Viagra is approved for the treatment of men who have difficulty having and maintaining an erect penis for satisfactory sexual performance. This is called erectile dysfunction or impotence.

How does viagra work?

An erection is the result of an increase in blood flow into certain internal areas of the penis. Viagra and other PDE5 inhibitors (like cialis and levitra) work by enhancing the effects of one of the chemicals the body normally releases into the penis during sexual arousal. This allows an increase of blood flow into the penis.

How do I take viagra?

Viagra pills are taken orally (maximum once per twenty-four hour period) about one hour before sexual activity. For more detailed information consult with your health care provider.

How long does it take for viagra to be effective?

When consumed orally on an empty stomach, maximum observed plasma concentrations are reached within 30 to 120 minutes (60 minutes is average for the maximum level to be seen in the blood stream). The effects of viagra can last up to 4-6 hours, but the response at 4 hours is less than it was 2 hours after consumption. When viagra is taken with alcohol, the rate of effectiveness is reduced. Delayed onset may result when consumed with food.

Are there any side effects with viagra?

Viagra is extremely safe and offers very few side effects. As with any drug product, there are side effects of the product in some people. 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. Stomach ache and abnormal vision are more common at 100mg than at lower doses.

Can viagra be used with other treatments for impotence?

The use of viagra in combination with cialis, levitra, or any other medication for treating erectile dysfunction is not recommended.

What should a man be aware of before taking viagra?

Talk to your doctor if you’re taking antibiotics or antifungal drugs before taking viagra. If you are older than age 65, or have serious liver or kidney problems, your doctor may start you at the lowest dose (25 milligrams) of viagra. If you have prostate problems or high blood pressure for which you take medicines called alpha blockers, your doctor may start you on a low dose of viagra. If you are taking protease inhibitors, such as for the treatment of HIV, your doctor may recommend a 25mg dose and may limit you to a maximum single dose of 25mg of viagra in a 48 hour period.