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  • Basic Info
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Generic: levothyroxine
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This medicine can improve symptoms of thyroid deficiency such as slow speech, lack of energy, weight gain, hair loss, dry skin, and feeling cold
               



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What may interact with this medicine?

  • amiodarone
  • antacids
  • anti- thyroid medicines
  • calcium supplements
  • carbamazepine
  • cholestyramine
  • colestipol
  • digoxin
  • female hormones, including contraceptive or birth control pills
  • iron supplements
  • ketamine
  • liquid nutrition products like Ensure
  • medicines for colds and breathing difficulties
  • medicines for diabetes
  • medicines for mental depression
  • medicines or herbals used to decrease weight or appetite
  • phenobarbital or other barbiturate medications
  • phenytoin
  • prednisone or other corticosteroids
  • rifabutin
  • rifampin
  • soy isoflavones
  • sucralfate
  • theophylline
  • warfarin

What should I watch for while using this medicine?

Be sure to take this medicine with plenty of fluids. Some tablets may cause choking, gagging, or difficulty swallowing from the tablet getting stuck in your throat. Most of these problems disappear if the medicine is taken with the right amount of water or other fluids.

Do not switch brands of this medicine unless your health care professional agrees with the change. Ask questions if you are uncertain.

You will need regular exams and occasional blood tests to check the response to treatment. If you are receiving this medicine for an underactive thyroid, it may be several weeks before you notice an improvement. Check with your doctor or health care professional if your symptoms do not improve.

It may be necessary for you to take this medicine for the rest of your life. Do not stop using this medicine unless your doctor or health care professional advises you to.

This medicine can affect blood sugar levels. If you have diabetes, check your blood sugar as directed.

You may lose some of your hair when you first start treatment. With time, this usually corrects itself.

If you are going to have surgery, tell your doctor or health care professional that you are taking this medicine.

What side effects may I notice from receiving this medicine?

Side effects that you should report to your doctor or health care professional as soon as possible:
  • allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
  • chest pain
  • excessive sweating or intolerance to heat
  • fast or irregular heartbeat
  • nervousness
  • skin rash or hives
  • swelling of ankles, feet, or legs
  • tremors

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

  • changes in appetite
  • changes in menstrual periods
  • diarrhea
  • hair loss
  • headache
  • trouble sleeping
  • weight loss

               
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