“What are the side effects of insulin injection?”

The most common side effect is Hypoglycemia.

Ali A. Achira, MD

There are few to no side effect to insulin injection. In the past there were a lot of problems since insulin was from animals & could cause a lot of problems. Also needles were big & not disposable so had to be sterilized. It is much better not. Current insulins are human insulin, identical to what the body normally makes so cause no allergy or tissue damage. Today also needles are so small you can hardly feel them & syringes & needles are disposable. The main side effect today from insulin injection is low blood sugar if you take too much, or don't eat or over exercise or too high a blood sugar if you do the opposite or skip a dose. Occasionally there can be a skin reaction from the insulin but this is usually caused by not getting the needle in all the way & giving part of the dose into rather than under the skin. Giving the dose in the same place over & over (as teenagers often do) can cause lumps to form in those areas. Rotating injections sites will prevent this. Other than the above I know of no side effect from modern insulin given with modern equipment. I have been taking insulin for 27 yrs & never had a problem. You can to.

Insulin injection is safe and effective when used properly. Side effects would be weight gain, low blood sugar (if you take too much incorrectly), pain, infection, etc.

Main side effects are hypoglycemia and weight gain. If you are allergic you might develop a rash but its rare.