NutriStack
5-HTP and Escitalopram, contraindicated.
5-HTP increases serotonin synthesis while escitalopram potently blocks serotonin reuptake. This combination creates significant risk of serotonin syndrome through complementary mechanisms that both increase synaptic serotonin availability.
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At a glance
- Substances
- 5-HTP and Escitalopram
- Pair type
- Contraindicated
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- −25 to your Stack Score (per scored contraindication row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Contraindicated · Moderate evidence
Contraindicated
What is happening. 5-HTP increases serotonin synthesis while escitalopram potently blocks serotonin reuptake. This combination creates significant risk of serotonin syndrome through complementary mechanisms that both increase synaptic serotonin availability.
Mechanism. 5-HTP is decarboxylated to serotonin by AADC, increasing serotonin synthesis. Escitalopram is the most selective SERT inhibitor, maximizing synaptic serotonin retention. Combined increased production and decreased clearance can trigger serotonin syndrome.
Recommendation. Do not combine 5-HTP with escitalopram. If you are currently using both, discontinue 5-HTP and inform your prescriber.
Sources (3)
- Birdsall TC. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. Altern Med Rev. 1998;3(4):271-280. PMID 9727088
- Truyens M, Lobatón T, Ferrante M et al.. Effect of 5-Hydroxytryptophan on Fatigue in Quiescent Inflammatory Bowel Disease: A Randomized Controlled Trial. Gastroenterology. 2022. PMID 35940251
- Sutanto CN, Xia X, Heng CW et al.. The impact of 5-hydroxytryptophan supplementation on sleep quality and gut microbiota composition in older adults: A randomized controlled trial. Clinical Nutrition. 2024. PMID 38309227
Stack Score
How this pair moves the number.
Effect on the composite score
If both 5-HTP and Escitalopram 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 documented at /methodology/stack-score.
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