The short answer
Do not self-start L-5-HTP with trazodone. Official L-5-HTP guidance advises against antidepressant co-use; a short mixed-formula sleep trial does not establish standalone supplement safety.
What this answer covers
Concentrated oral L-5-hydroxytryptophan; distinct from the proprietary Sentra PM formula and unspecified precursor amounts.
- Supplement or preparation
- L-5-HTP
- Medication ingredient
- trazodone
The supplement warning is relevant
Health Canada advises not to use L-5-HTP with antidepressants, which includes trazodone. Review the product before adding it.
A medical-food trial reported no adverse events
A fourteen-day study combined trazodone with Sentra PM in twenty-two participants. No adverse events were reported, providing a limited tolerability observation.
The tested formula is not your single ingredient
The proprietary mixture used multiple components and did not provide adequate precursor dose and isomer detail. Its short follow-up and manufacturer ties further limit conclusions about standalone L-5-HTP.
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 precaution follows explicit supplement guidance, with contrary short-term combination-formula tolerability retained.
- Exact scope
- Concentrated oral L-5-hydroxytryptophan; distinct from the proprietary Sentra PM formula and unspecified precursor amounts. with Exact oral trazodone hydrochloride immediate-release tablets. RxNorm IN 10737/PIN 82112 hydrochloride; current immediate-release tablet scope. Oral solutions and modified-release products are not automatically equivalent.
- Medication form and route
- oral
- Timing or duration
- Source-specific single-dose, repeated-dose and observational exposures distinguished.
What remains uncertain
- Sentra PM precursor component and dose cannot establish exact standalone L-5-HTP exposure or a safe dose; no serotonin event rate measured.
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 trazodone.
Exact label names tryptophan and St John’s wort in serotonin warnings; strong CYP3A4 modifiers may change exposure. Drowsiness, orthostatic effects and QT warnings are distinct.
How this applies: RxNorm IN 10737/PIN 82112 hydrochloride; current immediate-release tablet scope. Oral solutions and modified-release products are not automatically equivalent.
No universal supplement interval, event rate or preparation equivalence established. Original label distinguishes warnings from measured pair-specific results.
Source 2: official product guidance
webprod.hc-sc.gc.ca · Source check Sep 10, 2026
Population: Adults considering oral L-5-HTP.
Advises not to use with antidepressants; gives serotonergic product precautions and drowsiness caution.
How this applies: The requested medicine is an antidepressant; this is a product-label precaution, not exact-pair clinical proof.
Does not quantify risk with each specific antidepressant or establish a safe supplement dose.
Source 3: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 111 sleep-disorder participants in four randomized groups; 22 assigned the combination.
Sleep outcomes improved in the combination arm; no adverse events or complications were reported in any group.
How this applies: Only the named drug, preparation, route and measured endpoints apply.
Mixed proprietary medical food described as using a hydroxytryptophan precursor, without adequate component-dose/isomer detail for standalone L-5-HTP or L-tryptophan. Short trial, small combination group, uneven randomization and manufacturer ties.
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: 58a5cc25567edd99
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.