Sitagliptin may not work as well when you use other medicines at the same time. Many other drugs can also affect blood sugar control.
You may be more likely to have low blood sugar if you also use insulin.
Other drugs may affect sitagliptin, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all your current medicines and any medicine you start or stop using.
 Sitagliptin drug interactions (more detail)
