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Medicines and supplements

L-tryptophan and escitalopram: why the label advises against it

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

Ask your pharmacist or doctor before combining. The escitalopram label states that using it with tryptophan is not recommended, because together they raise the risk of serotonin syndrome. MedlinePlus also lists tryptophan, alongside St. John's wort, as a product that may interact with escitalopram.1,2

Key facts

  • The label's summary of drug interactions says use with tryptophan is not recommended.1
  • Its full warning names tryptophan as a serotonergic drug and tells prescribers to watch for serotonin syndrome.1
  • The patient medication guide asks people to tell their provider if they take tryptophan.1
  • NIH's center for complementary health counts L-tryptophan supplements among its serious safety concerns.3

Avoid the combination unless your doctor advises it

The escitalopram label says using it with tryptophan is not recommended, because the combination raises the risk of serotonin syndrome. MedlinePlus also lists tryptophan among the nonprescription products that may interact with escitalopram.1,2,3

On the medicine's label

What the escitalopram label says

The plainest statement is in the label's highlights, the summary at the top of the prescribing information: using escitalopram with SSRIs, SNRIs or tryptophan is not recommended. The full warning explains why. Escitalopram can bring on serotonin syndrome by itself, and the risk climbs with other serotonergic drugs, a list that includes tryptophan as well as triptans, tricyclic antidepressants, tramadol, lithium, buspirone and St. John's wort.1

Where a prescriber decides a combination of serotonergic drugs is warranted anyway, the label asks them to explain the higher risk and to watch for symptoms, particularly when escitalopram is started or the dose goes up.1

What NIH sources add

MedlinePlus groups tryptophan with St. John's wort, aspirin, ibuprofen and naproxen as nonprescription or herbal products that may interact with escitalopram. It asks you to tell your doctor and pharmacist about them before you begin, and to talk with your healthcare provider before starting any of them during treatment.2

Writing about supplements for sleep, NIH's center for complementary health names L-tryptophan as a serious safety concern, because with medicines that affect serotonin it may lead to serotonin toxicity that can be life-threatening.3

Symptoms that need a doctor now

Call a doctor immediately, MedlinePlus says, if someone on escitalopram develops fever, sweating, confusion, a fast or irregular heartbeat, severe muscle stiffness or twitching, agitation, hallucinations, loss of coordination, nausea, vomiting or diarrhea. The label's own list goes further, to delirium, coma and seizures.1,2

If these follow taking tryptophan with escitalopram, treat it as an emergency.

Questions for your pharmacist

  • Given what the label says, should I avoid tryptophan altogether while on escitalopram?
  • Does any sleep or mood product I use list L-tryptophan among its ingredients?
  • Are any of my other medicines serotonergic as well?
  • If I stop escitalopram one day, what should I ask before taking tryptophan?

Questions people ask

Is this the same warning as for sertraline?

Similar, but stated more firmly. Both labels list tryptophan among serotonergic drugs that raise the risk of serotonin syndrome, and the escitalopram label's highlights add that the combination is not recommended.1,4

I took tryptophan and escitalopram together. What should I do?

Tell your doctor or pharmacist. If you have symptoms such as fever, confusion, a racing heartbeat, muscle twitching or agitation, get medical help straight away.2

Does it matter if the tryptophan is part of a blend?

The label names tryptophan, not a form or a product, so a sleep or mood blend that lists L-tryptophan counts. Ask your pharmacist about anything you take.1

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Sources

  1. Escitalopram tablets: prescribing information (Aurobindo Pharma Limited). DailyMed, U.S. National Library of Medicine. Published May 20, 2026. Opened 2026-10-07.
  2. MedlinePlus Drug Information. Escitalopram. U.S. National Library of Medicine. Last revised October 15, 2025. Opened 2026-10-07.
  3. National Center for Complementary and Integrative Health. Sleep Disorders and Complementary Health Approaches. Bethesda (MD): National Institutes of Health. Last updated May 2024. Opened 2026-10-07.
  4. Sertraline hydrochloride tablets: prescribing information (Cipla USA Inc.). DailyMed, U.S. National Library of Medicine. Published June 23, 2026. Opened 2026-10-07.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.