That's what they do.
They're not "happy pills", as many people assume.
( Dave Trouser ; the people's choice - 75% agree, Mon 15 Jun 2009, 14:56, archived)

Yeah,
actually I thought that felt worse. I almost completely stopped functioning when I was on them, I'd just sit for hours staring at the wall because I didn't care about anything enough to do anything, and I really couldn't see how my life was ever going to improve like that. If you want to change things, you've got to care about them. When I eventually stopped them, it was like suddenly I could think again!
( Moon Girl Technologies horrendous beanbag, Mon 15 Jun 2009, 15:00, archived)