Supplement·Interactions·Reviewed June 9, 2026
5-HTP interactions.
5-HTP has 50 documented interactions in the NutriStack database: 27 to avoid or watch closely, 22 that need timing or caution, and 1 that work synergistically. The full list, with what each pairing does, is below.
In short
5-HTP at a glance.
A quick, data-grounded summary. The full table is below.
5-HTP has 50 documented interactions in the NutriStack database: 27 to avoid or watch closely, 22 that need timing or caution, and 1 that work synergistically. The full list, with what each pairing does, is below.
Interactions
Everything that interacts with 5-htp.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Citalopram | Contraindicated | 5-HTP combined with citalopram creates serotonin syndrome risk. Citalopram also prolongs QTc, and serotonin excess can worsen cardiac effects. details → |
| Clomipramine | Contraindicated | 5-HTP increases serotonin synthesis and can precipitate serotonin syndrome with clomipramine. |
| Desvenlafaxine | Contraindicated | Desvenlafaxine blocks serotonin reuptake, while 5-HTP is converted directly into serotonin. Taking them together can push serotonin signaling into a... details → |
| Duloxetine | Contraindicated | Duloxetine is a serotonin-norepinephrine reuptake inhibitor (SNRI) that potently blocks serotonin reuptake. Adding 5-HTP, a direct serotonin... details → |
| Escitalopram | Contraindicated | 5-HTP increases serotonin synthesis while escitalopram potently blocks serotonin reuptake. This combination creates significant risk of serotonin... details → |
| Fluoxetine | Contraindicated | 5-HTP directly increases serotonin synthesis, while fluoxetine blocks serotonin reuptake. This combination can lead to serotonin syndrome. The risk... details → |
| Fluvoxamine | Contraindicated | 5-HTP is the immediate precursor to serotonin and bypasses the rate-limiting step in serotonin synthesis. Combined with fluvoxamine's blockade of... details → |
| Isocarboxazid | Contraindicated | 5-HTP increases serotonin synthesis while Isocarboxazid reduces monoamine breakdown. Combining them can cause dangerous serotonergic excess and... details → |
| L-Tryptophan | Contraindicated | Both 5-HTP and L-Tryptophan increase serotonin synthesis. Combining them creates additive serotonin excess, risking serotonin syndrome. details → |
| Levomilnacipran | Contraindicated | 5-HTP can raise serotonin synthesis and add to levomilnacipran's serotonergic activity. |
| Linezolid | Contraindicated | 5-HTP can increase serotonergic tone and is unsafe with Linezolid's monoamine oxidase inhibitory activity. |
| MAOIs | Contraindicated | 5-HTP increases serotonin synthesis while MAOIs reduce monoamine breakdown. Combining them can cause dangerous serotonergic excess and serotonin... details → |
| MDMA | Contraindicated | Taking 5-HTP with MDMA sharply increases the risk of serotonin syndrome, a potentially life-threatening state of excess serotonergic activity with... details → |
| Paroxetine | Contraindicated | 5-HTP combined with paroxetine creates dangerous serotonin syndrome risk. Paroxetine is the most potent SERT inhibitor among SSRIs. details → |
| Phenelzine | Contraindicated | 5-HTP increases serotonin synthesis while Phenelzine reduces monoamine breakdown. Combining them can cause dangerous serotonergic excess and... details → |
| Rasagiline | Contraindicated | 5-HTP can increase serotonin synthesis and is unsafe with MAO-inhibiting therapy. |
| Selegiline | Contraindicated | 5-HTP increases serotonin synthesis while Selegiline reduces monoamine breakdown. Combining them can cause dangerous serotonergic excess and... details → |
| Sertraline | Contraindicated | 5-HTP is a direct precursor to serotonin that bypasses the rate-limiting step in serotonin synthesis. When combined with sertraline's serotonin... details → |
| SSRIs/SNRIs/MAOIs | Contraindicated | 5-HTP increases serotonin synthesis and can combine dangerously with serotonergic antidepressants or MAO inhibitors, increasing serotonin syndrome... details → |
| St. John's Wort | Contraindicated | St. John's Wort inhibits serotonin reuptake while 5-HTP floods serotonin synthesis. Combined use risks serotonin syndrome: a potentially fatal... details → |
| Tapentadol | Contraindicated | 5-HTP may increase serotonergic tone and could raise serotonin syndrome risk with tapentadol. |
| Tramadol | Contraindicated | Tramadol has significant serotonergic activity in addition to its opioid effects, inhibiting serotonin reuptake. Combining it with 5-HTP, a direct... details → |
| Tranylcypromine | Contraindicated | 5-HTP increases serotonin synthesis while Tranylcypromine reduces monoamine breakdown. Combining them can cause dangerous serotonergic excess and... details → |
| Trazodone | Contraindicated | Trazodone is a serotonin antagonist and reuptake inhibitor (SARI). Combined with 5-HTP, the increased serotonin production creates serotonin... details → |
| Venlafaxine | Contraindicated | Venlafaxine is an SNRI that blocks serotonin reuptake, particularly at lower doses where its effect is predominantly serotonergic. Adding 5-HTP... details → |
| Vilazodone | Contraindicated | 5-HTP can increase serotonin production and may precipitate serotonin syndrome with vilazodone. |
| Vortioxetine | Contraindicated | 5-HTP is a direct serotonin precursor. Combining it with vortioxetine can produce excessive serotonergic activity and serotonin syndrome. |
| Black Cohosh | Caution | On their own, supplemental 5-HTP can already raise serotonin levels, and Black Cohosh has measurable serotonergic pharmacology plus at least one... |
| Buspirone | Caution | 5-HTP is a direct serotonin precursor, and buspirone acts at serotonin 5-HT1A receptors. Taking them together can add serotonergic pressure and may... |
| Crocin (Saffron Extract) | Caution | 5-HTP increases serotonin synthesis while saffron modulates serotonin reuptake. Used together they may additively raise serotonergic activity. |
| Doxepin | Caution | At antidepressant doses, doxepin has serotonin reuptake effects; 5-HTP can increase serotonin synthesis. |
| DSIP (Delta Sleep-Inducing Peptide) | Caution | 5-HTP can cause sleepiness and serotonergic adverse effects; combining with unapproved DSIP complicates safety monitoring. |
| Epitalon | Caution | 5-HTP can alter sleep and mood, complicating epitalon-related CNS effects. |
| Isoniazid | Caution | Isoniazid has weak monoamine oxidase inhibiting activity; 5-HTP could theoretically increase serotonergic adverse-effect risk, although the evidence... |
| Jujube | Caution | Both may affect sleep and CNS signaling; 5-HTP adds serotonergic considerations. |
| Kava | Caution | Both may affect CNS state and sleepiness; 5-HTP adds serotonergic considerations. |
| L-Tyrosine | Caution | L-Tyrosine (a catecholamine precursor) and 5-HTP (a serotonin precursor) compete for the same blood-brain-barrier transporter, and unbalanced... |
| Levodopa/Carbidopa | Caution | 5-HTP and levodopa may compete for the same amino acid transport systems (large neutral amino acid transporter) across the blood-brain barrier and... |
| Melatonin | Caution | 5-HTP is a serotonin precursor, and serotonin is converted to melatonin. Taking both may lead to excessive serotonergic/melatonergic activity. details → |
| Mirtazapine | Caution | Mirtazapine enhances serotonergic and noradrenergic transmission through alpha-2 antagonism. Adding 5-HTP increases serotonin production, creating... details → |
| Mucuna Pruriens | Caution | Combining dopamine-precursor and serotonin-precursor strategies can produce unpredictable mood, sleep, nausea, or blood pressure effects. |
| Psilocybin | Caution | 5-HTP increases serotonin synthesis and, combined with the serotonergic psychedelic psilocybin, raises the theoretical risk of excessive... |
| Rhodiola Rosea | Caution | Rhodiola has preclinical monoamine effects, while 5-HTP increases serotonin synthesis. Combined use carries a theoretical serotonin-excess risk, but... |
| Rizatriptan | Caution | 5-HTP is a serotonin precursor, and rizatriptan is a 5-HT1B/1D receptor agonist. Direct case evidence for this exact pair is limited, but the... |
| Saffron Extract | Caution | Both may increase serotonergic tone and could raise serotonin-toxicity risk when combined with serotonergic medications. |
| SAMe | Caution | Both SAMe and 5-HTP independently elevate serotonin activity, so combining them stacks two pro-serotonergic mechanisms. Case literature documents... |
| Selank | Caution | 5-HTP affects serotonin and mood while selank is used for anxiety, increasing unpredictability. |
| Sumatriptan | Caution | 5-HTP is a direct serotonin precursor, and sumatriptan is a serotonin receptor agonist used for migraine attacks. Direct case evidence for this... |
| Vitex (Chasteberry) | Caution | Both may affect mood-related symptoms and neurotransmitter pathways. |
| Vitamin B6 | Synergy | Vitamin B6 (as PLP) is a required cofactor for aromatic L-amino acid decarboxylase, which converts 5-HTP to serotonin. |
Go deeper
The full 5-htp profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
FAQ
Common 5-htp questions.
Quick answers drawn from the table above.
What interacts with 5-HTP?
In the NutriStack database, 5-HTP has 50 documented interactions with other supplements and medications. The most notable include Citalopram, Clomipramine, Desvenlafaxine, Duloxetine, and Escitalopram.
What should you not take with 5-HTP?
5-HTP is flagged against 27 substances in the database, including Citalopram, Clomipramine, Desvenlafaxine, Duloxetine, Escitalopram, and Fluoxetine. Review these with a clinician before combining, especially alongside prescription medications.
What works well with 5-HTP?
5-HTP pairs synergistically with Vitamin B6 in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take 5-HTP with Citalopram?
NutriStack classifies the 5-HTP and Citalopram pairing as contraindicated: 5-HTP combined with citalopram creates serotonin syndrome risk. Citalopram also prolongs QTc, and serotonin excess can worsen cardiac effects. Do NOT take 5-HTP with citalopram.
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