A nurse is teaching a client with a new prescription for metformin (Glucophage). Which of the following findings should the nurse instruct the client to report as an adverse effect of metformin? (Select All That Apply.)

The correct answer is B: Somnolence. Metformin does not typically cause hypoglycemia as it works by reducing glucose production in the liver. Fluid retention is not a common adverse effect of metformin. Hyperglycemia is the condition metformin is used to treat, so it would not be an adverse effect. Somnolence, or drowsiness, can occur as a side effect of metformin and may indicate a possible adverse reaction that should be reported to the healthcare provider to ensure appropriate management.