A nurse is assessing a client who is taking levothyroxine. The nurse should recognize that which of the following findings is a manifestation of levothyroxine overdose?
A.
Hypoactive deep-tendon reflexes
B.
Drowsiness
C.
Insomnia
D.
Constipation
The Correct Answer and Explanation is:
The correct answer is C. Insomnia.
Levothyroxine is a synthetic form of the thyroid hormone thyroxine (T4) used to treat hypothyroidism, a condition in which the thyroid gland does not produce enough thyroid hormone. The goal of levothyroxine therapy is to restore normal thyroid hormone levels, which regulate metabolism, energy levels, and other critical bodily functions. However, excessive doses of levothyroxine can lead to symptoms of hyperthyroidism, or an overactive thyroid, because the body has more thyroid hormone than it needs.
Why Insomnia is a Symptom of Overdose
One of the primary symptoms of hyperthyroidism is insomnia, as excessive thyroid hormone speeds up many bodily functions, including the nervous system. This overstimulation can lead to difficulties falling or staying asleep, resulting in insomnia. This is a common indicator that the dose of levothyroxine may be too high, and the client is experiencing symptoms of thyroid hormone excess.
Other Symptoms of Levothyroxine Overdose
In addition to insomnia, other signs and symptoms of levothyroxine overdose include:
- Tachycardia (rapid heart rate): Excess thyroid hormone increases heart rate and can lead to palpitations.
- Weight loss: The metabolic rate increases, leading to unintentional weight loss.
- Nervousness or anxiety: Overactivity of the thyroid can cause jitteriness or heightened anxiety.
- Tremors: The nervous system becomes overstimulated, potentially causing tremors in the hands.
- Heat intolerance: Clients may feel excessively warm because their metabolism is in overdrive.
- Diarrhea: Overstimulation of the gastrointestinal system may result in increased bowel motility.
Incorrect Options:
- A. Hypoactive deep-tendon reflexes: This is typically a symptom of hypothyroidism, not an overdose of levothyroxine.
- B. Drowsiness: Hypothyroidism is more likely to cause drowsiness, while hyperthyroidism and levothyroxine overdose can lead to insomnia and restlessness.
- D. Constipation: Constipation is associated with hypothyroidism, while diarrhea is more likely with excessive thyroid hormone levels.
In summary, insomnia is a key indicator of levothyroxine overdose due to its role in accelerating the nervous system and metabolism. Nurses must monitor clients for symptoms of hyperthyroidism to adjust medication dosages as necessary.