Over the past several months I have been taking Welbutrin. I first started out on 150mg and slowing increased my dose to 450mg. Within 1 month after taking the 450mg I began to lose my hair. In fact, I lost almost half of it before I realized that it was the welbutrin. I stopped taking it and my hair has begun to grow back. What disturbs me is that when I obtained the drug from the pharmacy it never listed hair loss as a potential side effect.