sitagliptin, an oral antidiabetic. ▪ INDICATIONS: This drug is used alone or in combination with other antidiabetic agents to treat type 2 diabetes mellitus. ▪ CONTRAINDICATIONS: Diabetic ketoacidosis and known hypersensitivity to this drug prohibit its use. ▪ ADVERSE EFFECTS: Adverse effects of this drug include hypoglycemia and abdominal pain. Common side effects include headache, nausea, and vomiting.