Methimazole tablets have some adverse effects, rashes are more common and symptoms can resemble hives. If it occurs, prompt medical treatment is recommended. Methimazole is an oral antithyroid drug that works to treat hyperthyroidism by reducing the synthesis of thyroid hormones. This product is associated with adverse reactions such as itching of the skin, rash, and toxic liver disease. Therefore, methimazole tablets may cause patients to experience symptoms similar to hives, but not the same as hives. It is contraindicated in lactating women and those who are allergic to the product. If patients experience adverse reactions such as rash, itchy skin, leukopenia, granulocyte deficiency, aplastic anemia, loss of taste, nausea, vomiting, epigastric discomfort, arthralgia, dizziness and headache, vasculitis, hepatitis, interstitial pneumonitis, nephritis and other adverse reactions, the medication should be discontinued immediately and medical attention should be sought. Your doctor will consider changing your medication and treating the adverse reactions. The use of this prescription drug must follow the doctor’s instructions, not blindly use the drug by yourself, so as not to cause adverse consequences.