Autoinjector (or Auto-injector)

An autoinjector (or auto-injector) is a medical device designed to deliver a single dose of a particular (typically life-saving) drug.

Most autoinjectors are spring-loaded syringes. By design, autoinjectors are easy to use and are intended for self-administration by patients. The site of injection depends on the drug loaded, but it typically is administered into the thigh or the buttocks. The injectors were initially designed to overcome the hesitation associated with self-administration of the needle-based drug delivery device.