Selective serotonin reuptake inhibitor
SSRIs also work well for obsessive-compulsive disorder (OCD).  They are the first-choice treatment for people with very bad OCD.  Like with depression and generalized anxiety disorder, SSRIs are not a cure; people need to participate in counseling and other treatments too.  However, people with OCD who took an SSRI are about twice as likely to do well in treatment than people not taking an SSRI.