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Viagra is a patented medication for curing erectile dysfunction and is manufactured by the pharmaceutical firm, Pfizer. Generic Viagra is a term that is given to any product that contains sildenafil citrate and has a similar composition to Viagra. Genuine generic Viagra information is hard to obtain since there are so many sites that promote Viagra rip-offs or products such as natural Viagra, herbal Viagra and other similar unsubstantiated products. It is best to consult your doctor and ask for some good generic Viagra or you can consult sites that always carry good information regarding all sorts of medications. One of the first things that people are interested in when it comes to information on this drug is the price. Generic Viagra can be obtained at a rate that is at least seventy percent lesser than the branded Viagra manufactured by Pfizer. viagra at boots what is generic version of viagra cialis levitra viagra vs price of viagra over time