januvia should not be used in patients with type 1 diabetes or diabetic ketoacidosis. tell your doctor if you have a history of pancreatitis. serious side effects can happen, including pancreatitis which may be severe and lead to death. stop taking januvia and call your doctor right away if you have severe pain in your stomach area which may be pancreatitis. tell your doctor right away and stop taking januvia if you have an allergic reaction that causes swelling of the face, lips, tongue, or throat, or affects your breathing or causes rash or hives. kidney problems sometimes requiring dialysis have been reported. using januvia and a sulfonylurea or insulin together may cause low blood sugar. to reduce the risk, your doctor may prescribe a lower dose of the sulfonylurea or insulin. your doctor may perform blood tests before and during treatment to check your kidneys. if you have kidney problems a lower dose may be prescribed. side effects may include upper respiratory tract infection, stuffy or runny nose and sore throat, and headache. for help lowering your blood sugar talk to your doctor about januvia today.