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Levothyroxine (also called Synthroid®) is a thyroid hormone used to treat hypothyroidism. Hypothyroidism occurs when the thyroid gland does not produce enough thyroid hormone.
Levothyroxine is available as tablets of several different strengths. All are taken by mouth. Below is a list of the tablet strengths and their colors:
Levothyroxine is also available as a clear liquid given by vein (IV).
Although side effects from levothyroxine are not common, they can occur. Most of these side effects reflect a response to the thyroid replacement. Either the dose of medicine is not enough or is too high. Always tell your doctor if you have any of these side effects:
These are the most common side effects, but there may be others. Please report all side effects to the doctor or nurse.
Symptoms of an allergic reaction include: rash, hives, itching, chills, fever, headache, muscle ache, shortness of breath, coughing, tightness in the throat, swelling of the face or neck.
Not all patients who take levothyroxine will experience these side effects. Common side effects are bolded, but there may be others. Please report all suspected side effects to your doctor or pharmacist.
Find more information on side effects.
Be sure to discuss all questions and instructions with your doctor or pharmacist.