Janumet 50 1000 (see details) is the brand name (and dosage level) of sitagliptin-metformin, a combination prescription drug used in the management of type 2 diabetes. (50 refers to 50 mg of sitagliptin while 1000 refers to 1000 mg of metformin.) In addition to diet and exercise, Janumet 50 1000 is prescribed when the use… Continue reading Janumet Side Effects: What patients say.