St. John's Wort, Serotonin Syndrome & MAO Inhibitors: The Real Risk

This is one of the more serious documented interactions worth understanding clearly, separate from the general antidepressant caution.

Why this specific combination is a genuine concern

St. John's Wort affects serotonin pathways, and combining it with MAO inhibitors or other serotonergic medications carries a documented risk of serotonin syndrome — a real, medically significant interaction, not a minor caution.

What to actually do about it

• Never combine with MAO inhibitors without explicit medical supervision
• Tell your doctor about every medication and supplement you take, not just prescriptions
• Watch for symptoms like agitation, rapid heartbeat, or high fever if you do combine them under medical guidance
• Seek immediate medical attention if you notice any of these symptoms