Propylthiouracil is a classic thiopyrimidine antithyroid pharmaceutical compound with important clinical and pharmacological research value. It effectively inhibits thyroid hormone synthesis by blocking iodination and coupling reactions of tyrosine in the thyroid gland, and also reduces peripheral conversion of thyroxine to triiodothyronine. Clinically, it is widely used for the treatment of hyperthyroidism, Graves’ disease, thyroid crisis and preoperative preparation for thyroidectomy. In pharmaceutical research, it acts as a reference standard substance for quality control of antithyroid drugs and serves as a lead compound for structural modification of thiouracil derivatives. It is also commonly applied in establishing animal hyperthyroidism models, exploring thyroid endocrine regulation mechanisms, and screening new endocrine therapeutic agents in biochemical and pharmacological laboratories. As a core raw material and standard reagent in endocrinology research, it occupies an essential position in pharmaceutical raw material production and medical experimental research.

Propylthiouracil is a bioactive medicinal compound with certain systemic toxicity and irritancy, requiring standardized protection during handling and storage. Inhalation of fine crystalline dust may irritate the respiratory mucosa, causing sore throat, mild cough and chest discomfort, especially in poorly ventilated environments. Direct skin contact may trigger local redness, itching and mild allergic reactions; prolonged exposure may lead to skin dryness and dermatitis in sensitive populations. Eye contact can cause conjunctival congestion, burning sensation and tearing, and immediate flushing with plenty of clean water is required upon accidental exposure. Accidental ingestion may interfere with normal thyroid function and induce gastrointestinal discomfort such as nausea, abdominal pain and loss of appetite, while excessive intake may affect blood cell levels and liver metabolism. All operations should be carried out in a well-ventilated fume hood; operators need to wear chemical-resistant gloves, safety goggles and dust masks to avoid inhalation and direct body contact. Keep the container tightly sealed, stored away from light and high temperature, and isolated from strong oxidants. Waste residues and contaminated packaging must be disposed of in accordance with hazardous waste management regulations to prevent environmental contamination and unintended endocrine interference risks.