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With just one treatment, isotretinoin can permanently clear the skin. One treatment typically lasts 4 to 5 months. If a dermatologist prescribes a lower dose of isotretinoin, the treatment may last longer. About 85% of patients see permanent clearing after one treatment.
Most thyroid pills have a half life of 6.7 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.