Janumet 50/500mg is a combination medication containing sitagliptin phosphate and metformin HCl. This prescription medication comes in a package of 56 tablets and is manufactured by MSD. It is used for the management of type 2 diabetes. Each tablet contains 50mg sitagliptin phosphate and 500mg metformin hydrochloride as the active ingredients. The medication combines two diabetes medicines in a single tablet to help control blood sugar levels. As this is a prescription medication, it should only be taken under the supervision and guidance of a healthcare provider.