You have been placed on a drug (Tapazole, methimazole, or propylthiouracil) for the treatment of an overactive thyroid gland. This drug works well but uncommonly can have serious side effects. One of these side effects is to block the production of blood cells that help fight infections. Most people who experience this side effect have either:

  • a sore throat
  • a fever, or
  • some kind of infection; or
  • just begin to feel increasingly ill

If you should develop any of these symptoms while on any of the above medications, it is important that you:


Stop the medication and call Dr. Tobey so that you can come in and have a blood count done as soon as possible.  The medication should not be restarted until after talking with the doctor.


Revised 9/08




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