erectile dysfunction
"At 76 I need a little push (or kick in the butt). I got the 25s. Used a couple of prescriptions over time and wanted to try a 50mg dose. Doubled my 25s and found no improvement in erection length of time - I'm back to the 25s.
Overall Viagra does it's job IF some foreplay is engaged in. 
I take to interfering medications and I'm very happy with the product"