The short answer
Review L-5-HTP before adding it to clorazepate. L-5-HTP can cause drowsiness, but the amount of added impairment from this exact combination is unknown.
What this answer covers
Oral L-5-hydroxytryptophan; not L-tryptophan, another isomer or whole Griffonia seed.
- Supplement or preparation
- L-5-HTP
- Medication ingredient
- clorazepate
What the supplement guidance says
Health Canada warns that L-5-HTP may cause drowsiness and advises caution with driving or machinery. Clorazepate can also impair alertness, so adding it deserves review.
Keep different warnings separate
The monograph has separate cautions about serotonergic products and antidepressants. Those do not establish that clorazepate is an antidepressant or that this pair causes serotonin syndrome.
Check the exact ingredient
Bring the L-5-HTP amount and full ingredient list to the pharmacist. This ingredient is different from L-tryptophan, and no protective dosing gap has been established.
Watch for impaired alertness
Clorazepate can affect alertness and coordination. Avoid driving if affected. Seek urgent help for severe difficulty waking or breathing, and tell the prescriber about alcohol, opioids and all other sedating products.
Evidence and practical considerations
Side effects & toxicity
A conditional alertness precaution follows exact L-5-HTP guidance and clorazepate CNS effects, without claiming a demonstrated co-use reaction.
- Exact scope
- Oral L-5-hydroxytryptophan; not L-tryptophan, another isomer or whole Griffonia seed. with Exact oral clorazepate dipotassium tablets. Rapid oral decarboxylation forms nordiazepam, with essentially no circulating parent; nordiazepam half-life about 40-50 hours. Human-serum-albumin binding of the swallowed parent is not an in vivo metabolite study. RxNorm IN 2353 relates to PIN 2607 dipotassium, matching the label.
- Medication form and route
- oral
- Timing or duration
- Source-specific single-dose, repeated-dose and observational exposures distinguished.
What remains uncertain
- No exact human co-use study identified. Clorazepate is not assumed to be serotonergic from L-5-HTP’s unrelated serotonin warnings.
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: Patients prescribed oral clorazepate.
Can impair alertness and coordination; other CNS depressants can increase impairment. Opioid combinations have a specific respiratory-depression warning. Dependence and withdrawal require supervised changes. Rapid oral decarboxylation forms nordiazepam, with essentially no circulating parent; nordiazepam half-life about 40-50 hours. Human-serum-albumin binding of the swallowed parent is not an in vivo metabolite study. RxNorm IN 2353 relates to PIN 2607 dipotassium, matching the label.
How this applies: Exact IN and labeled oral formulation; route, salt and metabolite distinctions retained.
No quantified risk for every herb or universal protective spacing interval. Opioid-specific evidence does not prove equal botanical respiratory risk.
Source 2: official product monograph
webprod.hc-sc.gc.ca · Source check Sep 10, 2026
Population: Users of oral L-5-HTP products.
Warns that drowsiness can occur and driving or machinery use requires caution.
How this applies: Supports exact-product alertness review only.
Does not test clorazepate co-use. Its separate antidepressant/serotonergic warnings do not establish that clorazepate is serotonergic.
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: a6349de164a6b2fe
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.