Propylthiouracil (PTU): uses, side effects & brands
Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
PTU treats overactive thyroid and is preferred in early pregnancy. It belongs to the Thyroid & hormone medicine group. These treat an overactive thyroid and some hormone-related conditions.
Report a sore throat or fever promptly (blood-count effect)
Thyroid levels are monitored regularly
Dose changes with pregnancy
When to see a doctor urgently
Sore throat, mouth ulcers or fever (possible low white cells — urgent blood test)
Yellow eyes or dark urine (liver)
Severe rash
Not a prescription — no dose shown. The right dose of propylthiouracil depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.
Frequently asked questions
How long are antithyroid medicines taken?
Often 12–18 months or longer, with regular thyroid tests. Some people need surgery or radioiodine for a lasting solution.
Why report a sore throat on these medicines?
Rarely they lower infection-fighting white cells, so a sore throat or fever needs a prompt blood check.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.