Does insulin cause side effects?
Insulin can cause weight gain and low blood sugar. Taking too much insulin can cause blood sugar to drop too low. This can be dangerous. That’s why it’s important to always check blood sugar before you take an insulin shot. View the original Insulin and diabetes: your questions answered article on myOptumHealth.com SOURCES: • U.S. Food and Drug Administration. Diabetes information: insulin. • National Diabetes Information Clearinghouse. What I need to know about diabetes medicines. • American Diabetes Association. About insulin and other drugs.