Levothyroxine

Definition

Levothyroxine is a synthetic form of the thyroid hormone thyroxine (T4) used to treat hypothyroidism. It helps restore the body's natural hormone levels, improving metabolism and energy.

5 Must Know Facts For Your Next Test

1. Levothyroxine should be taken on an empty stomach, usually 30-60 minutes before breakfast for optimal absorption.
2. It is crucial to monitor thyroid function tests regularly to adjust dosages effectively.
3. Certain foods and supplements, like calcium and iron, can interfere with levothyroxine absorption if taken simultaneously.
4. Patients may need lifelong therapy with levothyroxine depending on their underlying condition.
5. Symptoms of overdosage can include weight loss, increased appetite, anxiety, and heart palpitations.

Review Questions

• Why should levothyroxine be taken on an empty stomach?
• Which nutrients can interfere with the absorption of levothyroxine?
• What are some symptoms that may indicate a patient is taking too much levothyroxine?

Related terms

Hypothyroidism: A condition where the thyroid gland does not produce enough thyroid hormones.

Thyroid Function Tests: Blood tests used to measure how well the thyroid gland is working.

Goiter: An abnormal enlargement of the thyroid gland often due to iodine deficiency or thyroid dysfunction.