I remember when I tried viagara, fuck me, I couldn't walk. I was waiting for an out call to arrive, so was a bit excited already, well, Jesus, I honestly couldn't walk as it made my cock so sensitive, anything it touched just felt like I was about to shoot myload lol. Not too mention the headache and full nose.
I then tried a cialis tablet which was far better. I found if you take one the day before the sex, it will last about 4 days. The day off taking it I get a headache and full nose, alcohol makes it worse but after that no side effects but still hard ons on demand lol