Tiopronin is a medication primarily used to treat conditions related to excess copper in the body, such as Wilson's disease. It works by binding to copper, allowing it to be excreted through urine, thereby reducing its levels in the body. In addition to its use in Wilson's disease, tiopronin may also be prescribed for certain types of kidney stones. It helps prevent the formation of stones by altering the chemical composition of urine. Patients taking tiopronin should be monitored for potential side effects, including gastrointestinal issues and allergic reactions.