Evaluate the compliance of practices of nursing professionals related to the preparation and administration of drugs in 2018. Discuss the evolution of compliance practices from 2014 to 2018.Prospective transversal observational study. Based on an observation grid with 55 compliance criteria, we conducted direct observation of medication doses prepared and administered by nursing professionals. For each compliance criterion, the auditor could indicate whether the practice was compliant, non-compliant or not applicable. A convenience target of 250 observations has been set.A total of 252 doses of drugs were observed between March 1, 2018 and April 29, 2018. Drug doses were observed by day (52 %), evening (30 %) or night (18 %) mainly nurses (80 %) working on regular shifts (94 %). Just over half of the doses required preparation by a nurse (58 %) and almost half of the doses were administered parenterally (48 %). In 2018, the observed compliance rate of the drug circuit ranged from 25.0 % to 86.3 %.This descriptive study shows a compliance rate of practices of nursing professionals related to the preparation and administration of drugs, which varies from 25.0 % to 86.3 % by observed stage of the drug circuit. 2018. The study identified 15 action actions for continuous improvement.