Side effects of propylthiouracil tablets include headache, dizziness, arthralgia, skin rash, etc. Patients are advised to follow the doctor’s instructions. Propylthiouracil tablets belong to the antithyroid drugs, clinically commonly used in the treatment of hyperthyroidism. Some patients may experience side effects such as headache, dizziness, arthralgia, rash, and swollen lymph nodes after taking propylthiouracil tablets. Some patients also experience gastrointestinal reactions such as nausea and vomiting after using the drug. Very few patients develop side effects such as jaundice and toxic hepatitis after using the drug. The instruction of propylthiouracil tablets indicates that the most serious side effect is granulocyte deficiency, so patients need to check their blood regularly during the use of the drug. Prothiouracil tablets are contraindicated for people with severe hepatic impairment, severe leukocyte deficiency and allergy to thiourea drugs. At the same time, pregnant women, low peripheral blood leukocytes, abnormal liver function should be used with caution, while lactating women are prohibited. Patients are advised to take propylthiouracil tablets according to the doctor’s instructions, and not to use the drug or adjust the dosage on their own.