Any Ped5 inhibitor significantly decreases blood pressure. Like I mentioned many men take it for reducing their blood pressure , only 5 mgs, and better erection quality .
I've certainly had flushing of the face even with those cheap blue pills you get out of vending machines.
There were some pills backing around 2006 called aspire36 as they had a Pdee5 inhibitor in them that was not listed in the ingredients. I actually used them on spring break 2008, and had a very stuffy nose it was miserable. The company palto auto Labs , if I remember correctly without looking up, got fined by the FDA. I wouldn't be surprised if some sexual supplements are spiked with PD e5 inhibitors from what I understand they're stronger pde5 inhibitors then Cialis n Viagra.