OK, how to explain this?
There is no room for error with the m, in this concentration, pictured. (1:1000.) That is for use by medical professionals ONLY, and even then, there can be mistakes in an emergency. And unfortunately, with this, mistakes can be deadly. (See stories in Comments section of article listed below.)
That's why ampules are still sometimes used for metered doses, or more commonly, autojets, like this, below. (Note the concentration is diluted AND it comes with a luer lock and protected needle so nurses and others administering it don't stick themselves by accident or it doesn't go into a vein or IV line any way other than purposefully):
View attachment 190489
To help you understand, you can read this:
https://acls-algorithms.com/acls-drugs/acls-and-epinephrine/
"The 1 mg dose can typically come in two forms 1:10,000 (most common). 1:10,000 is the dilution. This means that there is 1 mg in 10 mL of fluid.
The other concentration is 1:1,000. This means that there is 1 mg in 1 mL of fluid. For intravenous purposes, this needs to be diluted with 9 mL of fluid to make the concentration 1:10,000."
_____________________________________________________________________________________________
By comparison, the EpiPen delivers Epinephrine in these concentrations (and remember, it is injected into a large muscle in the leg, not directly into the vein, like the ones above are):
Table 1. EpiPen Auto-Injector dosing 1
Auto-Injector Epinephrine Concentration Patient Weight
EpiPen® Auto-Injector 0.3 mg (0.3 mL, 1:1000) ≥30 kg (≥66 pounds)
EpiPen Jr® Auto-Injector 0.15 mg (0.3 mL, 1:2000) 15-30 kg (33-66 pounds)
EpiPen® (epinephrine injection) Auto-Injector | Administration
_____________________________________________________________________________________________
So really, there's no way those vials you listed should ever be circulating among the general public.