Drug class·SSRIs·Reviewed June 9, 2026
SSRIs and supplements: the serotonin math matters.
The recurring risk with SSRIs is additive serotonin activity: St John's wort, 5-HTP, and tryptophan all push the same pathway, and the combination can climb toward serotonin syndrome. There are also quieter interactions worth knowing. Every documented pairing for each SSRI is listed below.
SSRIs at a glance.
A quick, data-grounded summary. The per-drug tables are below.
Across the 7 SSRIs in the NutriStack database (Sertraline, Fluoxetine, Citalopram, Escitalopram, and Paroxetine and 2 more), 17 substances have a documented interaction, 5 of them flagged to avoid or as a serious conflict. Long-term use of some medications in this class is also associated with lower Sodium and Folate; the depletion table shows exactly which drugs. Interactions are documented per drug, and members of a class do not all behave the same, so check your exact medication below. None of this replaces your prescriber's advice.
The SSRIs we track.
Open any medication for its own full interaction and depletion guide.
Substances that interact with SSRIs.
Merged across the class, highest severity first. The 'Documented for' column shows which members carry the interaction record; an absent drug means no documented record, not proven safety.
| Substance | Interaction | Documented for | What happens |
|---|---|---|---|
| 5-HTP | Contraindicated | All 7 SSRIs | Sertraline: 5-HTP is a direct precursor to serotonin that bypasses the rate-limiting step in serotonin synthesis. When combined with sertraline's... |
| L-Tryptophan | Contraindicated | All 7 SSRIs | Citalopram: L-Tryptophan is the upstream precursor to serotonin. Combined with citalopram's serotonin reuptake blockade, supplemental tryptophan can... |
| St. John's Wort | Contraindicated | All 7 SSRIs | Sertraline: Combining sertraline (an SSRI) with St. John's Wort creates a serious risk of serotonin syndrome, a potentially life-threatening... |
| MDMA | Contraindicated | Sertraline, Fluoxetine, Citalopram +2 more | Sertraline: MDMA causes massive serotonin release by reversing the serotonin transporter (SERT), and sertraline blocks SERT - the same protein MDMA... |
| Tramadol | Contraindicated | Sertraline, Fluoxetine | Sertraline: Concurrent use of SSRIs and tramadol significantly increases the risk of serotonin syndrome, a potentially life-threatening condition... |
| Ginkgo Biloba | Caution | All 7 SSRIs | Sertraline: Sertraline depletes platelet serotonin and impairs aggregation, raising bleeding risk. Ginkgo biloba contains ginkgolides that inhibit... |
| SAMe | Caution | Sertraline, Fluoxetine, Citalopram +3 more | Sertraline: SAMe (S-adenosylmethionine) has demonstrated antidepressant properties and increases serotonergic, noradrenergic, and dopaminergic... |
| Rhodiola Rosea | Caution | Sertraline, Fluoxetine, Citalopram +2 more | Sertraline: Sertraline is serotonergic. Rhodiola has preclinical monoamine and MAO-related findings, but direct human evidence for serotonin syndrome... |
| Fish Oil | Caution | Sertraline, Fluoxetine, Escitalopram +1 more | Sertraline: Sertraline depletes platelet serotonin stores and impairs platelet aggregation, raising bleeding risk by roughly 40-55% across... |
| Melatonin | Caution | Citalopram, Fluvoxamine | Citalopram: Severe sedation has been reported after melatonin was added to a regimen that included citalopram, with the authors judging a... |
| Psilocybin | Caution | Sertraline, Fluoxetine | Sertraline: Sertraline blocks the serotonin transporter and occupies postsynaptic 5-HT2A receptors over time, blunting psilocybin's intended... |
| Amiodarone | Caution | Escitalopram | Both amiodarone and escitalopram can prolong the QT interval. Combined use increases the risk of dangerous cardiac arrhythmias,... |
| Amitriptyline | Caution | Sertraline | Combining an SSRI with a tricyclic antidepressant increases the risk of serotonin syndrome and may elevate TCA blood levels due to CYP2D6... |
| Garlic Extract | Caution | Sertraline | Sertraline depletes platelet serotonin and impairs aggregation; concentrated garlic extracts (allicin, ajoene) inhibit platelet... |
| Green Tea Extract | Caution | Fluvoxamine | Fluvoxamine is a potent CYP1A2 inhibitor, and the caffeine in green tea extracts is metabolized almost entirely by CYP1A2. In healthy... |
| Lithium | Caution | Sertraline | While SSRIs and lithium are commonly used together in treatment-resistant depression and bipolar disorder, the combination carries a... |
| Magnesium Citrate | Synergy | Citalopram | Citalopram produces dose-dependent QT interval prolongation and carries a black-box warning at doses above 40 mg/day (or 20 mg in older... |
What SSRIs can deplete.
Nutrients associated with long-term use somewhere in this class, worst documented severity first. Discuss any replacement with your prescriber.
| Nutrient | Severity | Documented for | Replace with | Monitor |
|---|---|---|---|---|
| Sodium | Significant | Sertraline, Fluoxetine, Citalopram +3 more | – | Serum sodium |
| Folate | Mild | Sertraline, Fluoxetine, Citalopram +3 more | Methylfolate | Serum folate or RBC folate |
Common SSRIs questions.
Quick answers drawn from the tables above.
What supplements should I avoid with SSRIs?
Across the class, 5 substance pairings are flagged to avoid or as a serious conflict, including 5-HTP, L-Tryptophan, St. John's Wort, MDMA, and Tramadol. The exact risk depends on which medication in the class you take, so check your specific drug's page and confirm with your prescriber.
Do all SSRIs interact with supplements the same way?
No. Interactions are documented per drug, and the 7 SSRIs in the database differ in how they are absorbed and cleared. The class table above shows which members carry each record; a drug without a record is undocumented, not proven safe.
Do SSRIs deplete any nutrients?
Some medications in this class are documented to lower Sodium and Folate with long-term use; the depletion table on this page shows which specific drugs carry each record. Useful biomarkers to monitor include Serum sodium and Serum folate or RBC folate. Ask your prescriber before adding a replacement supplement.
Is it safe to take 5-HTP with SSRIs?
NutriStack classifies the 5-HTP and Sertraline pairing as contraindicated: 5-HTP is a direct precursor to serotonin that bypasses the rate-limiting step in serotonin synthesis. When combined with sertraline's serotonin reuptake inhibition,... The interaction is documented for 7 of the 7 SSRIs, and severity differs by drug. Always confirm with your prescriber.
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