Most people with Type 1 diabetes need at least two insulin shots a day for good blood sugar control. Many diabetics take three or four shots a day. Insulin cannot be taken as a pill because it is a protein and would be digested before reaching the blood stream. However, injections are not the only option -- a growing number of people get their insulin through an insulin pump, which is worn like a pager and described at the end of this step.
For those using injections, here's what you need to know:
- When to give the injections
- How to prepare the injections
- How to inject the insulin
- How to store the insulin
Helpful Handouts
Print out an insulin schedule for quick reference
People respond differently to insulin — and different types of insulin work at different speeds. Your doctor will determine the best insulin for your situation.
Insulin is divided into five categories, depending on how fast it works:
| Insulin Type |
Begins working in... |
Duration |
| Quick acting |
15 minutes |
3 to 5 hours |
| Short acting |
30 to 60 minutes |
5 to 8 hours |
| Intermediate acting |
1 to 3 hours |
18 to 24 hours |
| Long acting |
4 to 8 hours |
24 to 36 hours |
| Combination mixture |
30 minutes |
16 to 24 hours |
Injecting insulin: where and when
Insulin is injected into fat just under the skin using a small needle. There are several places in the body where it can be injected. Insulin works fastest when injected near the stomach, medium speed when injected into the arm, and slowest when injected into the thigh or buttocks. Your doctor will discuss these methods with you.
Rotate the injection sites to give the skin time to recover at each spot. Always inject into fatty tissue, never muscle.
Depending on the type of insulin, injections need to be done 15 to 30 minutes before mealtime as directed by the doctor.
Other injection methods
Several other devices are available for people who prefer not to use a regular needle and syringe:
- Insulin pen injectors -- The insulin pen looks like an ink pen with a cartridge. On one end is a small needle, on the other is a plunger that you press to deliver the insulin under the skin. A dial on the cartridge allows you to select your desired dosage of insulin. Although it can cost more than a regular needle and syringe, the pen injector is a convenient and accurate device for using insulin. It can be a good choice for people who do not feel comfortable using a needle and syringe in public or at school or work.
- Insulin jet injectors -- This device releases a fine spray of insulin at such a fast speed that the insulin passes directly through the skin. Jet injectors are great for people who don't like to use needles, but they can be costly and may cause bruising, especially in thin people.
Insulin pumps
The insulin pump is a small device about the size of a pager that contains a supply of insulin. A person with diabetes can wear it in a pocket or on a belt. Thin plastic tubing leads from the device and ends with a needle that inserts just under the skin, usually around the abdomen. The pump delivers a small, steady amount of insulin all the time -- this is called the "basal" dose. In addition, you give an extra dose (a "bolus") before meals. A pump has programming and data tracking capabilities.
Pumps can help some people avoid glucose swings, control glucose during the hours you sleep, and overall provide tighter control of glucose levels. They allow a more flexible meal and activity schedule.
The pump is a very convenient method of insulin delivery, but like anything else there are drawbacks. The tube can become clogged or the needle can slip out, the insertion point can become infected, and there's a higher risk of ketoacidosis (described in step 10). It also requires frequent monitoring of blood glucose.
Despite these drawbacks, the number of people using insulin pumps is growing steadily. Some people love them; others try a pump and then go back to injections. There is usually a period of adjustment to using it and having it on the body all the time.
An implantable pump is available in Europe, with U.S. distribution pending (as of summer 2002).
| As seen in an enlarged view of the skin, insulin is delivered into the fatty layer of the skin to help control the levels of glucose in the blood. |
On the way
Probably the biggest development in insulin delivery is the "inhaler." These small devices, which are similiar to an asthma inhaler, allow you to literally breath in a dose of rapid-acting insulin. As of summer 2002, they are not commercially available, but they appear to be in the final stages of testing. Ask your physician about them.
Finally, researchers are investigating the feasibility of skin patches, which give a continuous low dose of insulin. The extra dose before meals is administered by pulling a tab off the patch. These are not yet available as of summer 2002.
