Clinical trial registries

HDB-0011

ClinicalTrials.gov

US National Library of Medicine The world's largest registry of clinical studies, spanning interventional trials and observational studies in 200+ countries, with protocols, eligibility criteria and posted results. Fully open with a modern REST API. Trial registry Open access HDB-0086

Pan African Clinical Trials Registry (PACTR)

South African Medical Research Council (SAMRC) PACTR is the first WHO-recognized primary clinical trials registry in Africa, providing a free, open-access platform for registration of planned, ongoing, and completed clinical trials conducted across the continent. Established in 2007 and expanded to all disease conditions in 2009, the registry documents research patterns, funding, ethics, and locations of African-based trials. Trial registry Open access HDB-0147

WHO ICTRP (International Clinical Trials Registry Platform)

World Health Organization ICTRP is a WHO-operated search portal that aggregates clinical trial registration data from 18 primary registries across multiple countries and regions, including trials in all phases and across all therapeutic areas. The platform provides a unified search interface for finding trial information while linking to the original records maintained by contributing registries. Trial registry Open access HDB-0148

EudraCT

European Medicines Agency (EMA) EudraCT is the European Union's database for interventional clinical trials on medicinal products conducted in the EU/EEA from May 2004 through January 2025 under Directive 2001/20/EC. As of January 31, 2025, new EU/EEA trials must transition to the newer Clinical Trials Information System (CTIS), though EudraCT continues to accept results submissions and third-country trial files. Trial registry Open access HDB-0149

EU Clinical Trials Register

European Medicines Agency (EMA) The EU Clinical Trials Register provides public access to information on trials previously registered in EudraCT, including trial protocols and results data. It serves as the historical and transitional repository for EU/EEA trial information while ongoing trials are registered through the newer Clinical Trials Information System. Trial registry Open access HDB-0150

ISRCTN Registry

BioMed Central / Springer Nature ISRCTN is the UK's only WHO-recognised primary clinical study registry, accepting registration of interventional and non-interventional studies at any stage (proposed, ongoing, or completed). All records are freely searchable and openly accessible, supporting UK transparency requirements effective April 2026 that mandate prospective registration and results publication within 12 months. Trial registry Open access HDB-0151

CTRI (Clinical Trials Registry - India)

Indian Council of Medical Research, National Institute for Research in Digital Health CTRI is a free public registry for registration of all clinical trials conducted in India, mandatory since 2009 and accessible through both the CTRI website and WHO's ICTRP. The registry contains over 115,000 trials including drug trials, surgical procedures, device studies, behavioral interventions, and AYUSH research, all prospectively registered before participant enrollment. Trial registry Open access HDB-0152

ChiCTR (Chinese Clinical Trial Registry)

Chinese Clinical Trial Registry Center ChiCTR is a WHO-recognised primary registry for clinical trials conducted in China, offering searchable access organized by geographic location, disease codes, funding source, recruitment status, and ethical committee approval. The platform includes a user account system for researchers to register and manage trials, with free registration and comprehensive methodology resources available. Trial registry Free registration HDB-0153

ReBEC (Brazilian Clinical Trials Registry)

Ministry of Health / Pan American Health Organization / Oswaldo Cruz Foundation ReBEC is a free-access virtual platform for registration of experimental and non-experimental studies conducted in Brazil, hosted by a collaborative effort of government and international health organizations. The registry contains over 18,700 trials including 5,162 actively recruiting studies, with multilingual support (Portuguese and English) and dedicated user assistance available 24/7. Trial registry Free registration HDB-0295

CTIS (Clinical Trials Information System)

European Medicines Agency (EMA) CTIS is the European Medicines Agency's system through which sponsors apply to run a clinical trial and manage an ongoing trial across up to 30 EU and EEA countries, launched on 31 January 2022. It replaced EudraCT for new trials and publishes information on individual trials in the EU and EEA through a public search interface. Trial registry Open access HDB-0296

ANZCTR (Australian New Zealand Clinical Trials Registry)

Australian New Zealand Clinical Trials Registry ANZCTR is the clinical trials registry serving Australia and New Zealand, listed by WHO as a primary registry in the ICTRP network. Records registered here are aggregated into the WHO ICTRP search portal, which draws its data from the primary registries. Trial registry Open access HDB-0297

CRiS (Clinical Research Information Service)

Clinical Research Information Service (CRiS), Republic of Korea CRiS is the clinical trials registry for the Republic of Korea, listed by WHO as a primary registry in the ICTRP network. Trials registered here are aggregated into the WHO ICTRP search portal alongside the other primary registries. Trial registry Open access HDB-0298

DRKS (German Clinical Trials Register)

Bundesinstitut für Arzneimittel und Medizinprodukte (BfArM) DRKS is the WHO-recognised primary register for Germany, operated by the Federal Institute for Drugs and Medical Devices (BfArM), and registers health-related studies conducted in Germany on human subjects. Its search is publicly accessible and researchers register their studies through a separate registration portal. Trial registry Open access HDB-0299

IRCT (Iranian Registry of Clinical Trials)

Iran University of Medical Sciences; Ministry of Health and Medical Education (MOHME) IRCT registers studies that prospectively assign human participants to health-related interventions in order to evaluate effects on health outcomes, and accepts registrations from researchers worldwide. It was established with support from Iran's Ministry of Health and Medical Education and is hosted by Iran University of Medical Sciences, with search open to the public. Trial registry Open access HDB-0300

ITMCTR (International Traditional Medicine Clinical Trial Registry)

International Traditional Medicine Clinical Trial Registry ITMCTR is a primary registration body of the WHO International Clinical Trials Registry Platform dedicated to clinical trials in traditional medicine. It prioritises prospective registration, asking researchers to register before conducting a study, and offers basic and advanced public search of registered trials. Trial registry Open access HDB-0301

jRCT (Japan Registry of Clinical Trials)

Ministry of Health, Labour and Welfare, Japan jRCT is Japan's clinical research registry, operated by the Ministry of Health, Labour and Welfare, covering clinical trials and research together with regenerative medicine procedures. It is the official submission and public disclosure system for the implementation plans and notifications required under Japan's Clinical Research Law and the Act on the Safety of Regenerative Medicine. Trial registry Open access HDB-0302

LBCTR (Lebanon Clinical Trials Registry)

Ministry of Public Health, Lebanon LBCTR is an online registry of clinical trials being undertaken in Lebanon, owned and funded by the Lebanese Ministry of Public Health. Its mandatory data items comply with the WHO minimum registration dataset, and WHO lists it among the ICTRP primary registries. Trial registry Open access HDB-0303

TCTR (Thai Clinical Trials Registry)

Foundation for Human Research Promotion in Thailand, under the Central Research Ethics Committee of Thailand TCTR accepts all kinds of clinical research including clinical trials and observational studies, with registrants required to supply the WHO ICTRP dataset items. It has been a WHO primary registry since 7 August 2013 and moved from the Medical Research Foundation to the Foundation for Human Research Promotion in Thailand on 1 January 2024. Trial registry Open access HDB-0304

REPEC (Registro Peruano de Ensayos Clínicos)

Instituto Nacional de Salud (INS), Peru REPEC is Peru's national clinical trials registry, hosted by the Instituto Nacional de Salud, and is listed by WHO as a primary registry in the ICTRP network. Trials registered here are aggregated into the WHO ICTRP search portal alongside the other primary registries. Trial registry Open access HDB-0305

SLCTR (Sri Lanka Clinical Trials Registry)

Sri Lanka Medical Association (SLMA) SLCTR is a registry for clinical trials involving human subjects conducted in Sri Lanka or overseas, established and operated by the Sri Lanka Medical Association. It is a not-for-profit registry with free and open access for researchers, clinicians and the general public, and any trial testing the efficacy of a health care intervention in human participants requires registration. Trial registry Open access