insomnia
"This medication knocked me out every night and so it was great to catch up on years of sleep debt.  Overall, a very positive experience.  However, like other users, I slowly gained 10-20 pounds over the course of taking doxepin. I stopped taking it in the last couple of months, and suddenly, my appetite significantly decreased and weight just started dropping off. I had no idea that the medication caused this increased appetite/weight gain. Honestly I thought I was just growing older and my metabolism was changing. I'm glad I took this medication for insomnia, and also that the side effect of weight gain faded away as soon as I stopped taking it. Overall, the value of the sleep I gained far outweighed the con of the weight I gained."