Frequently Asked Questions About Viagra

This list of frequently asked questions and answers on Viagra has been developed by CDER’s Drug Information Branch in response to the numerous telephone calls we have received. If you have other questions concerning Viagra or any other human drug products, please feel free to call Drug Information Branch (301) 827-4573.

1. What is Viagra for?

Viagra is approved for the treatment of men who have difficulty having and maintaining an erection (impotence).

2. How does Viagra work?

An erection is the result of an increase in blood flow into certain internal areas of the penis. Viagra works 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.

3. How do I take Viagra?

Viagra is taken orally as a once daily dose, one hour before sexual activity. For more detailed information consult with your health care provider.

4. How will Viagra be supplied?

Viagra will be available as oral tablets in 25mg, 50mg and 100mg strengths.

5. Will Viagra be prescription or over-the-counter?

Viagra will be available by prescription only.

6. Are there any side effects with Viagra?

As with any drug products, there are side effects of the product in some people. The most commonly reported side effects in patients treated with Viagra during the testing of the product were: headache, flushing, stomach ache, and mild and temporary visual changes (color perception changes, light perception changes, and blurred vision).

7. Can Viagra be used with other treatment for impotence?

The safety and effectiveness of Viagra when used with other treatment for impotence has not been studied. The use of such treatments in combination with Viagra is not recommended at present.

8. What if I am taking other drugs?

Always discuss with your health care practitioner ALL of the medications you are taking (prescription and over-the-counter). In that way, you can receive the best advice for your own situation. At present, Viagra is not recommended for people taking nitroglycerin because the combination may lower blood pressure.