what are side effects of lantus insulin?
Lantus | insulin glargine [rDNA origin] injection side effects and adverse reactions include: 1  Allergic reaction. 2  Hypoglycemia. 3  Discomfort at the injection site.
Common Lantus side effects may include: 1  low blood sugar; 2  itching, mild skin rash; or. 3  thickening or hollowing of the skin where you injected the medicine.