Tamoxifen is a Selective Estrogen Receptor Modulator (SERM) used to treat and prevent hormone-receptor-positive breast cancer by blocking estrogen from binding to cancer cells. It is approved for reducing recurrence in early-stage breast cancer and for risk reduction in high-risk patients, typically taken daily for 5 to 10 years, according to Wikipedia. While effective, it may cause menopausal-like side effects and poses rare risks of uterine cancer or blood clots. For more detailed information, visit the Wikipedia page on Tamoxifen.
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