Which antidiabetic medication is indicated for the treatment of type 2 diabetes?

Sitagliptin phosphate is a medication specifically designed for the management of type 2 diabetes. It functions as a DPP-4 inhibitor, which works by increasing the levels of incretin hormones in the body. These hormones play a crucial role in regulating blood sugar levels by stimulating insulin secretion from the pancreas when glucose levels are elevated and reducing the amount of glucose produced by the liver. This mechanism helps to improve glycemic control in individuals with type 2 diabetes.

The other medications listed do not have indications for treating type 2 diabetes. Eszopiclone is primarily used for the treatment of insomnia, while temazepam is also a sedative used for sleep disorders. Pramipexole dihydrochloride is used in the treatment of Parkinson's disease and restless legs syndrome, not diabetes. Therefore, sitagliptin phosphate stands out as the only appropriate choice for managing type 2 diabetes.