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Propylthiouracil prevents the thyroid gland from producing too much thyroid hormone.

Propylthiouracil is used to treat hyperthyroidism (overactive thyroid) or Graves' disease.

Take exactly as prescribed by your doctor. Do not take in larger or smaller amounts or for longer than recommended. Follow the directions on your prescription label.

Take this medicine with a full glass of water. Propylthiouracil can be taken with or without food.

Use propylthiouracil regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely.

Propylthiouracil can lower blood cells that help your body fight infections. This can make it easier for you to bleed from an injury or get sick from being around others who are ill. Your blood may need to be tested often. Visit your doctor regularly.

Contact your doctor at once if you develop signs of infection such as fever, chills, sore throat, flu symptoms, easy bruising or bleeding (nosebleeds, bleeding gums), loss of appetite, nausea and vomiting, mouth sores, or unusual weakness.