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Viagra Oral Medication Interactions


IMPORTANT NOTE: The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate or effective for you. Consult your healthcare professional before using this drug.

Table of Contents

Generic Name: SILDENAFIL - ORAL
Pronounced: (sil-DEN-a-fil)

Viagra Oral 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).


CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.
Information last revised December 2010 Copyright(c) 2010 First DataBank, Inc.