A client who has Graves' disease is prescribed methimazole. Which of the following effects should the nurse expect to see after the client has taken the medication for 2 months?

Methimazole is an antithyroid agent that inhibits the enzyme thyroid peroxidase, preventing the iodination of tyrosine and the synthesis of T3 and T4. It is used to manage hyperthyroidism by shifting the patient from a hypermetabolic state back toward a euthyroid physiological balance. Rationale: A. Weight loss is a clinical manifestation of the hyperthyroidism seen in Graves' disease, not an expected therapeutic effect of methimazole. As the medication successfully lowers thyroid hormone levels, the client's basal metabolic rate slows down, typically resulting in weight gain or stabilization. The nurse should expect the client to stop losing weight as the treatment becomes effective. B. An increase in pulse rate is a symptom of untreated hyperthyroidism due to the stimulatory effects of excess thyroid hormones on the cardiovascular system. Methimazole therapy should result in a decrease in heart rate as the metabolic demand lessens. If the pulse remains high, it may indicate that the dosage is not yet sufficient to control the disease. C. Increased sleeping is an expected therapeutic outcome because methimazole reduces the hypermetabolic state that causes insomnia and restlessness in Graves' disease. As thyroid hormone levels normalize, the client's central nervous system activity decreases, allowing for more restorative rest. This shift indicates that the medication is successfully reversing the thyrotoxicosis and bringing the patient toward a euthyroid state. D. Warmer skin and heat intolerance are classic signs of hyperthyroidism caused by increased thermogenesis. Methimazole works to lower the body's metabolic rate, which should result in cooler skin and an improved tolerance to ambient temperatures. If the skin remains excessively warm and moist, the client may still be in a hyperthyroid state requiring further titration of the medication.