"Oct. 28, 2011 - Nine out of 10 "thyroid support" pills tested by Mayo Clinic researchers contain "risky" levels of thyroid hormones.
A wide range of supplements that claim to support or improve thyroid function are available online an"...
Levothroid Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Levothroid (levothyroxine sodium) treats hypothyroidism (low thyroid hormone). It is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer. Levothroid is a replacement for a hormone that is normally produced by your thyroid gland to regulate the body's energy and metabolism. Common side effects include hair loss during the first few months of treatment. This effect is usually temporary as your body adjusts to this medication.
For adult hypothyroidism, Levothroid is started at 12.5-125 mcg/day taken orally. Dose may differ with individuals based on age, the presence of cardiovascular disease, tolerance, side effects, and blood levels of thyroid hormone. It may take one to three weeks before effects are seen. Levothroid may interact with calcium carbonate, ferrous sulfate iron supplement, sucralfate, sodium polystyrene sulfonate, antacids that contain aluminum, and cholesterol-lowering drugs. Tell your doctor all medications or supplements you are taking. Current information shows that Levothroid may be used during pregnancy. Tell your doctor if you are pregnant as your dose may need to be adjusted. This medication passes into breast milk but is unlikely to harm a nursing infant. Consult your doctor before breast-feeding.
Our Levothroid (levothyroxine sodium) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
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.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Levothroid in Detail - Patient Information: Side Effects
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.
Call your doctor at once if you have a serious side effect such as:
- sleep problems (insomnia);
- feeling nervous or irritable;
- fever, hot flashes, sweating;
- pounding heartbeats or fluttering in your chest;
- changes in your menstrual periods; or
- appetite changes, weight changes.
Less serious side effects may include mild hair loss.
Read the entire detailed patient monograph for Levothroid (Levothyroxine Sodium) »
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Levothroid Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these unlikely but serious effects of high thyroid hormone levels occur: increased sweating, sensitivity to heat, mental/mood changes (such as nervousness, mood swings), tiredness, diarrhea, shaking (tremor), headache, shortness of breath.
Get medical help right away if any of these rare but serious effects of high thyroid hormone levels occur: chest pain, fast/pounding/irregular heartbeat, swelling hands/ankles/feet, seizures.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Levothroid (Levothyroxine Sodium)»
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Levothroid FDA Prescribing Information: Side Effects
General: fatigue, increased appetite, weight loss, heat intolerance, fever, excessive sweating;
Musculoskeletal: tremors, muscle weakness;
Gastrointestinal: diarrhea, vomiting, abdominal cramps and elevations in liver function tests;
Dermatologic: hair loss, flushing;
Pseudotumor cerebri and slipped capital femoral epiphysis have been reported in children receiving levothyroxine therapy. Overtreatment may result in craniosynostosis in infants and premature closure of the epiphyses in children with resultant compromised adult height.
Seizures have been reported rarely with the institution of levothyroxine therapy.
Inadequate levothyroxine dosage will produce or fail to ameliorate the signs and symptoms of hypothyroidism.
Hypersensitivity reactions to inactive ingredients have occurred in patients treated with thyroid hormone products. These include urticaria, pruritus, skin rash, flushing, angioedema, various GI symptoms (abdominal pain, nausea, vomiting and diarrhea), fever, arthralgia, serum sickness and wheezing. Hypersensitivity to levothyroxine itself is not known to occur.
Read the entire FDA prescribing information for Levothroid (Levothyroxine Sodium) »
Additional Levothroid Information
Levothroid - User Reviews
Levothroid User Reviews
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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