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Since Euthyrox or Synthroid (and most other thyroid pills) behave exactly as normal human thyroid hormone, they are not rapidly cleared from the body as other medications are. Most thyroid pills have a half life of days which means they must be stopped for four to five weeks (five half lives) before accurate thyroid testing is possible. An exception to the long half life of thyroid medication is Cytomel - a thyroid pill with a half life of only forty-eight hours. Therefore it is possible to change a person's thyroid replacement to Cytomel for one month to allow time for his regular pills to clear the body. Cytomel is then stopped for ten days (five half lives) and the appropriate test can then be done. Usually patients, even those who have no remaining thyroid function, tolerate being off thyroid replacement only ten days quite well.