Insulinepen

Insulinepen, or insulin pen, is a handheld device used to deliver insulin to people with diabetes. It combines a reservoir or cartridge of insulin with a dose-setting mechanism, a plunger, and a needle. Pens can be disposable with pre-filled insulin or reusable with replaceable cartridges and compatible insulin cartridges.

How it works: A new sterile needle is attached for each injection. The user primes the pen to remove air and ensure insulin flow, selects the dose by turning a dial, and administers the injection by pressing a button or plunger. Doses are typically measured in insulin units. The device is designed to deliver a precise, subcutaneous injection and is often used as part of basal-bolus or premixed insulin regimens.

Types and use: Insulin pens are used for both type 1 and type 2 diabetes, and sometimes for gestational diabetes. They are valued for portability, convenience, discreet use, and the potential for more accurate dosing compared with vials and syringes. Proper technique and site rotation (abdomen, thigh, arm, or buttock) help with absorption and comfort.

Storage and safety: Unopened pens are usually stored in a refrigerator. After first use, many pens may be kept at room temperature for a limited period according to the manufacturer’s guidance; exposure to heat or light should be avoided. Always use a new needle for each injection and dispose of needles in an appropriate sharps container. Follow healthcare provider instructions for dosing and storage, and check insulin compatibility and expiration dates.

See also: insulin therapy, diabetes management.