1. 99% of the radioactivity in your body will be excreted within one month. Since I-131 is volatile, please flush the toilet at least 2 times after urination and defecation to avoid contaminating the environment. 2. For patients with acute exacerbation of hyperthyroidism, such as high fever, profuse sweating, vomiting, and blurred consciousness, hyperthyroidism should be considered as a critical condition and immediate emergency treatment should be sought. 3. Before treatment, physicians will prescribe medication to counteract rapid heart rate, which should be continued after treatment until the medication is discontinued by medical advice. 4. After treatment, monthly rechecking of nail function is required. 5. The degree of recovery of nail function after hyperthyroidism treatment varies greatly among individuals and usually takes as long as six months to review. 6. It is important to keep in touch with your physician for specific analysis of your condition.