A nurse is collecting data from a client who has been taking methimazole for 2 months for the treatment of a thyroid imbalance. Which of the following findings indicates that the medication is effective?

A. Weight gain: Methimazole is used to treat hyperthyroidism, and effective treatment often leads to weight gain, as metabolism normalizes. B. Decreased menstrual flow: Methimazole can affect menstrual cycles, but decreased flow is not an indicator of effectiveness. C. Clear breath sounds: This is not related to the effectiveness of methimazole. D. Increased libido: Changes in libido are not a direct indicator of methimazole’s effectiveness.