The European Medicines Agency (EMA) oversees the centralized marketing authorization procedure for medicinal products across the EU. While this procedure provides a single authorization valid throughout the EU, country-specific requirements must still be met. This article examines key regulatory requirements for registering and maintaining EU-authorized medicines in Spain. It explores the registration steps and marketing authorization holder (MAH) responsibilities, including labeling, pharmacovigilance, anticounterfeiting measures, pricing and reimbursement, and requirements for promotional materials. The article provides practical insights into navigating the Spanish regulatory landscape within the broader EU framework, offering regulatory professionals a comprehensive guide to facilitate successful market access and ongoing compliance.