It binds itself to the estrogen receptor, thus, blocking the effects of estrogen. This drug has been in use for clinical purposes such as treating breast cancer patients and reducing its probability in high-risk patients. Nevertheless, this drug became more popular amongst bodybuilders and athletes for using this drug as a post cycle therapy drug. Many bodybuilders take tamoxifen to treat and avoid any side effect caused through anabolic steroids. It became one of the most effective post cycle therapy medication to restore the natural hormone production. It is known to have treated side effects such as gynecomastia, water retention and etc. All the other effects of this drug are secondary to the blockage of estrogen receptors.