How to use Viagra

Use Viagra as directed by your doctor. Check the label on the medicine for exact dosing instructions.
Viagra comes with an additional patient leaflet. Read it carefully and reread it each time you get Viagra refilled.
Taking Viagra with a high-fat meal may delay the time of onset of Viagra .
Take Viagra by mouth as needed between 4 hours and 30 minutes before sexual activity (about 1 hour before is most effective).
Do not take Viagra more often than once daily as needed.
If you are taking Viagra in doses greater than 25 mg, do not take an alpha-blocker (eg, doxazosin) within 4 hours of taking Viagra . Taking these medicines at the same time may cause very serious side effects such as severe low blood pressure.

Ask your health care provider any questions you may have about how to use Viagra .