Is Tryptophan Safe with fluoxetine?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid taking tryptophan supplements while using fluoxetine. Speak with your healthcare provider before using any amino acid or dietary supplements.
Why this interaction occurs
Concomitant use of serotonergic substances including tryptophan with fluoxetine increases the risk of serotonin syndrome, a potentially life-threatening condition. Monitor for signs and symptoms of serotonin syndrome, particularly during treatment initiation and dosage increases. Discontinuation of fluoxetine and/or concomitant serotonergic agents may be required if serotonin syndrome occurs.
Evidence
Evidence level: strong.
Data source
FDA Drug Label
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 87,365 reports mentioning fluoxetine. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the fluoxetine + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Tryptophan interactions → · All fluoxetine interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.