Earlier quoted context omitted.
You can actually purchase the naloxone spray and carry it as a regular person. I've been thinking about getting some but I've heard gnarly stories about people reacting pretty intensely/dangerously after receiving the drug (eg attacking the person administering the drug)
Yeah the nasal spray should work within a couple of minutes. But even IM (5 minutes) is going to be pretty brutal. You imagine going from a numb high... to feeling everything you were blocking out with opiates. Many of these people have legitimate pain. You'd probably not be too happy. I'd certainly be wary about administering it to a stranger, without their consent and without knowing what their reaction would likel…
I think you meant "physical pain"