I take buproprion (generic Wellbutrin) 300mg XL. I had some side effects that didn't start until four weeks into usage. I would feel lightheaded for a couple of hours and it was usually followed by a minor headache. I started taking the meds at night instead of in the morning, and noticed immediately that the side effects seriously diminished. After about two and a half months of usage, I am happy to say Wellbutrin is working really well for me. It seems to keep me focused, energetic, able to maintain a healthy routine of eating right and exercising everyday. It also keeps me from drinking and or smoking regularly, two habits I am glad to be free of. The only side effect I get now is a positive one, and that's that I am horny as all get out... seriously, its getting me in trouble!