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.
Other topics and Adverse effects
Children
Young adults with recent onset Graves' disease
Elderly patients with ischemic hea disease
Pregnant women
Elderly patients with ischemic hea disease