BackgroundIntravenous medication errors are common in hospital settings particularly emergency department. This study aimed to determine intravenous medication preparation and administration errors, contributing factors, tendency towards making errors and knowledge level of emergency department healthcare workers. MethodsA cross-sectional study using a structured, direct observation method was conducted. It was conducted with 23 emergency healthcare workers working in the emergency department of a university hospital in Turkey. Data were collected by questionnaires: Knowledge Test on Intravenous Medication Administration, Intravenous Drug Administration Standard Observation Form, Drug and Transfusion Administration Sub-Dimension scale, Perceived Stress Scale and Pittsburgh Sleep Quality Index. ResultsIt was determined that the knowledge level of the emergency healthcare workers about intravenous medication administration was moderate, and the tendency mistakes regarding drug and transfusion applications was very low. There was no relationship between education level, years of work, years of work in the emergency department, perceived stress level and sleep quality, and the tendency of making mistakes in drug and transfusion applications. ConclusionIt is important for patient safety to prevent medication errors by determining the factors affecting intravenous medication administration, tendency to make mistakes and knowledge levels, which are frequently used in emergency department.