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Brand names: Viagra, Revatio

Generic names: Sildenafil citrate

Viagra (sildenafil) is a relatively safe medication that can be used to treat male impotence. This drug is supposed to be taken on the when-needed basis and will not be efficient if you do not take it. Viagra should be taken about an hour before you are planning to have sex and will provide for up to 4 hours of efficiency. You can get an erection within this period of time, although the effects of this medicine may get weaker as the time passes, so it’s best to enjoy it right after it becomes effective. Make sure you tell your health care provider if you are currently taking any of the following medicines: high blood pressure medications, nevirapine, phenobarbital, rifabutin, beta blockers, phenytoin, HIV protease inhibitors, erythromycin, efavirenz, barbiturates, amlodipine, other erectile dysfunction treatment drugs, bosentan, anticoagulants, cimetidine, antifungals (itraconazole, ketoconazole), medcines for seizures, tamsulosin, alpha blockers (doxazosin, prazosin, rifampin, alfuzosin) or carbamazepine. This is important as additional tests may be required to make sure Viagra will work fine for you and is unlikely to cause rare and dangerous side effects. Do not start taking this medicine if you are currently taking a nitrate-based drug of any form – tablets, ointments, pastes, patches, regular or sublingual tablets etc. Make sure at least two weeks pass after your last dosage of isosorbide dinitrate, isosorbide mononitrate or nitroglycerin to make sure you can take Viagra safely.