Did Mark Barton, for example, kill his family and co-workers because he was on Prozac orwhile he was on Prozac?

Yes, sometimes people on antidepressants kill themselves or act violently, she says, but that's because "you're already dealing with people who are prone to violent behavior." And, she says, "people who are depressed are going to be at greater risk of hurting themselves."

Sometimes, concedes University of Utah psychiatry professor Dr. David Tomb, "some people will briefly feel more suicidal" when they're first put on antidepressants, but that happens when they first go into psychotherapy, too, he argues, "or just because they're getting better by tincture of time." Tomb, like a lot of people in the field, offers this explanation: A really depressed person may not have the energy to kill himself; then he starts taking medication, still feels depressed, but suddenly has enough energy to follow through with his suicidal thoughts.

But what about the people who weren't suicidal until they took the drugs, Tracy asks. What about the people who had no history of violence but then killed their own children?

FDA weighs in