The STOP-IATRO project, which brings together 6 organizations from 3 European countries, aims to raise awareness among healthcare professionals about the risks of iatrogenesis in older people. Through collective strategies based on WHO recommendations, the project seeks to prevent medical complications that can lead to a loss of autonomy. It focuses on identifying obstacles, developing an inclusive strategy, providing training programs, and carrying out pilot actions to improve the quality of care and prevent the adverse effects of medical treatments.