Tamoxifen (Nolvadex) 20 mg is an oral medication containing 20 mg of tamoxifen citrate per tablet. Tamoxifen is classified as a Selective Estrogen Receptor Modulator (SERM) and is widely used in clinical settings for hormone-related conditions.
Active Ingredient
Tamoxifen Citrate works by selectively binding to estrogen receptors. Depending on the target tissue, it may block or partially activate estrogenic activity. In breast tissue, it primarily acts as an estrogen receptor antagonist.
Composition
Each tablet typically contains:
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Tamoxifen Citrate (equivalent to 20 mg tamoxifen)
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Pharmaceutical excipients such as fillers, binders, and coating agents
Inactive ingredients vary by manufacturer.
Mechanism of Action
Tamoxifen binds to estrogen receptors and blocks estrogen from stimulating certain tissues, particularly breast tissue. In other tissues, such as bone or the uterus, it may exert partial estrogen-like effects.
Medical Uses
Tamoxifen is commonly prescribed for the treatment and prevention of estrogen receptor–positive (ER+) breast cancer. It may also be used in certain cases to reduce the risk of breast cancer in high-risk individuals. Treatment is typically guided and monitored by a qualified healthcare professional.
Pharmacological Characteristics
Tamoxifen is well absorbed after oral administration and is metabolized in the liver into active metabolites. It has a relatively long half-life, contributing to sustained therapeutic effects.




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