Tamoxifen Citrate (brand name Nolvadex) is another Selective Estrogen Receptor Modulator (SERM) that is often used as an anti-estrogen and post cuycle theraphy drug by anabolic steroid users.
The Selective aspect of the name of this class of drug is just that: they act on certain parts of the body only and as we will see, Nolvadex is very selective in its targeting of the breast tissue, making it valuable both medically and for steroids users concerned about certain side effects.