Final answer:
The nurse should instruct the client taking metformin XR for type II diabetes mellitus to take the medication as prescribed, educate about potential side effects and symptoms of hypo- and hyperglycemia, and emphasize the importance of lifestyle modifications.
Step-by-step explanation:
The nurse should instruct the client taking metformin XR for type II diabetes mellitus to take the medication as prescribed by their healthcare provider. They should emphasize the importance of taking the medication regularly and at the proper dosage. The nurse should also educate the client about potential side effects and symptoms of hypoglycemia and hyperglycemia, as well as when to seek medical attention. Additionally, the nurse should emphasize the importance of lifestyle modifications, such as maintaining a healthy diet, engaging in regular physical activity, and monitoring blood glucose levels regularly.