selective estrogen receptor modulator (SERM)

A selective estrogen receptor modulator (SERM) is a type of medication that can either block or activate estrogen receptors in various tissues of the body. This means it can mimic estrogen's effects in some areas, like bones, to help prevent osteoporosis, while blocking effects in others, such as breast tissue, to reduce the risk of cancer. SERMs are used to treat or prevent conditions influenced by estrogen, such as certain breast cancers and menopausal symptoms, by selectively modulating estrogen's activity depending on the tissue involved.