Antiestrogen

**Semantic type:** Chemical Viewed Functionally

**Definition:** Substances that inhibit or antagonize the biosynthesis or biologic effects of estrogens by either antagonizing the responsiveness of estrogen sensitive tissues or competing with their binding sites.

**Synonyms:** - Anti-Estrogens - Antiestrogen Therapy - Antiestrogen Therapy Agent - Antiestrogenic - Antiestrogens - Estrogen Antagonist - Estrogen Inhibitor - antiestrogen - estrogen blocker