I try to only use them if my hormones are acting up and I don't feel as "confident" as I do normally. I save them for special occasions like a sloppy, drunken evening with the wifey when she needs to be punished.
I get the most punishing headaches from that stuff the next day so I usually break a capsule and empty the contents, using just half a dose and drinking lots of water. With a little arginine, you can stretch those out a long way. I can't tolerate a full dose. My dick damn near snaps off from getting so hard, I pop too many random chubs for the next few days and I can barely breathe without getting a throbbing headache.