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 What is Viagra?

Viagra (sildenafil) works as a muscle relaxation drug for relaxing muscles found in the walls of vessels of blood and helps increase the flow of blood to particular parts of the body.

The main function of Viagra and people buy generic Viagra online is to treat erectile dysfunction (impotence) mainly in men. Another name by which the drug is known is Revatio, which is taken to treat pulmonary arterial hypertension and to make both men and women capable of exercising more and more.

Viagra generic

Generic versions of Viagra are available. A generic drug is an exact copy of the active drug in a brand-name medication. The generic is considered to be as safe and effective as the original drug. Generics tend to cost less than brand-name drugs.

Viagra contains the active drug sildenafil.

Viagra side effects

Viagra can cause mild or serious side effects. The following lists contain some of the key side effects that may occur while taking Viagra. These lists don’t include all possible side effects.

For more information on the possible side effects of Viagra, talk with your doctor or pharmacist. They can give you tips on how to deal with any side effects that may be bothersome.

Note: The Food and Drug Administration (FDA) tracks side effects of drugs it has approved. If you would like to report to the FDA a side effect you’ve had with Viagra, you can do so through MedWatch.

Mild side effects

Mild side effects of Viagra can include:*

• headache
• flushing
• indigestion
• mild and temporary vision changes, such as a blue tinge in your vision, blurred vision, and sensitivity to light
• nasal congestion (stuffy nose)
• back pain
• muscle pain
• nausea
• dizziness
• rash

Most of these side effects may go away within a few days or a couple of weeks. But if they become more severe or don’t go away, talk with your doctor or pharmacist.

This is a partial list of mild side effects from Viagra. To learn about other mild side effects, talk with your doctor or pharmacist, or view the drug’s patient information.

Serious side effects

Serious side effects from Viagra aren’t common, but they can occur. Call your doctor right away if you have serious side effects. Call 911 if your symptoms feel life threatening or if you think you’re having a medical emergency.

Serious side effects and their symptoms can include:

• Non-arteritic anterior ischemic optic neuropathy (NAION), which is an eye condition that causes damage to your optic nerve. Symptoms can include:
• sudden decrease in vision in one or both of your eyes
• sudden loss of vision in one or both of your eyes
• Sudden decrease or loss of hearing. This condition may also involve other symptoms, such as:
• tinnitus (ringing or buzzing in your ears)
• dizziness

Other serious side effects, which are explained in more detail below in “Side effect details,” include:

Allergic reaction

• priapism (long-lasting and sometimes painful erection)
• low blood pressure, if Viagra is taken with certain other medications
• cardiovascular problems, such as heart attack, irregular heartbeat, or stroke, all of which occur mainly in people with heart disease

Side effect details

You may wonder how often certain side effects occur with this drug. Here’s some detail on several of the side effects this drug may cause.

Allergic reaction

As with most drugs, some people can have an allergic reaction after taking Viagra. In clinical studies, less than 2% of people who took Viagra had an allergic reaction. It’s not known how often allergic reactions occurred in people who took a placebo (no active drug).

Symptoms of a mild allergic reaction can include:

• skin rash
• itchiness
• flushing (warmth and redness in your skin)

A more severe allergic reaction is rare but possible. Symptoms of a severe allergic reaction can include:

• swelling under your skin, typically in your eyelids, lips, hands, or feet
• swelling of your tongue, mouth, or throat
• trouble breathing

Call your doctor right away if you have a severe allergic reaction to Viagra. But call 911 if your symptoms feel life threatening or if you think you’re having a medical emergency.