TPO and thyrotoxicosis: In addition to beta-blockers, thioamides were used to block the action of thyroid peroxidase, an enzyme required for the synthesis of T3 and T4.[15] In addition a glucocorticoid was used to inhibit the conversion of T4 to T3,[16] and Lugol solution was administered to reduce thyroid iodine uptake, iodine oxidation, and organification.[17] Although some reports reported that thyroidectomy was performed for complete resolution of thyrotoxicosis,[18,19] in this case, the patient’s family did not want surgical treatment, so only medical treatment was maintained.