There are two main types of antithyroid drugs, methimazole (Sage) and propylthiouracil (PTU). Some people taking antithyroid drugs may experience allergic reactions such as impaired liver function, leukopenia, vasculitis and skin rash. Therefore, it is important to review liver function and blood tests regularly during the course of medication. If recurrent fever and sore throat, yellowing of the skin, aversion to oil, joint pain, abdominal pain and rash occur, you should visit a hospital promptly to clarify whether they are caused by side effects of the medication.