What should be monitored in a patient receiving levothyroxine?

• A. Sleep pattern
• B. Blood glucose fluctuations
• C. Blood pressure only
• D. Signs of hyperthyroidism, including weight loss and increased heart rate

Answer: (D)

When adjusting levothyroxine, the main aim is to keep thyroid hormone levels balanced so the body runs normally, avoiding both under- and over-treatment. The most informative way to gauge this clinically is by watching for signs that the dose is too high, i.e., hyperthyroidism. Symptoms like weight loss and an increased heart rate reflect an excess of thyroid hormone affecting metabolism and the cardiovascular system, signaling the need to reduce the dose. Monitoring for these hyperthyroid signs helps prevent potential risks such as tachycardia, palpitations, and bone loss from long-term over-replacement.

While sleep changes or blood glucose fluctuations can occur in some patients, they are not as specific or reliable for guiding levothyroxine dosing. Blood pressure can vary for many reasons and does not pinpoint whether thyroid hormone replacement is appropriate. Periodic lab tests (like TSH and free T4) complement clinical monitoring, but clinically observable signs of hyperthyroidism directly indicate over-replacement and are essential to watch.