Final answer:
Metformin is commonly used for the management of Type-2 Diabetes Mellitus.
Step-by-step explanation:
The commonly used drug for the management of a patient with Type-2 Diabetes Mellitus is Metformin. This medication is an oral antidiabetic drug that works by reducing the amount of glucose produced by the liver and increasing the body's response to insulin. It is typically prescribed as a first-line treatment for type 2 diabetes and is well-tolerated by most patients.