Dr. John Halpern

John H. Halpern, M.D., is an assistant professor of psychiatry and the associate director of Substance Abuse Research, Biological Psychiatry Laboratory at Harvard Medical School-McLean Hospital, Belmont, MA.Harvard Medical School and director of the Laboratory for Integrative Psychiatry at McLean Hospital, Belmont, Massachusetts.

Ask the Experts: Cluster Headaches and Hallucinogenic Drugs

Q:"I suffer from extremely painful cluster headaches. I've read that some people have turned to hallucinogenic drugs to find relief. Do these drugs work...