On February 20, 2018, Monika Duszyńska performed at the conference organized by Medical Pro Events. She raised a topic of the rules of the interchangeability of biological medicines which raises a number of doctors’ and patients’ concerns, including whether the patient’s consent is required to change the medicine, what factors should be taken into account in the event of a possible change in therapy, how interchangeability is perceived by EU bodies and Member States of the European Union. Monika also talked about the guidelines of selected countries in the world concerning the principles of using biological medicines and about the latest clinical trials and scientific articles in this field.