<ul>
	<li>Drugs metabolized by CYP1A2: monitor for increased serum levels of theophylline and adjust dose accordingly</li>
	<li>Methadone: monitor for signs and symptoms of methadone toxicity</li>
	<li>Nucleoside analogues: closely monitor for toxicities and dose reduce or discontinue Peginterferon alfa 2a/ Ribavirin or both should event worsen</li>
	<li>Zidovudine: monitor for worsening neutropenia and/or anemia with peginterferon alfa/rifavirin</li>
	<li>Azathioprine.</li>
</ul>