Venous catheters have become essential devices in the management of hospitalized patients. Indeed, according to several studies, 60 to 70 % of hospitalized patients require venous access during their stay. However, there is a wide range of venous catheters, and it is important to understand their main differences and indications. The main factors to consider for the choice are the degree of urgency, the expected duration of catheter maintenance, the number of infusions to be administ red, and the toxicity of the medication to the vascular endothelium.