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United States· US:43857-0232_0bf65e6f-1631-44ce-94c9-29c249826aea

Tryptophan

A tryptophan product containing l-tryptophan, registered in United States by BioActive Nutritional, Inc.. The same ATC class is registered in 5 of our 19 countries.

ATC N06AX02US label

Checked against FDA National Drug Code directory (United States) on

Informational only — not a medical device.

SOURCE REGISTER · USFDA National Drug Code directory (Unite…normalisedTryptophanATCN06AX02REGISTER NO.US:43857-0232_0bf65e6…PACKS LISTED1CHECKEDJune 3, 2026
Compare price across countriesPer daily dose · free accountAsk the assistant about l-tryptophanAnswers with sources · free accountCheck interactionsSeverity free · mechanism on Growth

Where it is registered

Tryptophan is registered in 5 of 19 countries.

Countries holding a registration under ATC N06AX02 (tryptophan), each read from that country’s own register.

  • This record: United States, from FDA National Drug Code directory (United States)
  • 2 of them publish a price we can compare per daily dose
Search tryptophan products by name

Tryptophan · ATC N06AX02

5 / 19 countries

  • Canada
  • Germany
  • Norwayprice
  • United Kingdom
  • United Statesprice
Blue: a registration under this ATC code. The ringed marker is this record’s country. Markets marked price publish a price we can compare per daily dose.

The record

At a glance

FDA National Drug Code directory (United States)
Active substance
L-Tryptophan
Manufacturer
BioActive Nutritional, Inc.
Country
United States (US)
ATC code
N06AX02
ATC class
Tryptophan
Defined daily dose
1 g, O
Reimbursed
Not published by this register
Source register
FDA National Drug Code directory (United States)
Last checked
June 3, 2026

Packs & prices · 1

  • ndc11
    4385702321
    30 mL in 1 BOTTLE, DROPPER (43857-0232-1)

Regulatory notes

UNII (FDA substance ID)
8DUH1N11BX
TRYPTOPHAN
RxCUI 10898
DailyMed SPL labels
1 version tracked

Interactions

21 interactions on record for tryptophan.

Graded by severity as the source publishes them — 12 severe. Severity grades are free for everyone; mechanism and management come with Growth.

  • Severity for every pair — free, no plan needed
  • The source, licence and sync date on every record
  • Mechanism and what to do for each pair — Growth plan
Check tryptophan against other medicinesHow interaction checks work

Tryptophan · interactions on record

21 records

  • 12 severe
  • 9 moderate

Most severe, free to view

  • OndansetronA04AA01severe
  • GranisetronA04AA02severe
  • DolasetronA04AA04severe
  • PalonosetronA04AA05severe
  • Interaction severity from DDInter 2.0 (Xiong G. et al., Nucleic Acids Res.), licensed CC BY-NC 4.0 — free for non-commercial use only; not covered by the Drug Database commercial licence.
Mechanism and what to do, in the interaction check
Source: DDInter 2.0 · synced 29 Sept 2026. Grades as the source publishes them.

Same medicine, other countries

Tryptophan in 5 other countries

What each register calls a product with the same active substance — salts and hydrates count as the same.

All tryptophan products

Authorised across Europe · EMA

The same active substance is authorised in 2 EEA countries. Names it is sold under:

  • Germany · Ardeydorm, Ardeytropin
  • United Kingdom (Northern Ireland) · Optimax

Source: European Medicines Agency, Article 57 product data.

Sourced from a public register and reproduced with attribution. Drug Database is not affiliated with, endorsed by, or a partner of FDA National Drug Code directory (United States). This is an informational data service and not a medical device — verify against the official source of record before any clinical decision.

For developers

The same record over the API, and the raw payload
GET /v1/drugs/ddb64312-6af6-47b2-8992-b22ab2a0fb32
GET /v1/drugs/ddb64312-6af6-47b2-8992-b22ab2a0fb32?format=fhir

Every response carries last_synced_at, so freshness is a field rather than a promise. Below is exactly what the ingestion wrote, before any presentation — the same JSON the API returns under payload.

{
  "unii": {
    "unii": "8DUH1N11BX",
    "rxcui": "10898",
    "inchikey": "QIVBCDIJIAJPQS-VIFPVBQESA-N",
    "display_name": "TRYPTOPHAN",
    "substance_type": "chemical",
    "ingredient_type": "INGREDIENT SUBSTANCE"
  },
  "route": "ORAL",
  "spl_meta": {
    "70685fd1-9336-44d3-b270-3b3afd7635ca": {
      "match": "brand_token",
      "title": "TRYPTOPHAN LIQUID [DESERET BIOLOGICALS, INC.]",
      "spl_version": "4",
      "published_date": "2024-09-25"
    }
  },
  "productid": "43857-0232_0bf65e6f-1631-44ce-94c9-29c249826aea",
  "productndc": "43857-0232",
  "dosage_form": "LIQUID",
  "dea_schedule": null,
  "product_type": "HUMAN OTC DRUG",
  "substance_name": "TRYPTOPHAN",
  "proprietary_name": "Tryptophan",
  "active_ingred_unit": "[hp_X]/mL",
  "application_number": null,
  "marketing_category": "UNAPPROVED HOMEOPATHIC",
  "nonproprietary_name": "L-Tryptophan",
  "start_marketing_date": "20130925",
  "active_numerator_strength": "6"
}
API referenceMCP serverPlans

See everything about tryptophan.

This page is the registration. A free account adds the label text as the regulator wrote it, what it costs per daily dose across the markets that publish a price, a feed of what changes in the registers, and an assistant that answers with its sources. Interaction severity is free; mechanism and management are on the Growth plan. No card, nothing to install.

Try it freeOpen in the console