# ClinicalTrials.gov

License: unstated (NOASSERTION); Mdexa hosting: pending. the official terms say the data are free to use but not whether commercial use or redistribution is allowed: unstated, terms present (Article 24)

- Commercial use: Unclear · Derivatives: Conditional · Redistribution: Unclear · File on Mdexa: No
- License status: Unstated (NOASSERTION)
- Mdexa hosting: Pending — License unstated, judged by public rules and checked by a second-pass model. The license question stays open.
- Last verified: 2026-11-13
- Card: https://mdexa.com/datasets/clinicaltrials-gov/

## Key facts

- Domain: Clinical medicine, Pharmacy and drugs
- Content type: Registries
- Size: — — {"totalStudies":611552,"averageSizeBytes":17327
- Language: English
- Modality: Text
- Publisher: U.S. National Library of Medicine
- Year: —

## Commercial use of ClinicalTrials.gov

- Commercial use: Unclear (Unstated).
- License status: Unstated.
- Conditions: Attribution, State modifications, Keep current
Verdicts record what sources state and are not legal advice.

## ClinicalTrials.gov license evidence

the official terms say the data are free to use but not whether commercial use or redistribution is allowed: unstated, terms present (Article 24)

- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "The following Terms and Conditions apply for use of ClinicalTrials.gov data. Downloading ClinicalTrials.gov data indicates your acceptance of the following Terms and Conditions." — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "ClinicalTrials.gov data are available to all requesters, both within and outside the United States, at no charge." — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "Attribute the source of the data as ClinicalTrials.gov" — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "You shall not assert any proprietary rights to any portion of the database, or represent the database or any part thereof to anyone as other than a United States Government database." — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "You shall not use any email addresses extracted from our database for marketing or other promotional purposes." — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "The ClinicalTrials.gov data carry an international copyright outside the United States and its Territories or Possessions. Some ClinicalTrials.gov data may be subject to the copyright of third parties; you should consult these entities for any additional terms of use." — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "Update the data such that they are current at all times" — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "Clearly display the date the data were processed by ClinicalTrials.gov" — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "State any modifications made to the content of the data, along with a complete description of the modifications" — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)
- **Terms of use page**: Statement found in snapshot s09 (terms-page) — "These terms and conditions are in effect as long as the user retains any of the data obtained from ClinicalTrials.gov." — https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13; Page opened)

## Source and lineage

—

## Known issues with ClinicalTrials.gov

- No warranties are made and no liability is assumed for use of the data.
- Some data may be subject to third-party copyright; users must consult those parties for additional terms.
- The database is updated daily and users are advised to check frequently for current information.

## Preflight

Not run (data not ingested).

## Downloading ClinicalTrials.gov and API access

Mdexa does not serve files. Original source:
- https://clinicaltrials.gov/
- https://clinicaltrials.gov/about-site/terms-conditions

### Access recipe

- Latest: 2026-11-12T10:00:05 (2026-11-12T10:00:05)
- API Version: `https://clinicaltrials.gov/api/v2/version` · example `GET https://clinicaltrials.gov/api/v2/version`
- API Stats - size: `https://clinicaltrials.gov/api/v2/stats/size` · example `GET https://clinicaltrials.gov/api/v2/stats/size`

## Citing ClinicalTrials.gov

No recommended citation text.

## Machine-readable

- JSON: https://mdexa.com/datasets/clinicaltrials-gov.json
- 2026-11-14 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-14 Practical fields (scope, identifiers, access methods, versions, known defects) were added by the automated pipeline from stored page snapshots; every statement carries a verbatim quote.
- 2026-11-14 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-14 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-14 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-14 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-14 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-13 Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.
- 2026-11-13 Listed on 2026-11-13. Judged by public rules and checked a second time before listing.

## Practical information

### Content scope

- The API size statistics report 611552 total studies.
  > "totalStudies":611552
  https://clinicaltrials.gov/api/v2/stats/size (2026-11-13)
- The text states that ClinicalTrials.gov contains summary information about clinical studies conducted throughout the United States and in many countries worldwide.
  > ClinicalTrials.gov contains summary information about clinical studies being conducted throughout the United States and in many countries throughout the world.
  https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13)

### Identifiers

- The statistics list studies under identifiers such as NCT02723955.
  > "id":"NCT02723955"
  https://clinicaltrials.gov/api/v2/stats/size (2026-11-13)

### Access

- Web API: https://clinicaltrials.gov/api/v2/version
- Web API: https://clinicaltrials.gov/api/v2

### Versions

- There are no numbered data releases; the API's version endpoint reports the dataset posting time (on the check date: dataTimestamp 2026-11-12T10:00:05, API version 2.0.5).
  > "dataTimestamp" : "2026-11-12T10:00:05"
  https://clinicaltrials.gov/api/v2/version (2026-11-13)
- The text states that ClinicalTrials.gov is updated daily.
  > ClinicalTrials.gov is updated daily.
  https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13)
- The classic ClinicalTrials.gov website and its API were retired on 25 June 2024.
  > Effective today, the classic ClinicalTrials.gov website and its application programming interface (API) are retired and no longer available.
  https://nlm.nih.gov/pubs/techbull/mj24/mj24_Modern_Clinical_Trials_Website.html (2026-11-13)

### Known defects and misuse

- Tse et al.: many records are not updated in time; as of February 2018 about 9.4% of records had 'unknown' recruitment status, meaning not updated or verified for two years.
  > Despite the capability to make changes to a record, many records are not updated in a timely way.
  https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/ (2026-11-13)
- Tse et al.: complete, accurate registration and results reporting depend on consistent reporting by sponsors and investigators.
  > Achieving these goals depends on consistent and systematic reporting by sponsors and investigators.
  https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/ (2026-11-13)

### Suited for

- The text states that the National Institutes of Health developed ClinicalTrials.gov to provide patients, family members, and members of the public with current information about clinical research studies.
  > The U.S. National Institutes of Health, Department of Health and Human Services, through its National Library of Medicine, has developed ClinicalTrials.gov to provide patients, family members, and members of the public current information about clinical research studies.
  https://clinicaltrials.gov/about-site/terms-conditions (2026-11-13)

### No sourced statement yet

Unsuited tasks, Commercial licensing

## Continue in this database

This record is one of 109 processed and verified records (datasets, data resources and open models). To find others, call `https://mcp.mdexa.com/v1/datasets?q=<words>` or connect the MCP server at `https://mcp.mdexa.com/mcp`; no key is needed for 20 calls per minute. Rows are under 1 KB; an empty result means "not listed". For a list of items, one batch check (free account) returns a report. Guide: /agents.md. Similar records: 医学考试题库 JSON 数据集 (https://mdexa.com/datasets/medical-exam-question-bank-json/); QASystemOnMedicalKG（医疗知识图谱） (https://mdexa.com/datasets/qasystem-medical-kg/); DrugCentral (https://mdexa.com/datasets/drugcentral/).