What kind of interaction is it?

Contraindicated: the two should not be combined; the risk outweighs any benefit.

Is this interaction backed by published research?

Yes. NutriStack lists 2 citation rows for the 5-HTP + Vortioxetine pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Prescription·contraindicated·Moderate evidence

5-HTP + Vortioxetine

Q: Can I take 5-HTP and Vortioxetine together?

No. 5-HTP and Vortioxetine are contraindicated together. 5-HTP is a direct serotonin precursor. Combining it with vortioxetine can produce excessive serotonergic activity and serotonin syndrome.

Q: How does this affect a NutriStack Stack Score?

-25 to your Stack Score per scored contraindication row.

Contraindicated Moderate evidence

5-HTP is a direct serotonin precursor. Combining it with vortioxetine can produce excessive serotonergic activity and serotonin syndrome.

Supplement × Prescription

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

5-HTP and Vortioxetine

Pair type

Contraindicated

Evidence

Moderate

Source citations

Scope

Supplement × Prescription

Last verified

June 4, 2026

ContraindicatedModerate evidence

What is happening. 5-HTP is a direct serotonin precursor. Combining it with vortioxetine can produce excessive serotonergic activity and serotonin syndrome.

Mechanism. Vortioxetine increases serotonergic signaling while 5-HTP increases serotonin synthesis, producing additive serotonin excess.

Recommendation. Avoid 5-HTP while taking vortioxetine unless specifically directed by a specialist; seek urgent care for fever, agitation, sweating, tremor, clonus, or confusion.

Stack Score

How it moves the number.

Effect on the composite score

If both 5-HTP and Vortioxetine are in the same stack, this pair applies −25 to your Stack Score (per scored contraindication row).

The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Takeda Pharmaceuticals America Inc. TRINTELLIX US Prescribing Information. 2026.Needs sourceNo link
2Boyer EW, Shannon M. The serotonin syndrome. N Engl J Med. 2005.Needs sourceNo link

Check your full routine

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Open the interaction checker → Browse the research index