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Viagra also known as Sildenafil citrate is a drug used to treat erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed by the pharmaceutical company Pfizer. Buy Viagra online to be used on inhibiting cGMP specific phosphodiesterase type 5, an enzyme that regulates blood flow in the penis. Since becoming available in 1998, Viagra has been the prime treatment for erectile dysfunction. Its primary competitors on the market are Cialis and Levitra.
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