Please ensure that you follow all of the correct guidelines when it comes to disposing of your already used needles. Used needle can pass disease and other infections on to persons if the needle was to be reused. Also never carry the needle with the insulin kept attached to it, as in doing this you may affect the accuracy of the dose, which the needle will deliver when the time comes to inject your medication. You should also use a different injection site, each time you are to administer a dose. Make sure that each injection site is a minimum of 1 inch away from the last injection site. You should attempt to use all available injection sites on a specific area of your body before moving to another part of the skin.