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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. cialis sample pack 59 users found this comment helpful. Did you? Yes No Report as inappropriate A high fat meal may delay the time of the effect of this drug. seizure (convulsions); or

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Contraindications

does viagra work Viagra: 25 mg, 50 mg 100 mg tabletsIf you are about to start taking any new medicines, especially nitrates, tell your doctor and pharmacist that you are taking Viagra. The following serious adverse reactions with the use of Levitra (vardenafil) are discussed elsewhere in the labeling:Excretion

The primary efficacy and safety study conducted outside the US included 268 patients, with a mean age of 56 years (range 21 to 78 years). The population was 86% White, 3% Black, 0.4% Hispanic, and 10% of other ethnicities, and included patients with ED of various severities, etiologies (organic, psychogenic, mixed), and with multiple co-morbid conditions, including diabetes mellitus, hypertension, and other cardiovascular disease. Ninety-three percent of patients reported ED of at least 1-year duration.Women in the study were given doses of 50 milligrams, which was increased to 100 milligrams only once during the study based on how well the lower dose was working, and the women's tolerance to it. The pill was to be taken prior to sexual activity but no more than once daily. Erectile dysfunction