Side Effects

Drug information provided by: Micromedex

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur:

After treatment of overactive thyroid

Symptoms of an underactive thyroid
  1. Changes in menstrual periods
  2. clumsiness
  3. coldness
  4. drowsiness
  5. dry, puffy skin
  6. headache
  7. listlessness
  8. muscle aches
  9. thinning of the hair (temporary)
  10. unusual tiredness or weakness
  11. weight gain

Rare

After treatment of overactive thyroid
  1. Excessive sweating
  2. fast, irregular, pounding, or racing heartbeat or pulse
  3. fever
  4. unusual irritability
After treatment of cancer of the thyroid
  1. Black, tarry stools
  2. blood in the urine or stools
  3. cough or hoarseness
  4. fever or chills
  5. lower back or side pain
  6. painful or difficult swallowing
  7. painful or difficult urination
  8. pinpoint red spots on the skin
  9. unusual bleeding or bruising

Incidence not known

After treatment of overactive thyroid
  1. Chest pain
  2. fast, pounding, or irregular heartbeat or pulse
  3. hives, itching, and rash
  4. nervousness
  5. sensitivity to heat
  6. sweating
  7. tenderness of salivary glands
  8. trouble sleeping
  9. weight loss
After treatment of cancer of the thyroid
  1. Abdominal or stomach cramps
  2. bleeding gums
  3. bone pain
  4. diarrhea
  5. feeling of discomfort
  6. loss of appetite
  7. nausea
  8. sore throat
  9. unusual tiredness or weakness
  10. vomiting
  11. weakness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

After treatment of overactive thyroid or cancer of the thyroid
  1. Neck tenderness or swelling
  2. sore throat
After treatment of cancer of the thyroid
  1. Loss of taste (temporary)
  2. nausea and vomiting (temporary)
  3. tenderness of the salivary glands

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.