Am I depressed or just unhappy? In the last two decades, antidepressants have become staples of our medicine cabinets--doctors now write 120 million prescriptions annually, at a cost of more than 10 billion dollars. At the same time, depression rates have skyrocketed; twenty percent of Americans are now expected to suffer from it during their lives. Doctors, and drug companies, claim that this convergence is a public health triumph: the recognition and treatment of an under-diagnosed illness. Gary Greenberg, a practicing therapist and longtime depressive, raises a more disturbing...