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Developed by leading urologists and medical scientists, Viagra (Sildenafil) was created by the pharmaceutical company, Pfizer. Viagra was patented in 1996, and approved for the use of erectile dysfunction by the Food and Drug Administration on March 27, 1998. Viagra has now been on the market for over 10 years, and has helped over 25 million men with erectile dysfunction. Viagra has helped revolutionize the way patients and doctors address sexual health issues. As more and more adult males suffering from impotency realized that Viagra offered them a chance at regaining the sexual intimacy that they had once deemed unattainable, Viagra sales topped the charts. Even former presidential front-runner, Bob Dole, agreed to a nationally televised endorsement campaign geared at letting even the conservative adult male know that there was indeed a treatment for their Erectile Dysfunction.
Viagra is ingested orally in either 50mg or 100mg tablets. It is recommended that patients ingest Viagra on an empty stomach, as the food can slow down the release of the Sildenafil into the bloodstream. Viagra generally takes about thirty minutes to fully work after which an erection can be sustained for three to four hours. Viagra is not intended to be a drug which is ingested every day, and it is recommended that the patient allow for at least 24 hours before taking another Viagra dosage. Although there have not been any conclusive reports of a Viagra overdose to-date, there could be side effects when the drug is taken too often. If you ever experience any serious side effects from taking Viagra, discontinue usage immediately and seek medical assistance promptly.
Viagra is not for everybody and there are some conditions that may prevent you from being able to take this ED drug. Viagra is only intended to treat adult males suffering from Erectile Dysfunction. Anybody who has been diagnosed with Heart Disease or is taking any form of a drug called Nitrates, or Alpha-blockers should consult with their physician before taking Viagra or buying Viagra. As well as anyone who has a history of heart problems, low blood pressure or other circulatory issues.
The Patent for Viagra is currently set to expire on March 27, 2012 according to the information available from the United States Patent and Trademark Office. This could be great news for patients but not so good for Pfizer, the producer of Viagra. If the patent expires, any drug manufacturer will be able to manufacture and sell cheap alternatives to the name brand drug, which will drive down the prices of all the current erectile dysfunction drugs, including Levitra and Cialis.
The first application for generic Viagra has already been submitted for generic sildenafil citrate (The main active ingredient in Viagra) by TEVA Pharmaceuticals. They have already received tenative approval by the FDA. However, the formal approval will depend on whether Viagra wins or loses their current court battle. If they can prove that Viagra is a new patentable idea, separate from its former use as a blood pressure medication, then the patent may be extended into 2019.