I have used viagra since it came out as I had prostrate cancer at same time and resulting treatments caused impotency.
Levitra gave me the hardest and longest lasting hardons and seemed to last about 12 hours. Very slight headache at first but not noticable after couple hours.
Cialis didn't appear to last as long as levitra! I know its supposed to be other was around but.....what can I say.
Viagra definitely gives me a headache and upset stomache. Good hardons but only about 3 hour window.
So there - one man's experience over a 8 month period!
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