Stilboestrol is a synthetic hormone that was commonly used for menopausal hormone therapy until the 1970s when it was linked to an increased risk of cancer. It was also used to treat osteoporosis and prostate cancer. However, due to its risks, stilboestrol is no longer recommended, and more modern medications have replaced it. Some synonyms that are often used to refer to stilboestrol include diethylstilbestrol (DES), stilbestrol, and DES-ex. These synonyms are often used interchangeably, but it is essential to note that they all refer to the same medication with the same potential risks and benefits. It is always essential to consult with a healthcare provider before starting any medication.