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<h3>Overview</h3>
<p>Ondansetron is a selective 5-HT3 receptor antagonist used primarily in oncology and surgery. The core synthesis involves complex heterocyclic coupling. <strong>Molecular Formula</strong>: C18H19N3O; <strong>CAS No.</strong>: 66127-93-7.</p>
<h3>Application</h3>
<ul>
<li><strong>Oncology:</strong> Prophylaxis of chemotherapy-induced nausea and vomiting (CINV).</li>
<li><strong>Surgery:</strong> Management of postoperative nausea and vomiting (PONV).</li>
<li><strong>Radiation Therapy:</strong> Prevention of radiation sickness symptoms.</li>
</ul>
<h3>Precautions</h3>
<p>Contraindicated with apomorphine due to hypotension risk. Strictly store below 25°C in dry, light-resistant containers. Monitor for QT interval prolongation in patients with cardiac history.</p>