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<h3>Overview</h3>
<p>Tamoxifen is a non-steroidal selective estrogen receptor modulator (SERM) primarily synthesized via condensation of 1-(4-chlorophenyl)-1,2-diphenylethylene with dimethylaminoethanol. Its molecular formula is <strong>C<sub>26</sub>H<sub>29</sub>NO</strong>, and the CAS registry number is <strong>10540-29-1</strong>.</p>
<h3>Application</h3>
<ul>
<li><strong>Oncology:</strong> First-line treatment for hormone receptor-positive breast cancer in pre- and post-menopausal women.</li>
<li><strong>Fertility:</strong> Off-label use to induce ovulation in patients with anovulatory infertility.</li>
<li><strong>Risk Reduction:</strong> Prophylactic therapy for high-risk individuals to prevent invasive breast cancer development.</li>
</ul>
<h3>Precautions</h3>
<p>Strictly contraindicated during pregnancy due to teratogenic risks. Requires storage in cool, dry conditions below 25°C to maintain stability against hydrolysis. Clinical monitoring for thromboembolic events and endometrial changes is mandatory.</p>