also tends to make you a little constipated, which as a D/C I did not mind too much. I started on 100mg but when I increased the dosage to 200mg, I became a little too C for my liking. I told my doctor about this and he agreed that I could cut back to the lower dosage.Whatever you decide to take, start out slowly and, if you need to, work up to the higher doses.------------------M�dchen