Propylthiouracil is used to treat an overactive thyroid gland (hyperthyroidism). When the thyroid gland is overactive it makes too much of a hormone called thyroxine. The extra thyroxine causes many of the body's functions to speed up. This can lead to symptoms such as losing weight, excessive sweating, feeling irritable or shaky, and diarrhoea. You also may feel tired or worried, and women may develop menstrual problems.
This is a companion discussion topic for the original article at https://patient.info/medicine/propylthiouracil-tablets