About erectile dysfunction (ED)
Don’t let erection problems keep you from a more satisfying sexual experience. Learn about a condition called erectile dysfunction (ED), and how you can treat it.

What is erectile dysfunction?
ED is when a man has difficulty getting or maintaining an erection long enough for sex. It happens when not enough blood flows to the penis.

ED isn’t the same for all men. Some men aren’t able to get an erection at all. Others can get one, but it’s not hard enough for sex. And others get a hard erection but lose it before or during sex.

ED is a medical condition. So in most cases, erections will not improve without treatment.

Many men avoid discussing ED. In fact, they often wait more than a year before talking to their doctor. But once they’ve had the discussion, most guys say they feel relieved to have finally done something about it.


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VIAGRA is prescribed to treat erectile dysfunction (ED).

Important safety information

Do not take VIAGRA if you take nitrates, often prescribed for chest pain, as this may cause a sudden, unsafe drop in blood pressure.

Discuss your general health status with your doctor to ensure that you are healthy enough to engage in sexual activity. If you experience chest pain, nausea, or any other discomforts during sex, seek immediate medical help.

As with any ED tablet, in the rare event of an erection lasting more than 4 hours, seek immediate medical help to avoid long-term injury.

If you are older than age 65, or have serious liver or kidney problems, your doctor may start you at the lowest dose (25 mg) of VIAGRA. If you are taking protease inhibitors, such as for the treatment of HIV, your doctor may recommend a 25-mg dose and may limit you to a maximum single dose of 25 mg of VIAGRA in a 48-hour period.

In rare instances, men taking PDE5 inhibitors (oral erectile dysfunction medicines, including VIAGRA) reported a sudden decrease or loss of vision. It is not possible to determine whether these events are related directly to these medicines or to other factors. If you experience sudden decrease or loss of vision, stop taking PDE5 inhibitors, including VIAGRA, and call a doctor right away.

Sudden decrease or loss of hearing has been rarely reported in people taking PDE5 inhibitors, including VIAGRA. It is not possible to determine whether these events are related directly to the PDE5 inhibitors or to other factors. If you experience sudden decrease or loss of hearing, stop taking VIAGRA and contact a doctor right away.

If you have prostate problems or high blood pressure for which you take medicines called alpha blockers, your doctor may start you on a lower dose of VIAGRA.

VIAGRA does not protect against sexually transmitted diseases, including HIV.

The most common side effects of VIAGRA are headache, facial flushing, and upset stomach. Less commonly, bluish vision, blurred vision, or sensitivity to light may briefly occur.

Please see full prescribing information for VIAGRA (25-mg, 50-mg, 100-mg) tablets.

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