While 4/5 is shocking any way you look at it, the stronger argument for why this stat is misleading is because it does not take into account how long the prescription lasts. Anecdotally, I was given basically a week's worth after all 3 of my surgeries. Tough to find stats on these things but I could see opiod prescriptions being 2x the number of prescriptions because the number of "doses" are half what other non-addictive substances are. Still, that would make opiods 2/3 of pharmacy-filled "doses".