<p>Drug interactions&nbsp;may change how your&nbsp;medications&nbsp;work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and&nbsp;pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor&#39;s approval.</p>

<p>Some products need&nbsp;stomach&nbsp;acid so that the body can absorb them properly.&nbsp;Famotidine&nbsp;decreases&nbsp;stomach&nbsp;acid, so it may change how well these products work. Some affected products include&nbsp;atazanavir,&nbsp;dasatinib,&nbsp;delavirdine, certain azole antifungals (such as&nbsp;itraconazole,&nbsp;ketoconazole), levoketoconazole, pazopanib, among others.</p>

<p>Do not take this&nbsp;medication&nbsp;with other products that contain famotidine or other H2 blockers (cimetidine, nizatidine,&nbsp;ranitidine).</p>