Depression strikes some 35 million people worldwide, according to the World Health Organization, contributing to lowered quality of life as well as an increased risk of heart disease and suicide. Treatments typically include psychotherapy, support groups and education as well as psychiatric medications. SSRIs, or selective serotonin reuptake inhibitors, currently are the most commonly prescribed category of antidepressant drugs in the U.S., and have become a household name in treating depression.