erectile dysfunction
"Yes, I achieved good erections after about 40 to 50 minutes and yes, I could repeat the experience a week or two later, however, the side effects drove me away from it.  
Side effects: (An annoyance, blue tinted vision, lasting about 2 hours.) First; Migraine like headaches.  No conventional medicines would relieve the pain, sensitivity to light, nausea and lethargy.
And, the most disturbing, difficulty swallowing for about 3-4 hours!!

I ended up switching to 'Levitra'.  Only a mild headache and some other minor effects for 2-3 hours.  Not quite as good of an erection though (80% to 90% as good)."