When I was a college freshman in the late 1990s, antidepressants were everywhere. Prozac was appearing on magazine covers, and I'd just seen my first commercial for Paxil on TV. Halfway through the semester, I was laid out by a prolonged anxiety attack and found myself in the school's campus health center, tearfully telling a newly minted psychiatry resident about my feelings of panic and despair. Given the spirit of the times, it wasn't a complete surprise when she sent me away a few minutes later with a prescription and a generous supply of small cardboard boxes full of beautiful blue pills,...