Levothyroxine sodium is prescribed for a client with hypothyroidism. The nurse should instruct the client to report which symptom because it indicates that the client is taking too much levothyroxine sodium?

A. Bradycardia: This is a classic symptom of hypothyroidism (underactive thyroid). Levothyroxine is meant to increase the heart rate; therefore, a slow heart rate suggests the dose may actually be too low, not too high. B. Somnolence: Excessive fatigue and sleeping are signs that the metabolic rate is still too slow. If a patient is taking too much medication, they would experience the opposite—heightened energy or restlessness. C. Insomnia: Because Levothyroxine mimics the body’s "metabolic gas pedal," an excessive dose leads to symptoms of hyperthyroidism. This includes insomnia, palpitations, tremors, heat intolerance, and tachycardia. The body is effectively in "overdrive," making it difficult to rest. D. Constipation: This is another hallmark of an underactive metabolism. An overdose of Levothyroxine would more likely cause frequent bowel movements or diarrhea due to increased gastrointestinal motility.