I have taken all three of the ED medications and would like to share
their relative effectiveness.  I have taken Viagra in doses ranging
from 25mg to 125mg (recommended dose 100mg), Levitra both 10 and 20 mg
(recommended dose 20mg), and one Cialis dose of 10mg (recommended dose
10mg to start and 20mg maximum dose).

I experienced nasal stuffiness with all three meds and the famous
“blue haze” with Viagra.  Nothing else with the other two
except I did get a very minor headache for a couple of hours after
taking Cialis.  It is quite possible the headache had another source.
Whatever the source, it was not significant.  The nasal stuffiness
with Cialis lasted well in excess of 24 hours, unlike the other two
just as my doctor predicted.  As to erectile function, all three had
exactly the same effect, which for me was nothing at all except
engorgement while standing in the shower.  The engorgement with Viagra
was much more impressive at all dose levels than with either of the
other two meds.  Cialis was the least effective, and I do not expect
anything as significant as with Viagra even at the higher dose of
20mg.  So far, nothing to write home about with any of the meds
although spouse and I did get one “stuffing” with Viagra
and a ring holding everything together although it was purely
mechanical, very short lived, and with no gratification for either one
of us.

There is my story with these meds.  If the 20mg Cialis does anything
significant, I will let everyone know.  I would like to hear
comparisons made by others.  I know each one of us reacts differently
to the same medications and what works for one does not work for
others.

Wishing everyone a good holiday season.  Take care all.
Dave Perry