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The approvals process for clinical trials

Last updated on 28 Apr 2026

The following pages give you guidance on how the 2025 clinical trials regulations change how applications and modifications for clinical trials of investigational medicinal products (CTIMPs) are processed and approved:

  • the approvals process for applications
  • the approvals process for modifications (amendments)
  • MHRA and REC requesting modifications post-approval
  • approvals lapsing for trials with no recruitment
  • the approvals process for Phase 1 healthy volunteer trials
Back to guidance on changes to clinical trials regulations

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  • Guidance on changes to clinical trials regulations
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