Tamoxifen is a drug that interferes with estrogen. It is a SERM (Selective Estrogen-Receptor Modulator) and it binds to the estrogen receptors in the breast cancer cells so that the cancer cells can't use estrogen to grow.
Tamoxifen has been used for over 30 years to treat breast cancer and for over 10 years to reduce the risk of breast cancer. It is usually taken for 5 years. I will switch to an aromatase inhibitor drug once my ovaries have been removed.
Side effects of Tamoxifen haven't been too bad so far. I have noticed an increase in hot flashes and occasional leg cramps but that's about it...so far.
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