NutriStack
5-HTP and Sumatriptan, a caution.
5-HTP is a direct serotonin precursor, and sumatriptan is a serotonin receptor agonist used for migraine attacks. Direct case evidence for this exact pair is limited, but combining a serotonin precursor with a triptan can add serotonergic pressure and may increase the risk of serotonin toxicity. Warning signs include agitation, tremor, sweating, diarrhea, clonus, fever, or confusion.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- 5-HTP and Sumatriptan
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. 5-HTP is a direct serotonin precursor, and sumatriptan is a serotonin receptor agonist used for migraine attacks. Direct case evidence for this exact pair is limited, but combining a serotonin precursor with a triptan can add serotonergic pressure and may increase the risk of serotonin toxicity. Warning signs include agitation, tremor, sweating, diarrhea, clonus, fever, or confusion.
Mechanism. 5-HTP is decarboxylated to serotonin and can increase serotonin synthesis. Sumatriptan activates 5-HT1B/1D receptors; combined serotonergic mechanisms can contribute to serotonin receptor overstimulation in susceptible patients.
Recommendation. Avoid 5-HTP supplements while using sumatriptan unless your prescriber specifically approves the combination. If both were taken and you develop tremor, fever, marked restlessness, muscle jerks, or confusion, seek urgent care. Food sources of tryptophan are not the issue; concentrated 5-HTP supplements are.
Sources (3)
- Birdsall TC. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. Altern Med Rev. 1998;3(4):271-280. PMID 9727088
- Boyer EW, Shannon M. The serotonin syndrome. N Engl J Med. 2005;352(11):1112-1120. PMID 15784664
- Evans RW, Tepper SJ, Shapiro RE, Sun-Edelstein C, Tietjen GE. The FDA alert on serotonin syndrome with use of triptans combined with selective serotonin reuptake inhibitors or selective serotonin-norepinephrine reuptake inhibitors: American Headache Society position paper. Headache. 2010;50(6):1089-1099. PMID 20618823
Stack Score
How this pair moves the number.
Effect on the composite score
If both 5-HTP and Sumatriptan are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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