Methimazole in Graves' Disease - Comparing the Computer-aided Treatment DigiThy Versus Usual Care

Inclusion Criteria: * Active Graves' hyperthyroidism \[Thyroid-stimulating hormone \<0.1 mU/L, elevated free thyroxine levels (fT4) above the upper limit of normal and positive Thyrotropin receptor antibody (TRAb) according to local laboratory results\], measured within the last month prior to the inclusion date * Patients not yet receiving antithyroid treatment, or having received antithyroid treatment continuously for less than 4 weeks, or relapse or recurrence of Graves' hyperthyroidism defined as patients previously having received and discontinued treatment with antithyroid drugs for at least 4 weeks) * Age 18 years or older * Provision of written informed consent Exclusion Criteria: * Previous treatment with radioactive iodine * Ongoing antithyroid treatment for more than one month * Pregnancy * Treatment with propylthiouracil