Lantus (insulin glargine) is a man-made hormone that is used to treat Diabetes Type 1 and Diabetes Type 2. The drug is a form of insulin that controls blood sugar levels in individuals suffering from diabetes. Though there is no cure for diabetes, treatment with insulin, diet, and exercise can help diminish its effects. Lantus is a medicine used in the treatment of type 2 diabetes. The medicine is a long-acting formulation of insulin, meaning it needs only be administered once daily. Its effects last, on average, between 18 and 26 hours. The active ingredient of Lantus, insulin glargine, is a variant of insulin which mimics the effects of natural insulin in the body. In this way, the patient can control their blood sugar levels by administering Lantus just after the consumption of food. Lantus is associated with its own range of potential side effects. Among these effects include low blood sugar, swelling, weight gain, and cold-like symptoms.