Final answer:
Symptoms indicating an excessively high dosage of levothyroxine sodium in treating goiter are palpitations and shortness of breath, which point towards hyperthyroidism-like side effects.
Step-by-step explanation:
The symptoms that indicate to the nurse that the prescribed dosage of levothyroxine sodium is too high for a 26-year-old client being treated for a simple goiter are palpitations and shortness of breath. These symptoms suggest that the client may be experiencing side effects consistent with hyperthyroidism, a condition characterized by an overactive thyroid gland. In the context of levothyroxine treatment, excessive dosages can lead to signs similar to those of natural hyperthyroidism, like heart palpitations, shortness of breath, weight loss, muscle weakness, and increased sensitivity to heat.
Levothyroxine sodium is a synthetic thyroid hormone used to treat hypothyroidism, and incorrect dosing can shift the balance toward hyperthyroidism. The client's symptoms should be closely monitored and reported to a healthcare professional for appropriate dose adjustment. It is also important for the nurse to educate the client about the potential side effects of their medication and when to seek medical attention.