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How Generic Viagra Works?

About 70% males suffer from premature ejaculation. The good news is that most men will learn to last longer by experience. Others can cure their premature ejaculation using various ways. I am 45 years old and I am suffering from Erectile Dysfunction. I would like to try cheap generic Viagra. Can I go for this? What are the side effects of using this drug. Guys please share your experience.