Quite right- tamoxifen is a chemical which blocks the action of natural oestrogens (UK spelling) . So it interferes with the signals that tell the cells to grow- so they don't! That's good. It only works for people who have cells that are oestrogen positive. (respond to oestrogen).
I am on tamoxifen and it does have side effects as it has helped to keep me in a kind of menopause. I have hot flashes, leg cramps and I think my memory is not as good (but I can't really remember). I am also very moody.
All in all I think it is fairly well tolerated but can increase risks of thrombosis (blood clots). That's only a problem for few women though and your doctor will know.
I don't have any major problems with taking it but I am taking so many other things it's hard to attribute side effects to any one thing.
I am not worried about taking tamoxifen at all. Hope this helps. I am not a Doctor but I am a biochemist.
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