Which statement about serotonin syndrome is true?

Which statement about serotonin syndrome is true?

• A. It results from excess serotonin activity in the CNS.
• B. It results from serotonin deficiency.
• C. It is caused by GABA deficiency.
• D. It is only a concern with MAO inhibitors.

Answer: (A)

Serotonin syndrome arises from excessive serotonergic activity in the central nervous system, usually after combining multiple drugs that increase serotonin or taking an overdose. This overactivation, especially at 5-HT receptors such as 5-HT2A, produces a characteristic mix of mental status changes (agitation or confusion), autonomic instability (tachycardia, hypertension, sweating, fever), and neuromuscular hyperactivity (hyperreflexia, clonus). That’s why the statement about excess serotonin activity in the CNS is true. It’s not about serotonin deficiency, and GABA deficiency isn’t the mechanism. While MAO inhibitors can contribute, serotonin syndrome is not limited to them—many serotonergic drug combinations can trigger it, and stopping offending agents with supportive care is the key approach.

Serotonin syndrome arises from excessive serotonergic activity in the central nervous system, usually after combining multiple drugs that increase serotonin or taking an overdose. This overactivation, especially at 5-HT receptors such as 5-HT2A, produces a characteristic mix of mental status changes (agitation or confusion), autonomic instability (tachycardia, hypertension, sweating, fever), and neuromuscular hyperactivity (hyperreflexia, clonus). That’s why the statement about excess serotonin activity in the CNS is true. It’s not about serotonin deficiency, and GABA deficiency isn’t the mechanism. While MAO inhibitors can contribute, serotonin syndrome is not limited to them—many serotonergic drug combinations can trigger it, and stopping offending agents with supportive care is the key approach.