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<h3>Overview</h3>
<p>Letermovir is a <strong>cytomegalovirus (CMV) terminase inhibitor</strong> used primarily in prophylaxis. Its molecular formula is C<sub>28</sub>H<sub>31</sub>N<sub>5</sub>O<sub>4</sub> with CAS No. 1062793-83-2.</p>
<h3>Application</h3>
<ul>
<li><strong>Hematopoietic Stem Cell Transplantation (HSCT)</strong>: Prophylaxis against CMV infection in adult recipients.</li>
<li><strong>Viral Inhibition</strong>: Targets the viral DNA packaging process to prevent replication.</li>
</ul>
<h3>Precautions</h3>
<p>Contraindicated in patients with severe hepatic impairment. Requires strict storage at controlled room temperature and avoidance of concomitant use with cyclosporine due to significant drug-drug interactions affecting exposure levels.</p>