If there’s one sexual dysfunction cure or drug that is known all around the world, it’s Viagra – the popular blue pill has seen tons and tons of exposure over the last decade. Originally marketed back in 1998, it has became a staple of male enhancing pills and drugs. Still, due to some possible side effects, it’s not a free purchase drug, it’s still prescription only Viagra, however, if you are persistent and you really want to get your hands on some blue pills, there are plenty of places online that will let you get generic Viagra with a simple purchase and just a few clicks. Just make sure to check their credentials, you want to make sure you’re getting the real deal, not some cheap copy.Viagra exists only for males, there’s no Viagra for females yet, simply because the causes of dysfunction are completely different with males and females. With males, it’s more of a chemistry and mechanics problem, when females have excitement and sexual issues, it’s usually psychological.
It’s very easy to explain how exactly does Viagra affect men. The penis itself has very specific muscle structure, and it’s not muscles or bones that tighten up when you get an erection, it’s just a simple pressure issue, valves that lead blood to penis open up wider and ones that lead blood out close up, making a penis hard. Brain is responsible for the beginning of this process, when a man sees something he interperts as sexually exciting, the enzymes create a chemical that affects blood flow and valves, but at the same time a second chemical is produced, one that cancels out the first 
chemical. Viagra manages to improve sexual performance with males by canceling out effects of the second chemical, making an erection much longer lasting. Bear in mind that Viagra does not just magically create an erection, a man still needs to get excited for it to work, and it is a drug that needs to be taken at least an hour before sexual encounter for it to be in full effect when you need it.
Viagra is more or less universal drug, percentages of men that do not get a positive effect from it is very, very low. Even men with healthy sex life can put Viagra to use if they want to, it will improve their sex life as well. As for who shouldn’t take Viagra, anyone with a heart condition should steer clear of it, as well as anyone who is on some other medicine, before you start taking Viagra you should really check in with your doctor to make sure it’s safe for you to do so. Medicine that affects levels of nitric oxide in body are especially dangerous when mixed with Viagra, they can even lead to a heart attack when combined.