# antiestrogen --- **antiestrogen** are a type of [[medicine]] that Tamoxifen (Novodex) Hormonal Agent: antiestrogen for estrogen sensitive tumors Compete with estrogen by binding to the receptor sites Estrogen Antagonist — blocking estrogen in tumors preventing tumor growth Estrogen Agonist (estrogen-like) — Positive effects on lipid levels and bone mineral densities Indications: treat disease: reduces tumor recurrence and prolongs life Primary prevention in high risk women Increases risk for endometrial cancer and thrombosis Safety: Safe patient handling ## Mechanism of Action ## Contraindications ## Adverse Reactions ## Examples ___