this is a newspaper item of a weekly medical column.  here is what the
person ask and the response.  i hope it will be of use.

~ curtis
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Question - a couple of months ago, i read a letter in your column about
a man with allergies.  because of an enlarged prostate, he couldn't take
the usual over the counter antihistamines.

you suggested the herb, stinging nettle, as a substitute that might
relieve allergy symptoms and improve the flow of urine..  my husband
looked these stinging nettles up and began taking them.  he has improved
100 per cent in both his allergy condition and his prostate symptom of
frequent urination.  in addition, his psa number has come down.  

the urologist said, "yes, i've heard of it and it helps some but not
others."  we are so glad you mentioned this herbal medicine and we have
shared the information with others.

=======

answer - stinging nettel (urtica dioica) has a long history in folk
medicine as a diuretic and an expectorant.  scientific studies has
confirmed that extracts of stinging nettle increase urine flow and help
alleviate symptoms of prostate enlargement and nasal allergies.

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