autoinjectors

An autoinjector is a compact medical device that delivers a fixed dose of medication via injection. It typically contains a prefilled cartridge or syringe, a spring-loaded needle, and a simple activation mechanism designed for one-handed use. When pressed against an appropriate injection site, the device automatically inserts the needle and releases the drug, providing rapid administration with minimal training.

Autoinjectors are designed for rapid, reliable drug delivery by patients or caregivers in urgent situations or for self-administered chronic therapy. They often incorporate safety features to prevent accidental activation and to shield the needle after use. Most are intended for single use and must be discarded after the prescribed dose or once the expiration date passes.

Common indications include emergency epinephrine autoinjectors for anaphylaxis; insulin autoinjectors used to treat diabetes; and other therapies delivered by auto-injectors, including certain medications for autoimmune diseases and neurological conditions. Naloxone autoinjectors are also available for opioid overdose in some regions.

Examples include epinephrine autoinjectors such as brand-name EpiPen and Auvi-Q, insulin delivery devices, and naloxone autoinjectors such as Evzio. Availability and device design vary by country, with some products being single-use and others reusable with replaceable cartridges.

Storage, handling, and disposal are governed by product instructions: keep at recommended temperatures, check expiration dates, replace after use, and dispose of used devices safely in accordance with local guidelines. Training and awareness are emphasized to ensure correct activation and dosing.