The short answer
Review L-tryptophan supplements before using them with mirtazapine. The medicine label specifically names tryptophan in its serotonin-syndrome warning and gives no protective supplement interval.
What this answer covers
Concentrated oral L-tryptophan, not normal protein foods or a different precursor.
- Supplement or preparation
- L-Tryptophan
- Medication ingredient
- mirtazapine
The exact label names tryptophan
Mirtazapine information includes tryptophan among serotonergic products that increase concern during co-use.
Timing is not established protection
The warning does not provide a time gap that makes the supplement safe. Discuss the product before adding it or changing its amount.
Keep normal nutrition distinct
This concern is about adding a concentrated precursor supplement. The prescribing information does not require eliminating ordinary protein foods.
Recognize concerning symptoms
Seek urgent medical care for a combination of agitation or confusion, fever or heavy sweating, tremor, muscle rigidity or repeated twitching. These can be signs of serotonin syndrome; a single nonspecific symptom does not establish the diagnosis.
Evidence and practical considerations
Side effects & toxicity
Conditional supervision/avoidance of unsupervised precursor addition is supported by the exact label.
- Exact scope
- Concentrated oral L-tryptophan, not normal protein foods or a different precursor. with Exact oral mirtazapine tablets and orally disintegrating tablets. Exact oral mirtazapine in Remeron and RemeronSolTab; manufacturer label covers both. No equivalence to unrelated mirtazapine salts or other antidepressants inferred.
- Medication form and route
- oral
- Timing or duration
- Source-specific single-dose, repeated-dose and observational exposures distinguished.
What remains uncertain
- No exact-pair safe dose, event rate or protective spacing established.
Factors that may matter: preparation and plant part; clinical indication; dose; other medicines; baseline alertness.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed oral mirtazapine.
Exact label names tryptophan and St John’s wort in serotonin warnings; CYP3A induction/inhibition may affect levels. Drowsiness and cognitive/motor impairment occur.
How this applies: Exact oral mirtazapine in Remeron and RemeronSolTab; manufacturer label covers both. No equivalence to unrelated mirtazapine salts or other antidepressants inferred.
No universal supplement interval, event rate or preparation equivalence established. Original label distinguishes warnings from measured pair-specific results.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Current exact available claims adjudicated using original captures and explicit identity and comparator limits. | |
| Research summary published |
Article revision: 0ad709134c3543b4
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.