I would assume those medical errors include overdosing more hardcore meds?
My opinion on subq is widely frowned upon, I find it to be very low risk. With a couple hundred injections per year on average, most without swabbing neither the vial nor skin I am still infection free.
So statistically I do consider it unlikely to be problematic. Worst I’ve experienced was from a subq testosterone injection, the oil was definitely NOT clean, so that ended up being a bit nastynasty for a while.
It’s individual too I guess, but my understanding is that the risk of infection subq is moderate at most, even if the product isn’t 100% sterile.
(I wipe like a maniac when I do IM though), not because the risk of infection is that much higher, I think it might actually be lower, but if you get an infection IM it’s a bit more problematic