Thyroid Hormone Medicines for Hypothyroidism
Thyroid hormones are taken by mouth (orally) except in unusual cases, such as myxedema coma. That condition requires intravenous (IV) medicine. Dosages vary with the person's age and the severity of the disease.
How It Works
People with hypothyroidism have lower-than-normal or no thyroid function and do not make enough thyroid hormone for the body to function properly. Taking thyroid hormone medicine replaces missing hormones.
Why It Is Used
Thyroid hormone medicines are given when blood tests show that you have hypothyroidism.
Thyroid hormone medicines also may be prescribed:
How Well It Works
People with hypothyroidism who take thyroid hormone medicine usually notice:
In most cases, thyroid hormone medicine works quickly to correct symptoms.
Myxedema coma can respond well to thyroid hormone medicine and treatment in an intensive care unit. But a good outcome depends on how soon treatment starts.
In general, you will not have side effects if you are taking the correct amount of thyroid hormone medicine.
Side effects of too much thyroid medicine include:
Report any side effects to your doctor.
If you have coronary artery disease and you take too much thyroid medicine, symptoms such as chest pain (angina) or heart rhythm irregularities (arrhythmia) may get worse. Also, you may have an increased risk of heart attack.
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About
Thyroid hormones work best when they are taken as prescribed. It is best to take your thyroid medicine on an empty stomach. If you have trouble taking your thyroid medicine as prescribed, talk to your doctor.
Keep follow-up visits with your doctor to make sure you are taking the medicine correctly. Your doctor also may need to adjust your dose. Most people return to their doctor for blood tests to measure hormone levels 6 to 8 weeks after starting therapy. After thyroid hormone levels have returned to normal, thyroid function tests are checked once a year.
Certain medicines can affect the way thyroid medicines work. People taking the following medicines need to see their doctor often to make sure they are getting the correct dose of thyroid hormone medicine. Some of these medicines include:
People with Hashimoto's thyroiditis, the most common cause of hypothyroidism, often need treatment for the rest of their lives.
People who have other health conditions in addition to hypothyroidism, particularly coronary artery disease, may sometimes develop problems if they are started on a large dose of thyroid hormone. These people are often started on a lower dose that is carefully increased.
If an infant has intellectual disability from hypothyroidism, thyroid hormone medicine will control symptoms of hypothyroidism but will not reverse the intellectual disabilities.
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