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Viagra begins to work within about an hour and the effects can last for up to four hours. Viagra was the harbinger of things to come in the form of the pharmacology of aging and sexuality (sexual medicine is in expansion mode post-Viagra).

Patti Brown, PharmD Q: When might a generic version of Viagra be available? I have had years of this pain and headaches before something was done.

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More than 2 units of alcohol will increase the risk of negative side effects from taking Viagra and will make it more difficult to maintain an erection Dosage. Viagra should not be used in any patient who takes nitrates for chest pain. Viagra should be taken exactly as directed by your doctor. It is important to avoid nitroglycerin while taking these medications, but work is being done to develop a similar medication that can be taken with nitroglycerin.

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If you can afford to get him an echo cardiogram that will tell the doctor what is going on. The patent on Viagra is supposed to expire in March 2012 in the United States according to the United States Patent and Trademark Office.

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5 mg taken at the same time each day and without regard to sexual activity. In the event of an erection that persists longer than 4 hours, the patient should seek immediate medical assistance. There are some less common side effects that affect 2-3% of men. Many of these sites do not contain the medication you are paying for. The patent for Viagra (sildenafil) will not expire until 2012; therefore, no generic form is currently available. Levitra acts similarly to Viagra regarding possible side effects and onset and duration of pharmacologic action. Your physician is best able to determine if Viagra is appropriate for you or not. For more information on Viagra, visit www.everydayhealth.com/drugs. Nitric oxide also opens the blood vessels throughout the body, which can cause decreased blood pressure. 24, are believed to be the first confirmation in humans that sildenafil has a direct effect on the heart.  Previous research by Kass and his team showed that sildenafil had such effects in mice, blocking the short-term effects of hormonal stress in the heart.  Related studies by the group also showed that sildenafil prevents and reverses the long-term effects in the heart from chronic high blood pressure.  Moreover, Kass adds, the latest Hopkins results confirm that sildenafil helps control heart function only when the heart is under duress, but has little impact under normal conditions.