One kind of hyperthyroidism drug is radioactive iodine-131, which is a radioactive element and has a certain degree of radiation. There are still certain requirements for patients taking Iodine-131 treatment: First, patients taking Iodine-131 treatment should not be in close contact with children, because although the radiation is relatively small, it can still affect the development of children, so they should never be in close contact. The second point is that within one month of taking iodine-131 treatment, it is important to keep a distance of more than one meter from adults in general, also to prevent damage caused by low amounts of radiation. The third point is that because the radioactive iodine drug after taking iodine-131 treatment may be excreted through the urinary tract or gastrointestinal tract, patients should clean up their excrement and not let the radioactive elements contaminate the surrounding environment.