Check out [link|http://www.fda.gov/cder/drug/infopage/accutane/accutane_psychdisorders.htm| FDA Center for Drug Education and Research]
Accutane may cause depression, psychosis and, rarely, suicidal ideation, suicide attempts and suicide. Discontinuation of Accutane therapy may be insufficient
I think a better question might be, why is something with those side effects used as acne medication?
Jay