Quinine is used alone or with other medications to treat malaria (a serious or life-threatening illness that is spread by mosquitos in certain parts of the world). Quinine should not be used to prevent malaria or to prev...

Propylthiouracil is used to treat hyperthyroidism, a condition that occurs when the thyroid gland produces too much thyroid hormone. It also is taken before thyroid surgery or radioactive iodine therapy.