Many posts reveal a lack of understanding re tamoxfen. Tamoxifen does not lower estrogen levels. Tamoxifen fits into a receptor site on your breast estrogen that cancer must use in order to feed on the estrogen. Thus the cancer may literally starve because it can not access your estrogen. Tamoxifen has side effects that can be estrogen enhancing (such as bone strengthening) or estrogen lowering (such as hot flashes). It is a very powerful tool in fighting ER+ tumors. See this link for more info: http://www.breastcancer.org/treatment/hormonal/serms/
