Millions of patients take antidepressant medications in the United States for the treatment of depression or anxiety disorders. Some antidepressants are prescribed off-label to treat problems such as chronic pain, low energy, and menstrual symptoms. Antidepressants are a broad and expansive group of medications, but the more common drug classes include tricyclic antidepressants, selective serotonin reuptake inhibitors, serotonin-norepinephrine reuptake inhibitors, and monoamine oxidase inhibitors. A miscellaneous or “atypical” category covers other agents. Some herbal supplements that claim to have antidepressant activity will also be discussed. Part I of this series reviewed antidepressant pharmacology, adverse effects, and drug interactions with adrenergic agonists. In part II, drug–drug interactions with sedation and general anesthetics, bleeding effects, and serotonin syndrome will be discussed.

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