Diabetes Home > Humulin R Side Effects

At this time, only vague information is available about Humulin R side effects. Common side effects of the drug may include changes in blood sugar levels and injection site skin reactions. Some side effects of Humulin R are potentially serious and should be reported to your healthcare provider, including wheezing or difficulty breathing (signs of an allergic reaction) or shakiness, blurry vision, or extreme hunger (signs of low blood sugar).

An Introduction to Humulin R Side Effects

As with any medicine, side effects are possible with Humulin® R (regular insulin). The most important side effect that can occur with Humulin R is low blood sugar, although other side effects are also possible.
(This article covers many, but not all, of the possible side effects with Humulin R. Your healthcare provider can discuss a more complete list of Humulin R side effects with you.)

Possible Side Effects of Humulin R

Because Humulin R is a non-prescription medication, little information is available about its possible side effects. For prescription medications, detailed side effect data is provided by the manufacturer. However, such data is not given for non-prescription medications. As a result, only vague side effect information is available.
Based on this information, possible side effects of Humulin R include:
  • Low blood sugar levels (hypoglycemia) if too much is taken
  • High blood sugar levels (hyperglycemia) if too little is taken
  • A skin reaction at the site of the injection
  • Skin thickening or pitting at the site of the injection.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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