On February 20, 2018, Monika Duszyńska appeared at a conference organized by Medical Pro Events, during which she moved, among others Subject of the principles of replacement of biological drugs. The interchange of biological drugs raises a number of questions from doctors and patients, including Whether the patient's consent to change the drug is required, what factors should be taken into account in the possible change of therapy, how the EU bodies and European Union Member States approach the interchange. Monika also talked about the guidelines of selected countries of the world regarding the principles of using biological drugs, the latest clinical studies and articles on scientific literature on this issue.