erectile dysfunction
"Age 67.  I have used Levitra, Cialis, and Viagra since prostate surgery 17 years ago.  My longest experience is with Levitra.  Usually take it in the morning on an empty stomach.  For a long time I was able to get a good erection with 10mg within about 30 minutes.  Head stuffiness was minimal.  A few weeks ago I had a couple of Levitra failures, meaning that I was unable to get more than a weak erection.  About 3 weeks ago I then switched to 20mg doses, and erection results were really excellent.  Stuffiness did not increase significantly if over the 10mg dose.  However, two days ago, even the 20mg does failed to produce a good erection.  After some manual stimulation I was able to get an erection barely good enough for sex."