So, working with your doctor, you have to find the right insulin or combination that works for you. Your insulin choice should dovetail with your eating and exercise patterns, so it's important for you to plan your insulin intake with your doctor or diabetes educator. Most people who use insulin inject it with a needle and syringe, but there are several other devices that are available. These are handy if you want the convenience of carrying insulin with you in a discreet way. An insulin pen looks like a cartridge pen.
Some pens use replaceable cartridges of insulin and other models are disposable.
The tip of the pen has a fine, short needle. Users turn a dial to select the desired dose of insulin and press a plunger on the end to deliver the insulin. These are great for people who fear needles, but they're expensive and you have to boil and sterilize the units frequently. These connect to narrow, flexible plastic tubing that ends with a needle inserted just under the skin near the abdomen. The insulin pump is about the size of a deck of cards, weighs about 3 ounces, and can be worn on a belt or in a pocket.