Januvia^® (sitagliptin) is a prescription medication that has been approved to treat type 2 diabetes. The medication increases the production of insulin and decreases the amount of sugar produced by the liver. As a result, Januvia can help lower blood sugar levels, which can decrease the risks of developing long-term problems associated with diabetes, including heart disease, diabetic retinopathy, diabetic neuropathy, and diabetic nephropathy. The dosage of Januvia your healthcare provider prescribes will depend on several factors, including how well your diabetes is controlled, other medical conditions you may have, and other medications you are taking.