A 70 year old man has diabetes, cardiopathy and Parkinson ́s disease and has been treated with enalapril, metformin, aspirin, amiodarone, and levodopa. Due to symptoms of malaise, cognitive impairment, and depression, he seeks the advice of a family physician. Blood tests revealed his TSH levels were over 40 mU/mL. At this point, medical management of this patient should include the withdrawal of a medication the patient has been taking, a blood test for an antibody and the prescription of a new drug. The drug that should be withdrawn, the antibody that he should be tested for and the new drug that should be prescribed are, respectively: