NutriStack
5-HTP and Tramadol, contraindicated.
Tramadol has significant serotonergic activity in addition to its opioid effects, inhibiting serotonin reuptake. Combining it with 5-HTP, a direct serotonin precursor, significantly increases the risk of serotonin syndrome, which can be life-threatening.
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At a glance
- 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. Tramadol has significant serotonergic activity in addition to its opioid effects, inhibiting serotonin reuptake. Combining it with 5-HTP, a direct serotonin precursor, significantly increases the risk of serotonin syndrome, which can be life-threatening.
Mechanism. Tramadol and its M1 metabolite inhibit serotonin and norepinephrine reuptake in addition to activating mu-opioid receptors. 5-HTP increases serotonin synthesis. The combined serotonin reuptake inhibition and increased production can trigger serotonin syndrome.
Recommendation. Do not combine 5-HTP with tramadol. Tramadol's serotonergic properties are often underrecognized, and this combination poses a serious risk of serotonin syndrome. Inform your prescriber if you use 5-HTP.
Sources (3)
- Beakley BD et al. Tramadol, pharmacology, side effects, and serotonin syndrome: a review. Pain Physician. 2015;18(4):395-400. PMID 26218943
- 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 Tramadol 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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