Sildenafil
"I'm 57 & enjoy an active sex life with my wife.  In the last few months erections were not as strong & I had not been able to maintain it a couple of times.    During my physical I talked to my PA about my problem staying hard & she said I wasn't that old & should still be enjoying sex & suggested I try Viagra.  I take a half pill (50mg) & other than a flushed feeling (let's me know it's working) I have no side effects.  With the extra blood flow I'm as hard as I can remember & my wife says she can tell I'm longer & thicker so  I can relax and not stress over it"