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Nitrates8 users found this comment helpful. Did you? Yes No Report as inappropriate Try not to eat grapefruit or drink grapefruit juice while you are being treated with Sildenafil Citrate .

un trastorno de los ojos como retinitis pigmentaria (una condición heredada del ojo);(VARDENAFIL HCI) TABLETS vigera This medicine does not contain sucrose, gluten, tartrazine or any other azo dyes.Sildenafil belongs to a class of medications called phosphodiesterase inhibitors, which work by increasing blood flow to the penis during sexual activity, resulting in an erection. Viagra (sildenafil) is used for the treatment of erectile dysfunction. Viagra works by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Nitric oxide allows the smooth muscles inside the penis to relax, promoting more blood flow to the area during sexual arousal or stimulation. Viagra begins to work within about an hour and the effects can last for up to four hours. In clinical studies, Viagra was given to more than 3,000 patients aged 19 to 87 years with erectile dysfunction of different causes. Dosing considerations

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Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.Visual abnormalities are encountered with Viagra, but are less likely with Levitra and unlikely with Cialis. Flushing and dyspepsia that are associated with Viagra and Levitra are less common with Cialis. Back pain and muscle aches (myalgia) may occur with Cialis, but are unusual with either Viagra or Levitra. Side effects of Cialis tend to last longer, but are less marked than with the other drugs.Viagra is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25–63%). The pharmacokinetics of sildenafil are dose-proportional over the recommended dose range. It is eliminated predominantly by hepatic metabolism (mainly CYP3A4) and is converted to an active metabolite with properties similar to the parent, sildenafil. Both sildenafil and the metabolite have terminal half lives of about 4 hours.