Patients will receive p.o. methimazole (Thacapzol) 5 mg 3x2 supplemented with L-thyroxine (Euthyrox) after 14 days, initially for the first two weeks 0.5x1, and thereafter 1x1. If the patient react with allergic symptoms to methimazole, treatment is changed to propylthiouracil (Tiotil) 50 mg 3x3. Adjustment of L-thyroxine is done with help of thyroid laboratory parameters (TSH, fT4) and titration after clinical response. The dose of thyrostatics is not reduced and if necessary on demand the dose is increased. If necessary, a beta-blocker is used, primarily propranolol (Inderal) 40 mg 1x1-3 or metoprolol (Seloken) 50 mg 1x1-3 which can be increased depending of patients response.