Mamofen 20 Tablet contains Tamoxifen 20mg, a selective estrogen receptor modulator (SERM) widely used in the treatment and prevention of estrogen receptor-positive breast cancer. Tamoxifen functions by competitively binding to estrogen receptors in breast tissue, thereby inhibiting estrogen-mediated cellular proliferation. This mechanism makes Mamofen 20 effective in reducing tumor growth and recurrence in both premenopausal and postmenopausal women. It is commonly prescribed as adjuvant therapy following surgery, radiation, or chemotherapy, as well as for metastatic breast cancer management. Additionally, Mamofen 20 is utilized for reducing the risk of breast cancer in high-risk individuals. The standard dosage and duration of treatment depend on the clinical scenario and patient response, typically ranging from 20mg once daily for several years. Common adverse effects include hot flashes, nausea, fatigue, and increased risk of thromboembolic events; therefore, patients should be monitored regularly for signs of deep vein thrombosis or pulmonary embolism. Contraindications include hypersensitivity to Tamoxifen and concurrent anticoagulant therapy without medical supervision. Mamofen 20 should be used under strict medical guidance, with periodic evaluation to balance therapeutic benefits against potential risks.