There is only one study that I know of and, unfortunately, it was done by
Pfizer.  I wish I could cite it for you.  It was certainly cited here, but I
can't imagine how many "Viagras" you'd have to go through on a search.
Maybe try searching Pfizer (after verifying the spelling).

Viagra, to keep tissue healthy, uses the vascular system - blood vessels.
Blood vessels that are not used have a hard time letting flow flow. Blood
vessels get hammered after RP or RT! Common sense reveals that without blood
vessels there can be no erection.

I have run this by every doctor that I know. Each knows of no study, yet
each understands the reasoning and concur.

Best suggestion is to get the 100 mg tablet and cut it four ways leaving one
with 25 mg a quarter. 25 mg is all you need in most cases. Assuming that ine
can get 6 tabs a RX, then one has 24 doses for a 30 days period. Take every
other day.

That is what I did after radiation. After almost two years on HT and 3 years
after RT & Brachy, I still have erections..... :)

I believe that common sense is the reason.

Look into generic ED drugs. IMHO just as effective and MUCH cheaper.

Tom

you will have to do some digging, but in april 2003, there was a report
that came out and promoted the use of 100 mg of viagra after an RP.  

the report did have clinical studies and facts and figures in it....

~ curtis

knowledge is power - growing old is mandatory - growing wise is optional    
"Many more men die with prostate cancer than of it. Growing old is
invariably fatal. Prostate cancer is only sometimes so."
http://community.webtv.net/PALMER_ENT/doc