http://www.RxBuyersClubUSA.com might help

Trucliec: Each medication of the 3 involved do something different to cause an erection, its quality and its duration I dont know how Dr's decide which is appropriate but to say DBL Strength really is misleading when 3 active ingredients are invloved providing different results. Check out for a summ...

Ive used sudafed with fine results. I was on hour 5+ and it was getting painful.
Took 4 tabs , went to sleep and had no issues.

You can buy a "knock down" or reversal shot.
But really the active ingredient is the same, just not the delivery or qty.

Cheers -H