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Liotrix oral

Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.




WARNING: This medication must not be used to treat obesity because serious, even life-threatening, effects could occur. Excessive levels of thyroid hormone can cause irregular heartbeats, nervousness, weight loss, and insomnia.


Thyroid replacement therapy is prescribed when not enough thyroid hormone is being secreted from the thyroid gland.

How To Use

Take this medication on an empty stomach. It is usually taken as a single daily dose before breakfast. Do not stop taking this medication unless consulting with your doctor. Replacement therapy is usually taken for life. Lab tests may be done periodically to monitor the effectiveness of this medication.

Side Effects

Symptoms of low thyroid levels include fatigue, muscle aches, constipation, dry skin, weight gain, slow heart rate, sensitivity to cold or dry, brittle hair that tends to fall out easily. These symptoms should disappear as your body adjusts to the medication. If they persist or become bothersome, inform your doctor. Symptoms of high thyroid levels include headache, chest pain, fast/irregular heartbeat, shortness of breath, trembling, sweating, diarrhea or weight loss. The dose of the medication may need to be reduced. If you notice other effects not listed above, contact your doctor or pharmacist.


Before using this drug, tell your doctor your medical history, especially of: heart problems, diabetes, adrenal gland problems, allergies (including drug allergies). Avoid using thyroid drugs for weight control. Current information shows that this drug may be used during pregnancy. Small amounts of this drug are excreted into breast milk. Consult your doctor before breast-feeding.

Drug Interactions

Inform your doctor about all the medicines you use (both prescription and nonprescription), especially of: warfarin, drugs that may increase heart rate or blood pressure such as decongestants or caffeine (decongestants may be found in in over-the-counter cough-and-cold medicines), estrogen products (including estrogen-containing birth control pills), digoxin, cholestyramine, colestipol, medicines used to treat diabetes. Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include nervousness, fast heart rate, diarrhea, stomach cramps, trouble sleeping, and weight loss.


Do not share this medication with others.

Missed Dose

If you miss a dose, take as soon as remembered; do not take if it is almost time for the next dose, instead, skip the missed dose and resume your usual dosing schedule. Do not "double-up" the dose to catch up. Call your doctor if you miss 2 or more doses in a row.


Refrigerate between 36 to 46 degrees F (2 to 8 degrees C), in a tightly-closed container, away from light. Keep this and all medications away from children and pets.