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Stop using Viagra and get emergency medical help if you have sudden vision loss. A: Viagra (sildenafil) must be used with caution in patients taking an antihypertensive medication.

I am a 61-year-old male who had a prostate operation two years ago. Boolell M, Gepi-Attee S, Gingell JC, Allen MJ "Sildenafil, a novel effective oral therapy for male erectile dysfunction." Br J Urol 78 (1996): 257-61 34. The majority of Viagra side effects are rarely serious and have little or no negative impact on your experience of taking Viagra.

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If you would like more information, talk with your healthcare provider. In addition, Cialis typically has a quicker onset of action and begins to work within approximately 30 minutes.

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A: Viagra (sildenafil) and the other drugs for erectile dysfunction, such as Levitra (vardenafil) and Cialis (tadalafil), work by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. He or she will do a physical examination, look at your current medications, and will decide which medication you would benefit from.

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In fact, some of these side effects (such as high blood pressure) can be attributed to enjoying a healthy sex life as a result of taking Viagra. Warnings for people with certain health conditions For people with heart problems: This drug can lower your blood pressure. Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION), a cause of decreased vision including possible permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors. With treatment with Cialis, improvement in erectile function is possible for anywhere from 24 to 36 hours after administration of a dose, significantly longer than with Viagra. Therefore, age > 65, hepatic impairment and severe renal impairment are associated with increased plasma levels of sildenafil. Following a review of the data from these first 4 subjects (details provided below), the VIAGRA dose was reduced to 25 mg. This sexual ambivalence is what we have inherited from the Puritans. At the same time, on-treatment function was better in treated patients who were less impaired at baseline. Matt Curley, PharmD Q: Is there a generic for Viagra? REVATIO is used to treat a rare disease called pulmonary arterial hypertension (PAH). A: Viagra (sildenafil) and the other drugs for erectile dysfunction, such as Levitra (vardenafil) and Cialis (tadalafil), work by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Indications & Dosage INDICATIONS VIAGRA is indicated for the treatment of erectile dysfunction. These drugs are often used to treat similar conditions. While the precise biological actions of sildenafil in the heart are not fully understood, the drug is known to work by stopping the action of an enzyme, called phosphodiesterase 5 (PDE5A), the researcher says.  This enzyme is involved in the breakdown of a key molecule, cyclic GMP, which helps control stresses and limit overgrowth in the heart.  PDE5A is also the biological pathway blocked in the penis by sildenafil to promote the relaxation of blood vessels and maintain erections.  Funding for this study was provided by the National Institutes of Health (NIH), the Peter Belfer Laboratory Foundation and the Bernard Family Foundation.  The makers of the drug had no involvement in the design or support of the research. During the phase 1 trials, it was noted that the drug did very little to prevent angina but did induce marked penile erections.