The selective serotonin reuptake inhibitors have a very favorable safety profile. However, because of the wide use of this drug group, even low-frequency adverse effects become more prevalent. This article reviews 5 of these relatively infrequent adverse medical effects associated with the use of selective serotonin reuptake inhibitors: the syndrome of inappropriate antidiuretic hormone secretion, extrapyramidal effects, bleeding complications, cardiac arrhythmias, and the serotonin syndrome.