The most often used methods to castrate a man are surgical and chemical methods. The surgical method is performed under medically supervised conditions. It involves the removal of both testes and is irreversible. Castration is also called neutering.
Castration can also be done chemically with the use of drugs such as cyproterone, degarelix and bicalutamide. This method is painless as it involves the administration of drugs. These drugs stop the release of the sex hormone testosterone. Men lose their fertility and sex drive, but the testes are not removed.
Castration is used in some countries as a form of punishment for pedophiles and other sex offenders. Castration is also performed to mitigate the symptoms of prostate cancer.