Information about applying to conduct a clinical trial.
General information
General information about conducting a clinical trial in the UK.
Additional information
Additional information about conducting a clinical trial.
Withdrawal of a Clinical Trial Authorisation
Applicants may withdraw their request for a Clinical Trial Authorisation (CTA) at any point prior to the MHRA having reached a decision on authorisation.
What to send
Details of what you need to send us when making a clinical trial application.
Applications requiring expert advice
Information about applications that require expert advice.
Changes to the submitted documentation during evaluation
Following the submission of a request for a Clinical Trial Authorisation (CTA), the applicant may submit updated or additional supporting documentation prior to the MHRA assessors commencing their assessment of the application.
Go to changes to the submitted documentation during evaluation page
