Carefully replace the Outer Needle Cap only. Remove the needle after the injection. Use the Outer Needle Cap to twist the needle off. Safely dispose of the needle in an appropriate container. Note: Always replace the Pen Cap on the Pen Body after use. OptiClik® can be stored with the Cartridge System attached until it is time for the next injection. Store at room temperature away from direct heat and sunlight. Do not refrigerate.