it might potentiate it a little, but benadryl would mainly help to eliminate the itchiness that accompanies a lot of opiate highs.
Actually, benadryl helps potentate opiates quite well, and ime does NOT get rid of the itching whatsoever. Just sayin..
dude! same here! I love it when I'm nodding out and get really itchy because like you said it feels sooooo good