This disclosure relates to a method of treating depression and/or reducing risk of suicide, comprising administering a combination of about 90 mg to about 120 mg of bupropion hydrochloride, or a molar equivalent amount of another form of bupropion, and about 40 mg to about 50 mg of dextromethorphan hydrobromide, or a molar equivalent amount of another form of dextromethorphan. The combination may be administered twice a day to a human being suffering from major depressive disorder and having a score of 3 or greater on the Suicidality Item of the Montgomery-Åsberg Depression Rating Scale (MADRS-SI).