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Brand names: Viagra, Revatio

Generic names: Sildenafil citrate

Viagra (sildenafil) can be recommended for patients who have trouble getting an erection when having sex. This condition may be caused by both physical and psychological factors and is treatable in all people. Sildenafil is not expected to work unless some sexual stimulation occurs. You are not supposed to take Viagra more often than once every 24 hours, but in case of having any particular medical conditions you may be advised by your health care provider to take it even less often to make sure your condition is stable and no serious side effects occur. Drinking alcohol is not recommended as it can have an impact on the effects of Viagra. The same is with fatty meals – these can decrease the efficiency of Viagra and you may not achieve the result desired. Depending on the severity of your condition your dosage may be changed if your doctor considers it necessary.

Taking certain drugs may be a contraindication and you will not be able to use Viagra. These medicines include nitrate drugs, such as isosorbide dinitrate, isosorbide mononitrate and nitroglycerin that come in the form of usual or sublingual tablets, patches, sprays and ointments, as well as street drugs (amyl nitrate and butyl nitrate) as this may cause a sudden drop in blood pressure. There are other medicines you are not supposed to take before discussing it with your health care provider. These include alpha blockers (alfuzosin, doxazosin, tamsulosin), barbiturates, blood thinners (warfarin), beta blockers (atenolol, propranolol, metoprolol), antifungals (ketoconazole), HIV protease inhibitors, seizure medications (carbamazepine, phenytoin, phenobarbital), high blood pressure meds, or any other medications intended for the treatment of erectile dysfunction, as well as rifabutin, rifampin erythromycin, bosentan, cimetidine or efavirenz.