Clinical Trials

Before a medicinal product can be authorised for use, it must go through the clinical trials process to ensure that it is safe and effective and also that the quality of the product is sufficient.

The HPRA is responsible for the assessment of clinical trials with medicinal products conducted in Ireland. The types of trials assessed range from first-in-man studies for new compounds to studies with products which already have marketing authorisations. 

Clinical trials begin with small studies in a controlled population of volunteers or patients and, as data are gathered, expand to large scale studies in patients. These large scale studies will often investigate the new product and the currently used treatment to see how these two compare. As information is obtained, larger numbers of patients are exposed to the new product and safety data can be collected showing the safety of the product in the intended patient population. Information on the quality of the product and its non-clinical safety will have been obtained before the clinical trial programme commences.

Details of clinical trials (except Phase 1 trials) authorised for conduct in Ireland are available on the EU CT Register.  *Use the advanced search function, and filter for ‘Ireland’.   


Clinical trials in Ireland are currently governed by the European Communities (Clinical Trials on Medicinal Products for Human Use) Regulations, 2004, SI No 190 of 2004 -

The Regulations transposed into Irish law the provisions of Council Directive 2001/20/EC

A new Clinical Trials Regulation (EU) No 536/2014 was adopted on 16 April 2014, and implementation is planned to take place in 2021. When implemented, Directive 2001/20/EC and associated laws will be repealed.

Clinical Trial Regulation (Regulation (EU) No 536/2014)

Clinical Trials Applications

Good Clinical Practice (GCP) Inspections

Reporting Serious Adverse Events

Annual Safety Reporting Requirements


Clinical Trial Regulation — National Collaboration Project

The HPRA and the National Office for Research Ethics Committees (NREC) have initiated a National Collaboration Project to prepare for the implementation of the Clinical Trials Regulation in Ireland. The National Collaboration Project will run until December 2021. 

Interested sponsors are invited to participate. The main advantages for the sponsor are that they submit the HPRA and ethics committee documents to one location, the HPRA, and if the trial is approvable will receive a single national decision within the legislative timelines.     

The Guide to Clinical Trials Regulation — National Collaboration Project explains the process in detail, which replaces the previous HPRA Pilot Project. 

Documents must be submitted in a Part I and II dossier structure, as required by the legislation. Dossier structure folders are available, and clinical trial documents can be added to the folders under the relevant headings. 

Part I dossier structure

Part II dossier structure

Substantial Modification dossier structure 

For further information, please contact or

Clinical trial and National Collaboration Project cut-off dates

A list of cut-off dates for submission of CT Applications are available below.

Subcommittee dates 2021

National Collaboration Project Clinical Trial Meeting Dates 2021