Tamoxifen normally sold under the brand name Nolvadex is a selective estrogen receptor modulator that is used to treat and prevent breast cancer in women and men. It is used as an ancillary drug in the anabolic steroid cycle. An ancillary drug is used to prevent or suppress the undesired outcomes of anabolic steroids. Tamoxifen binds to estrogen receptors and lacks aromatization characteristics. You can take tamoxifen together with anabolic steroids in the dosage of 10mg to 40mg per day.