ARIMIDEX does not do the job in Females with breast most cancers which have not gone through menopause (premenopausal women).tamoxifen. You should not consider ARIMIDEX if you are taking tamoxifen. Getting ARIMIDEX with tamoxifen may perhaps lessen the level of ARIMIDEX in the blood and could induce ARIMIDEX not to work at the same time.For those w