I131 is the preferred treatment for:
(Ref: KDT 6/e p253) I131 is contra-indicated in children and young adults because if hypothyroidism develops in response to radioactive iodine, it is permanent. Use of radioactive iodine is contra-indicated in pregnancy. In ischemic hea disease patients, surgery should be avoided. I131 therapy is a good alternative in such patients.
Children
Young adults with recent onset Graves' disease
Elderly patients with ischemic hea disease
Pregnant women
Other topics and Adverse effects