Gentian violet 1percent is a good over-the-counter medication for thrush according to WebMD. Other medications can be prescribed by a doctor.
The medications used are designed to halt the growth of yeast in the body. The exact medication used depends on the location of the thrush. If the thrush affects a small portion of the body, topical medications can be applied directly to the area. However, if the thrush is widespread, oral medication is needed. In severe cases, the medication can be administered intravenously. A person suffering from thrush should talk to their doctor to determine the medication that works best.