sildenafil - oral, Viagra (cont.)

DRUG INTERACTIONS: See also How to Use section.Drug interactions may change how your medications 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 pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.Some products that may interact with this drug include: certain recreational drugs ("poppers") containing amyl/butyl nitrite, alpha blocker medication (such as doxazosin, prazosin, terazosin), bosentan.Other medications can affect the removal of sildenafil from your body, which may affect how sildenafil works. Examples include cimetidine, anticonvulsants (such as carbamazepine, phenobarbital, phenytoin), azole antifungals (such as ketoconazole, itraconazole), macrolide antibiotics (such as erythromycin), rifamycins (such as rifabutin), HIV drugs (such as ritonavir, saquinavir, delavirdine), St. John's wort, among others.Sildenafil may interact with certain chest pain medications (nitrates such as nitroglycerin, isosorbide) causing a dangerous drop in blood pressure. Do not take sildenafil if you also use nitrates. Talk with your doctor or pharmacist for more details and for information on what to do if you get unusual chest pain.Do not take this medication with any other product that contains sildenafil or other similar medications for erection problems/pulmonary hypertension (such as tadalafil, vardenafil).

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