Abstract
Although estrogens have proved useful in the prevention and treatment of osteoporosis, their side effects (for example, those on breast and endometrial cancer) are worrying to patients and physicians alike. Therefore, selective estrogen receptor modulator (SERM) drugs have been developed for use in their stead. The triphenylethylene drug tamoxifen proved to be protective against bone loss, but had side effects on uterus similar to those of natural estrogens. The tamoxifen derivative toremifene has less effect on bone. Further derivatives of tamoxifen (droloxifene, idoxifene) can be expected to act like tamoxifen when approved for clinical testing. The non-steroidal benzothiophene derivative, raloxifene, is the best SERM available thus far. It does not increase the incidence of endo-metrial cancer; in addition, like tamoxifen, it has the potential to prevent breast cancer, but has a better profile in its actions on bone (for example, it reduces the vertebral fracture rate more effectively than tamoxifen). Unlike estrogen, it decreases blood triglicerides as well as cholesterol.
Published Version
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