It is recommended that you speak with your local doctor before beginning to take Viagra or any erectile dysfunction drug. Your doctor can write you a prescription, or you can go online to purchase Viagra.

It is best to use a U.S.-based online pharmacy that lists a physical address and phone number on its website. After filling out the online medical questionnaire, speak with a customer-service representative to ensure you are receiving genuine Viagra manufactured by Pfizer.

Be aware of websites that offer "generic" Viagra, because none actually exist. Pfizer's patent on Viagra does not run out until 2012, and "generic" Viagra is actually illegal in the U.S. Most "generic" Viagra is made in foreign countries, with no FDA oversight, so many times more or less of the active ingredient is included, and potentially harmful ingredients are often included in the pills as well. It is not worth the money savings or health risk to buy "generic" Viagra.

One U.S.-based website that provides U.S.-licensed doctors and pharmacists is www.viamedic.com. This website has been around for 10 years and provides only genuine, FDA-approved medications. You can call their customer service line with any questions, and their doctors will even answer your questions if necessary.