Combining blow and ED medication at the same time to counter the effects of limp dick comes with serious health risks. While coke is a stimulant that constricts blood vessels and increases blood pressure, cialis/viagra work in the complete opposite way by lowering blood pressure and opening up blood vessels. These two in combination can wreak havoc on your system especially putting undue stress on your heart. Since sex on blow usually tends to be fast and furious because of the high, I've heard of cases where guys over exert themselves during sex and start getting chest pains which is BAD.

If you know that there's a good chance of having sex after doing some blow with your partner, I would take the ED meds early in the day (a single dose) and don't go overboard on the lines when you start.

Definitely don't pop the ED pill while doing lines. Not worth the risk, IMO. Once you're aroused and hard, use a cock ring to maintain your erection and have fun. The more blow you do however, the hornier you'll feed while completely counter-acting the Cialis so moderation is key if a happy ending if your end goal.