About 16 million Americans experience a major depression each year, and at any given time about ten percent of the population is taking antidepressants. The popularity of antidepressants is increasing rapidly: there are about four times as many people taking them than in the 1990s. There are many different ones available, in what can seem like a bewildering variety. In this book, Dr. Mendelson suggests that understanding the science of how antidepressants...