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Liotrix is a man-made form of a hormone that is normally produced by your thyroid gland to regulate the body's energy and metabolism. Liotrix is given when the thyroid does not produce enough of this hormone on its own.

Liotrix treats hypothyroidism (low thyroid hormone). Liotrix is also used to treat or prevent goiter (enlarged thyroid gland), and is also given as part of a medical tests for thyroid disorders.

Liotrix should not be used to treat obesity or weight problems.

Liotrix may also be used for purposes not listed in this medication guide.

Since thyroid hormone occurs naturally in the body, almost anyone can take liotrix. However, you may not be able to use this medication if you have a thyroid disorder called thyrotoxicosis, or an adrenal gland problem that is not controlled by treatment.

Before taking liotrix, tell your doctor if you have heart disease, angina (chest pain), coronary artery disease, congestive heart failure, diabetes, or problems with your pituitary or adrenal glands.

Tell your doctor if you are pregnant or breast-feeding.

To be sure this medication is helping your condition, your blood may need to be tested often. Visit your doctor regularly.

Keep using this medicine as directed, even if you feel well. You may need to take thyroid medication for the rest of your life.

Call your doctor if you notice any signs of thyroid toxicity, such as chest pain, fast or pounding heartbeats, feeling hot or nervous, or sweating more than usual.

Since thyroid hormone occurs naturally in the body, almost anyone can take liotrix. However, you may not be able to use this medication if you have a thyroid disorder called thyrotoxicosis, or an adrenal gland problem that is not controlled by treatment.

To make sure you can safely take liotrix, tell your doctor if you have any of these other conditions:

• heart disease, angina (chest pain);
• coronary artery disease;
• congestive heart failure;
• any type of diabetes; or
• problems with your pituitary or adrenal gland.

FDA pregnancy category A. Liotrix is not expected to harm an unborn baby. However, tell your doctor if you become pregnant, since your dose needs may be different during pregnancy.

Small amounts of liotrix can pass into breast milk, but this is not expected to harm a nursing baby. However, do not use this medication without telling your doctor if you are breast-feeding a baby.

Liotrix is a man-made form of a hormone that is normally produced by your thyroid gland to regulate the body's energy and metabolism. Liotrix is given when the thyroid does not produce enough of this hormone on its own.

Liotrix treats hypothyroidism (low thyroid hormone). Liotrix is also used to treat or prevent goiter (enlarged thyroid gland), and is also given as part of a medical tests for thyroid disorders.

Liotrix should not be used to treat obesity or weight problems.

Liotrix may also be used for purposes not listed in this medication guide.

Since thyroid hormone occurs naturally in the body, almost anyone can take liotrix. However, you may not be able to use this medication if you have a thyroid disorder called thyrotoxicosis, or an adrenal gland problem that is not controlled by treatment.

To make sure you can safely take liotrix, tell your doctor if you have any of these other conditions:

• heart disease, angina (chest pain);

• coronary artery disease;

• congestive heart failure;

• any type of diabetes; or

• problems with your pituitary or adrenal gland.

FDA pregnancy category A. Liotrix is not expected to harm an unborn baby. However, tell your doctor if you become pregnant, since your dose needs may be different during pregnancy.

Small amounts of liotrix can pass into breast milk, but this is not expected to harm a nursing baby. However, do not use this medication without telling your doctor if you are breast-feeding a baby.

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

Do not change brands or change to a generic drug product without first asking your doctor. Different brands of liotrix may not work the same. If you get a prescription refill and your new pills look different, talk with your pharmacist or doctor.

If you also take cholestyramine (Prevalite, Questran) or colestipol (Colestid), avoid taking these medications within 4 hours before or after you take liotrix.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Less serious side effects may include:

• headache;

• nausea;

• depression, anxiety, feeling weak or tired;

• weight gain;

• dry or itchy skin;

• joint or muscle pain; or

• temporary hair loss (especially in children).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.