if you're still using a vial and syringe, ask your healthcare provider about the benefits of flexpen. flexpen is a discreet, pre-filled, dial-a-dose insulin pen. you can dial the exact dose of insulin you need. and inject insulin by pressing a button. novolog mix 70/30 is an insulin used to control high blood sugar in adults with diabetes. do not inject if you do not plan to eat within 15 minutes to avoid low blood sugar. tell your healthcare provider about all medicines you take and all of your medical conditions, including if you are pregnant or breastfeeding. most common side effects include reactions at the injection site, weight gain, swelling of your hands and feet, and vision changes. other serious side effects include low blood sugar and low potassium in your blood. get medical help right away if you experience serious allergic reactions including body rash, trouble with breathing, fast heartbeat, sweating, or if you feel faint. flexpen is made by novo nordisk, a healthcare company committed to diabetes care for nearly 90 years. i've made flexpen part of my routine just like spending time with my family. ask your healthcare provider