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Viagra (sildenafil) is an oral medication that treats erectile dysfunction (ED). It works by causing more blood flow to the penis. This helps you to achieve and maintain an erection. You can take Viagra 30 minutes to 4 hours before sexual activity. But it shouldn t be taken more than once daily. For most men, Viagra begins to work within an hour. viagra nitroglycerin The ACC/AHA consensus document on sildenafil (Viagra) 1 takes a very cautious approach to interaction between organic nitrates and sildenafil, suggesting that neither should be used within 24 hours of the other in any dose and by any route of administration. Find everything you need to know about Viagra (sildenafil) (injection), including what it is used for, warnings, reviews, side effects, and interactions. This includes nitroglycerin

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