TAMOXIFEN CITRATE 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 (AI) drugs which prevent
aromatase derived estrogens from being created.