I use 25 mg of viagra, which is a low dose I cut up 100mg into four
pieces so it is quite economical.

I am only 32 though, so worry about using this stuff. I have some
slight worries-
My impotence is from prostatits which has caused nerve damage and is
irritated when i sit on my butt all day.

I worry that I may have the erection for too long. The sex is long, so
i can please my girl, make her come. After sex I still have it up for
while, and it may still be up while I am sleeping. I just worry that it
may be up for too long and damaging the penis. I think it is ok, but
when you are sleeping it is difficult to know how much it has been up
with my latest girlfriend when we have sex, she does this thing where
she holds the penis in her and it gets really hard for a bit at a
unusual angle.  When I say unusual angle I mean she bends it down a bit
which makes it a bit. After sex my penis is a bit sore. After having
sex on Sat and Sun night and taking viagra on both ocassions my
erection last night by myself unaided by viagra was pretty crap and my
penis was sore.