For those who wonder about the effectiveness of antidepres sants, the Southwest Alliance for the Mentally Ill will present a talk exploring that question April 21 The session will begin at 7 p.m. at the Pilgrim Faith United Church of Christ, 9411 S. 51st Ave., Oa k Lawn. The guest speaker, Dr. Donna Dobrowolsky of the Oak Brook Behavioral Health Center, will explore current theories about depression and how it is linked to biochemistry, genetics and envi ronmental factors. She will offer advice on treatment processes. SWAMI provides support, edu cation and advocacy for people with brain disorders and their families. More information about the event is at (708) 425-0925 or 952-0920.