Mirtazapine
"After being on Ambien for years, at least years, for sleep, I decided I hated the mental fog.  My doctor prescribed Remeron. After several months of weight gain, I decided I had to lose the weight. I'm 6'5" and I went from 310 LBs to 360 LBs in a matter of three months. Crazy, I know!
What I couldn't figure out was why I had an insatiable hunger. How bad was it? Usually, when I go out for wings, I order a ten piece. If I share an appetizer, I only eat 4; take 6 home for the next day. A few weeks ago, even after sharing an appetizer, I ate all ten wings, and when I got home I ate my wife's leftovers! So I ran out of Remeron and didn't get it refilled. After four days of being off it, my appetite is normal. Awful RX!!!"