That's just doing the same number fuckery in the other direction.
76B doses being a six month supply would mean 416M doses a day for America's 50M people with chronic pain (not all of which have pain conditions suited to opiate treatment, incidentally). Almost ten doses a day for each and every one one of them?
I'm contesting the "76B doses is about a 6 month script for every patient with chronic pain in the US" statement, as well as the idea that every chronic pain patient needs opiate treatment.