Anyone know the effective life of levitra? I can't seem to find it. I know viagra usually takes 30 minutes to 1hr to be fully effective and lasts about 4 hrs. Cialis can work within about 20-30 minutes and clinically lasts 36 hrs( a lot longer with me). What about levitra? Same class of drug, what's the difference? Works better, works on a higher percentage of guys? Works longer or faster? Just wondering b/c I went to half a dozen websites and none had this info, neither did my 2004 PDR! Thanks, and knock the bottom outta' that ass Radar!