I have been on Welbutrin for about 4 months. In the last two months, I have noticed my hair thinning. I got off the Welbutrin for about 3 weeks, and I did not notice losing as much hair, but when I started taking it again, I, once again had more hair loss. When I started taking it the second time, I took a lesser dose. My doctor started me on 150mg., and later upped it to 300mg. It was after the increased dosage that I really noticed the problem occuring. I would like to know if people on the 150mg. have noticed hair loss?