during episodes of low blood sugar or if you're allergic to insulin. get medical help right away if you have a serious allergic reaction such as body rash or trouble breathing. don't reuse needles or share insulin pens. the most common side effect is low blood sugar, which can be life threatening. it may cause shaking, sweating, fast heartbeat, and blurred vision. check your blood sugar levels daily. injection site reactions may occur. don't change your dose of insulin without talking to your doctor. tell your doctor about all your medicines and medical conditions. check insulin label each time you inject. taking tzds with insulins, like toujeo®, may cause heart failure that can lead to death. find your rhythm and keep on grooving. ♪ let's groove tonight. ask your doctor about toujeo®. ♪ share the spice of life.