Insulin Side Effects

Injection site skin reactions, low blood sugar levels, and high blood sugar levels are potential side effects of insulin. However, the most important side effect to be aware of is low blood sugar levels, as this can cause dangerous and even life-threatening problems. Possible signs of low blood sugar levels can include difficulty speaking, blurry vision, and seizures. Make sure to notify your healthcare provider if you experience any side effects while taking insulin.

An Introduction to Side Effects of Insulin

As with any medicine, insulin can cause side effects. The most important side effect that can occur with insulin is low blood sugar levels, although other problems are also possible. It is important to understand how to recognize and deal with the possible side effects of insulin.
 
(This article covers many, but not all, of the possible side effects with insulin. Your healthcare provider can discuss a more complete list of insulin side effects with you.)
 

Possible Insulin Side Effects

Insulin is known to cause a few different side effects, such as:
 
 
  • Low blood sugar levels (hypoglycemia) if too much is taken
  • High blood sugar levels (hyperglycemia) if too little is taken
  • Weight gain (see Insulin and Weight Gain)
  • A skin reaction at the site of the injection
  • Skin thickening or pitting at the site of the injection.
     

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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;
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