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Viagra is a popular oral medication that helps men suffering from erectile dysfunction (inability to get or keep an erection for a long time) to have a successful sexual intercourse. Viagra is available by a prescription and comes in diamond-shaped blue tablets of 25 mg, 50 mg, and 100 mg. In case you have chest problems and are currently taking any nitrate drugs, such as nitroglycerin (Nitrostat, Nitrolingual, Nitro-Bid), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), or isosorbide mononitrate (Imdur, ISMO, Monoket) Viagra is not recommended as serious side effects may occur. Simultaneous use of Viagra and nitrates may cause a sudden drop in blood pressure, leading to a stroke or a heart attack.

Very rare but serious side effects have been reported in some patients taking Viagra. Priapism is an erection that lasts longer than 4 hours and is usually painful. This side effect may lead to a permanent damage of the penis, which is why it is recommended to seek immediate medical help. Another side effect is sudden vision loss. While it’s not clear whether there is a direct connection between taking Viagra and the decrease of blood flow to the optic nerve, in case of experiencing the symptoms mentioned above seek medical help.