levemir® comes in flextouch® the only prefilled insulin pen with no push-button extension. levemir® lasts 42 days without refrigeration. that's 50% longer than lantus® which lasts 28 days. today i'm asking about levemir® flextouch®. 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 levels. your insulin dose should not be changed without asking your doctor. get medical help right away if you have trouble breathing