How to choose a needle for insulin injection? Can needles be reused? How to dispose of discarded needles? These are all important issues related to the health of patients. Questions about insulin injection needles: 1. How to choose the needle The needle can directly affect the patient’s feeling when injecting. The thinner the needle, the lower the chance of pain and bleeding. It is safer to choose a 4-6mm needle for injection. 2. Reuse of needles is strictly prohibited. Reuse of needles can cause deformation of the needle tip or even partial fracture in the body, and it is usually difficult to detect these changes with the naked eye, which can also increase injection pain and injection complications and other adverse consequences. 3. Disposal of discarded needles if there is no special back to the box, can be placed in other covered hard-shell containers, such as plastic bottles with lids; under no circumstances should sharp materials be thrown directly into the general (public) garbage bins to avoid needle-stick injuries to others.