- Viagra relaxes muscles and increases blood flow to particular areas of the body.

- Viagra under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of viagra is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women.

- Viagra may also be used for purposes other than those listed here.

What should I discuss with my doctor before taking viagra?

- Do not take viagra if you are also using a nitrate drug for chest pain or heart problems. This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking viagra with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke, or heart attack.

- A small number of patients have had a sudden loss of eyesight after taking viagra. This type of vision loss is caused by decreased blood flow to the optic nerve of the eye. It is not clear whether viagra is the actual cause of such vision loss. Sudden vision loss with viagra use has occurred most often in people with heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old.

- If you have any of these conditions, you may not be able to use viagra or you may need a dosage adjustment or special tests during treatment.

- FDA pregnancy category B: This medication is not expected to be harmful to an unborn baby. Do not use viagra without telling your doctor if you are pregnant or plan to become pregnant during treatment.

- It is not known if viagra passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How should I take viagra?

- Take each dose with a full glass of water.

- Avoid taking High-fat food before taking Viagra as it may cause the medicine to take more time to start working.

- Viagra is usually taken only when needed, 30 - 90 minutes before sexual activity. The medication can help achieve an erection when sexual stimulation occurs. An erection will not occur just by taking a pill.

- Do not take viagra more than once a day. Allow 24 hours to pass between doses.

- Store this medication at room temperature away from moisture and heat.

What happens if I miss a dose?

- Viagra is used as needed, so you are not likely to miss a dose.

- If you miss a dose of Revatio, take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

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