This European Commission document is written for patients who want information about biosimilar medicines. Its purpose is to answer some of the questions that patients may have about these medicines. It is written by and for patients in collaboration with the European Medicines Agency, the European Commission and its main stakeholders (European Patient Forum (EPF), European Federation of Crohn's and Ulcerative Colitis Associations (EFCCA), European Physicians Committee (CPME), European Federation of the Innovative Pharmaceutical Industry (EFPIA), European Association of Bio-industries (EuropaBio) and Medicines for Europe.