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You would want to discuss with your doctor what class of antihypertensive medication you are taking, what dose, and what the possible risks might be. The patent for Viagra (sildenafil) will not expire until 2012; therefore, no generic form is currently available.

A: When taking more than one medication, it is important to make sure there are no drug interactions. A: Viagra (sildenafil) is classified as a phosphodiesterase 5 enzyme inhibitor.

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In clinical studies, Viagra was given to more than 3,000 patients aged 19 to 87 years with erectile dysfunction of different causes. These individuals should have no more than 25 milligrams (mg) of Viagra at a time, and not more often than every 48 hours. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. Once the muscles are relaxed, blood flow is enhanced. Gharbia, PharmD Q: What's the problem with taking Viagra occasionally two times in the same day, maybe 12 or so hours apart?

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Brindis RG, Kloner RA "Sildenafil in patients with cardiovascular disease." Am J Cardiol 92(9 Suppl) (2003): 26-36 30. Each trial lasted 24 weeks and evaluated the efficacy of flibanserin compared to placebo in premenopausal women. When the patent expires, other drug companies can start manufacturing and selling a generic form of the drug that is usually less expensive. This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. When the patent expires, other drug companies can start manufacturing and selling a generic form of the drug that is usually less expensive.

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Pharmacokinetics in Special Populations Geriatrics: Healthy elderly volunteers (65 years or over) had a reduced clearance of sildenafil, resulting in approximately 84% and 107% higher plasma AUC values of sildenafil and its active N-desmethyl metabolite, respectively, compared to those seen in healthy younger volunteers (18-45 years). Viagra has a host of close relatives such as Cialis (tadalafil) and Levitra (vardenafil), which offer similar effects. Kimberly Hotz, PharmD Q: Is there a generic for Viagra? The patent for Viagra (sildenafil) will not expire until 2012; therefore, no generic, less expensive form is currently available. Consult your health care provider for recommendations based on your specific circumstances. Effect of VIAGRA on Blood Pressure When Co-administered with Alcohol VIAGRA (50 mg) did not potentiate the hypotensive effect of alcohol (0. This analysis was performed retrospectively, and was not powered to detect any pre-specified difference in adverse reactions. But it has been prescribed off-label for women with a low sex drive. Sailesh Kumar, from the University of Queensland and the Mater Research Institute, said his study aimed at reducing foetal distress during childbirth and used a much lower dose of Sildenafil and for a much shorter period. "It's a very, very different study [from the Dutch trial] and the drug is used in a very different context," Professor Kumar said. "The women in our trial used up to three tablets — but generally only one tablet during labour. "I spoke to the lead investigator of the Dutch study where there was an unexpected spike in the number of neonatal deaths in the group of mothers who received Sildenafil. "And because of this, [the child deaths] … and also because the overall result did not show any benefit in terms of improving growth of these babies, they stopped the study." Overall dose much greater in Dutch study The Dutch study involved taking Viagra many more times and over a longer period. Some of the more common side effects seen with Viagra are headache, flushing, nasal congestion, abnormal vision, diarrhea, dizziness, and rash.