The school psychiatrist didn't suggest talk therapy. She simply asked that I return for a "med check" every few weeks to make sure that the pills were working.

Work they did. My dread burned off like valley fog in the sun, and my tears dried up as decisively as if someone had turned off a spigot. Soon I felt less anxious and more sociable than I could ever remember being.

When I started using antidepressants, I didn't know anyone else my age who was taking them. Within a few years, I felt hard-pressed at times to find someone who wasn't. Antidepressants and other psychiatric medications went mainstream in the 1990s and 2000s, and my generation became the first to use these drugs in significant numbers as adolescents and young adults.

Young people are medicated even more aggressively now, and intervention often starts younger. In children, as in adults, antidepressants and medications for attention-deficit hyperactivity disorder are often used continuously for years. These trends have produced a novel but fast-growing group—young people who have known themselves longer on medication than off it.