that can give you blood sugar control for up to 24 hours. and levemir® helps lower your a1c. levemir® lasts 42 days without refrigeration. that's 50% longer than lantus®, which lasts 28 days. levemir® comes in flextouch, the latest in insulin pen technology from novo nordisk. levemir® is a long-acting insulin used to control high blood sugar in adults and children with diabetes and is not recommended to treat diabetic ketoacidosis. do not use levemir® if you are allergic to any of its ingredients. the most common side effect is low blood sugar, which may cause symptoms such as sweating, shakiness, confusion, and headache. severe low blood sugar can be serious and life-threatening. ask your doctor about alcohol use, operating machinery, or driving. other possible side effects include injection site reactions. tell your doctor about all medicines you take and all of your medical conditions. check your blood sugar. your insulin dose should not be changed without asking your doctor. get medical help right away if you have trouble breathing,