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 interesting:  PMID: 15975255 Quantitative determination of sildenafil (Viagra) and its metabolite (UK-103,320) in fluid and tissue specimens obtained from six aviation fatalities.Patients should not take Viagra® even if you only take nitroglycerin medication occasionally.Viagra tended to decrease coronary blood flow but not significantly.Increased understanding of the sildenafil response and effectiveness profiles and optimal sildenafil treatment are central to the appropriate management of erectile dysfunction using sildenafil.In its early tests as a hypotensive drug among young, male, medical students, it produced what is called an adverse event, an erection. Good luck!