Hexestrol is a synthetic, non-steroidal estrogen that was previously used in various medical treatments, including hormone replacement therapy and the treatment of certain types of cancer. It is no longer commonly used in clinical medicine due to its associated side effects and the availability of safer and more effective alternatives. Hexestrol is classified as a carcinogen and may increase the risk of certain cancers, particularly endometrial and breast cancer. It is important to note that the use of hexestrol and other synthetic estrogens should be under the supervision of a healthcare professional, and it is not recommended for self-medication.