The withdrawal of the United Kingdom (UK) from the European Union (EU), commonly known as Brexit, occurred on January 31, 2020, triggering a transition period until December 31, 2020, during which the UK and EU negotiated their future relationship. Brexit has brought significant changes to regulatory frameworks, particularly in the pharmaceutical sector. This article examines the transition of dossier submission procedures in the UK following Brexit, focusing on the implications for marketing authorizations (MAs) and pharmacovigilance. The Medicines and Healthcare Products Regulatory Agency (MHRA) transitioned to an independent regulatory body, establishing new guidelines for pharmaceutical companies seeking MAs in the UK. Key changes in marketing authorization routes include the conversion of centrally authorized products (CAPs) to UK MAs, the introduction of the Decentralized and Mutual Recognition Reliance Procedure (MRDCRP), and the implementation of a 150-day assessment timeline for national procedures. This article compares dossier requirements before and after Brexit in the UK and highlights pharmacovigilance requirements post-Brexit, emphasizing adjustments to reporting obligations, Qualified Person for Pharmacovigilance (QPPV) responsibilities, and the establishment of UK-specific Pharmacovigilance System Master Files (PSMFs). Additionally, it addresses the dossier Module 1 administrative information requirements to provide a comprehensive overview of the changes in regulatory procedures in the UK pharmaceutical sector following Brexit. Overall, the article aims to serve as a valuable resource for industry professionals, regulatory experts, and other stakeholders seeking clarity on the regulatory changes and their implications for pharmaceutical products in the UK following Brexit.
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