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Viagra an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Sildenafil citrate is also used to treat PHA pulmonary arterial hypertension. This drug was developed by the pharmaceutical company Pfizer and they are also involved in marketing it. This medication basically works by inhibiting an enzyme that is known to restrict blood flow in the penis. więcej...

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