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I have heard many different things from people about ED (impotence) issue. I am a chain smoker also drink a lot and i am experiencing ED problems from past few months. I am not able to get hard in bed....
This 2003 article, Long-term Tolerance With Viagra suggests that there is a consensus amongst authorities that sildenafil (Viagra) does not have a tachyphylactic effect - i.e. it doesn't diminish in ...