A client is newly prescribed with metformin (Glucophage) for type 2 diabetes.Which of the following statements indicate that the client understands the teaching of metformin?

Metformin is used as a first-line medication for type 2 diabetes.

Metformin interacts with contrast dye which can increase the risk of acute renal failure.

Metformin is used to increase blood glucose.

Metformin does not cause weight gain.