<qa>  What is metformin often used in?Further, metformin decreases hepatic glucose production and results in weight loss. Compared to available drugs that act similarly, only metformin has weight-lowering activity, perhaps by increasing nitric oxide production and improving insulin sensitivity. It is also possible that the mild gastrointestinal side effects of metformin induce weight loss. Metformin is therefore often the agent of choice in obese, type 2 diabetics. In a study of non-diabetic obese adults, treatment with metformin resulted in decreased food intake, and decreased body weight and fat. 