Tamoxifen citrate 20 is a nonsteroidal agent that has demonstrated potent antiestrogenic
effects related to its ability to compete with estrogen for binding sites in target tissues.
Tamoxifen citrate is an oral anti- estrogen and estrogen antagonist which competes with
estrogen at the receptor sites reducing estrogenic expression. Tamoxifen citrate is a
Selective Estrogen Receptor Modular (SERM) acting via estrogen site competition as
opposed to Aromatase Inhibitor (Al) drugs which prevent aromatase derived estrogens from
being created.