Insulin

Onset refers to how soon insulin starts working after it's injected or inhaled. Duration is how long the insulin continues to act to lower blood glucose (blood sugar) after it is taken.

Most insulin in vials can be at room temperature after opening for 28 days. Always check the packaging or ask your pharmacist for specific storage instructions and how long the insulin will last.

Insulin pens are typically pre-filled or designed to use specific pre-filled cartridges. They are not intended to be filled directly from a vial. Attempting to transfer insulin from a vial to a pen can result in dosing inaccuracies or contamination risks. There are reusable insulin pens designed to work with specific replaceable insulin cartridges that are inserted into the pen. These cartridges are pre-filled by the manufacturer with the correct type and amount of insulin.

An insulin pen is a pen-shaped device with a built-in insulin cartridge. It makes injections easier, more accurate, and more convenient than syringes.