What does ptu (propylthiouracil) means and the side effects?

Propylthiouracil: Ptu (propylthiouracil) is used to treat hyperthyroidism. It is very effective to cool down the hyperthyroidism. Although it is generally well tolerated, it can cause a rash. More serious side effects are low white blood cell count, making you prone to infections, and liver injury. Another drug, methimazole, has less liver toxicity, and is usually preferred over ptu.