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Viagra can minimize blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking Viagra, most of whom also had cardiovascular disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old. It is not clear whether Viagra really cause of vision loss.
Stop using Viagra and get emergency medical attention if you have sudden vision loss.
Do not take this drug if you are also using a nitrate drug for chest pain or heart problems. This includes isosorbide dinitrate, nitroglycerin, and isosorbide mononitrate. Nitrates are also found in some recreational medications such as amyl nitrate or nitrite. Taking Viagra with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke, or cardiovascular attack. This drug belongs to FDA category B that indicates that this drug is not expected to cause harmful effects to unborn baby. Do not use Viagra without telling your doctor if you are pregnant or plan to become pregnant during entire treatment. It is not known if Viagra passes into breast milk or if it could give potential danger of a nursing baby. Do not use this medication without telling your physician if you are breast-feeding a baby.
Take Viagra exactly as it was indicated for you. Do not take it in larger doses or for longer than recommended by your physician. Follow the instructions on your prescription label that comes along with the drug.
This drug is usually taken only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual act. Do not take Viagra more than one tablet a day.
Viagra can facilitate you have an erection when sexual stimulation occurs.