SPL Set ID: 90c0244b-afb3-4e69-b79f-486d002ca432

JANUMET XR tablets for oral use contain two antihyperglycemic medications: sitagliptin and metformin extended-release. Sitagliptin Sitagliptin is an orally-active inhibitor of the dipeptidyl peptidase-4 (DPP-4) enzyme. Sitagliptin phosphate monohydrate drug substance is used to manufacture JANUMET XR. Sitagliptin phosphate monohydrate is described chemically as 7-[(3R)-3-amino-1-oxo-4-(2,4,5-trifluorophenyl)butyl]-5,6,7,8-tetrahydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-α]pyrazine phosphate (1:1) monohydrate with an empirical formula of C 16 H 15 F 6 N 5 O•H 3 PO 4 •H 2 O and a molecular weight of 523.32. The structural formula is: Sitagliptin phosphate monohydrate is a white to off-white, crystalline, non-hygroscopic powder. It is soluble in water and N,N-dimethyl formamide; slightly soluble in methanol; very slightly soluble in ethanol, acetone, and acetonitrile; and insoluble in isopropanol and isopropyl acetate. image of sitagliptin chemical structure Metformin Metformin HCl ( N , N -dimethylimidodicarbonimidic diamide HCl) is a white to off-white crystalline compound with a molecular formula of C 4 H 11 N 5 •HCl and a molecular weight of 165.63. Metformin HCl is freely soluble in water and is practically insoluble in acetone, ether, and chloroform. The pK a of metformin HCl is 12.4. The pH of a 1% aqueous solution of metformin HCl is 6.68. The structural formula is as shown: image of metaformin chemical structure JANUMET XR JANUMET XR is available as film-coated tablets containing: 64.25 mg sitagliptin monohydrate equivalent to 50 mg sitagliptin and 389.93 mg of metformin equivalent to 500 mg metformin HCl (JANUMET XR 50/500). 64.25 mg sitagliptin monohydrate equivalent to 50 mg sitagliptin and 779.86 mg of metformin equivalent to 1000 mg metformin HCl (JANUMET XR 50/1000). 128.5 mg sitagliptin monohydrate equivalent to 100 mg sitagliptin and 779.86 mg of metformin equivalent to 1000 mg metformin HCl (JANUMET XR 100/1000). All doses of JANUMET XR contain the following inactive ingredients: povidone, hypromellose, colloidal silicon dioxide, sodium stearyl fumarate, propyl gallate, polyethylene glycol, and kaolin. The JANUMET XR 50 mg/500 mg tablet contains the additional inactive ingredient microcrystalline cellulose. In addition, the film coating for all doses contains the following inactive ingredients: hypromellose, hydroxypropyl cellulose, titanium dioxide, FD&C #2/Indigo Carmine Aluminum Lake and carnauba wax. The JANUMET XR 50 mg/1000 mg tablet film coating also contains the inactive ingredient yellow iron oxide.