depression
"SSRI's meant no orgasms and didn't help me sleep. No such problems with mirtazapine. Sex is even better, sleep is wonderful and I get enough and can function within minutes of getting out of bed.  I get brain zaps at sudden noises if I'm relaxed, and it increases my appetite a lot.  Thankfully I've taken up distance running at the same time. You must exercise on this medicine to overcome the weight gain, which is it's worst side effect. All up this medicine has been wonderful and after horrible experiences with SSrI's I'm glad to be on it.  Found out afterwards that my girlfriend is also on it for insomnia."