What is an insulin pen?
Insulin pen is a pen device, which is as thick as the blood taking pen of the blood glucose meter and the needle tube for injection. You can change the "refill", that is, the insulin refill.
The insulin pen is very convenient to use. There is a scale on it. It is clear how many units of insulin are injected each time.
The needle is very thin, just like the hair. Therefore, the injection did not hurt at all.
The insulin pen can be safely carried by plane or train.
Remember, pens with insulin refills can only be kept for one week at room temperature. Too long will affect the quality of insulin in the pen.