Here is...: Sildenafil (viagra) is effective for ed with high safety profile; but no drug is 100% free of side effect. Its effectiveness is dictated by the degree of erectile functional loss from the accumulating effects of vessel/nerve-related changes by aging ; diseases, drugs, etc. Drug is able to boost up the function to cover the functional loss to a degree, but undesirable aging effect continue to pile.
Answered 8/8/2014
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