Venlafaxine
"I've been on this medication for almost a month. My doctor told me it could easily take a month to get used to it.  I started out with headaches, extreme tiredness and excessive sweating.  The tiredness was gone after about 10 days.  The sweating is the worst side effect and I still suffer with it daily, though I am no longer dripping with sweat like I was when I began the medication.  I get occasional headaches, but nothing more than a slight headache to remind me that I have one.  I do feel better and am less stressed."