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Viagra prices in online pharmacies

We list below the prices comparison for both brand name Viagra and Sildenafil (generic viagra) in 4 different online pharmacies. Before purchasing viagra online, make sure to compare prices, shipping options, and delivery time. All the pharmacies in the list have massive customer satisfaction profile. For more information about Viagra, click here
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Sildenafil, the active ingredient in Viagra, was discovered by accident during an investigation into new treatment for pulmonary arterial hypertension and angina. The chemical was developed by pharmaceutical company Pfizer in the 90s and, though it was found to have no discernible effect on hypertension, it was discovered that the drug consistently produced penile erection in the men in the sample.

Further investigation was made and the drug was patented in 1996. Stimulation of the penile shaft – whether caused by physical contact or exposure to erotic stimuli – results in the release of nitric oxide. This NO aids in the relaxation of the arterial muscles of the penis, resulting in the development of an erection.

PDE5 inhibitors, such as Viagra, function by replacing the PDE5 with itself, helping the relaxation of the arterial muscles, and consequently increasing the success of the erection. Viagra was the first erectile dysfunction drug approved by the Food and Drug Administration for public consumption, and made an incredible $1 billion in its first two years on the market.

Currently, the drug is officially available in the US and the UK on prescription only, but Viagra is still advertised directly to the public and there have been pilot projects in various stores and chemists where the drug was sold without an official consultation. Online retailers willing to trade the drug without any medical consultation whatsoever are plentiful, and most people receive masses of junk email advertising for the product every week.

Viagra tablets are blue and diamond-shaped, with the company name (Pfizer) on one side, and the name of the drug and its dosage on the other. There are numerous, less than reputable online traders who deal in 'herbal' or simply faked versions of the drug, and these are not always easy to discern from the genuine article.

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