Is Tryptophan Safe with duloxetine?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid taking tryptophan supplements while using duloxetine. Consult your doctor before using any tryptophan-containing products. Seek immediate medical attention if you experience signs of serotonin syndrome such as agitation, confusion, rapid heart rate, or muscle twitching.
Why this interaction occurs
The FDA label states that concomitant use of serotonergic substances, including tryptophan, with duloxetine increases the risk of serotonin syndrome, particularly during treatment initiation and dosage increases.
Evidence
Evidence level: strong.
Data source
FDA Drug Label
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 77,020 reports mentioning duloxetine. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the duloxetine + 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 duloxetine interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.