Guys:
Whoever said that adrenaline is used for anaphlyaxis only is just plain
wrong. Adrenaline is a vasoconstrictor, it forces blood vessels to contract, raising blood pressure. It plays an important part of Advanced Life Support.
If you don't believe me, try asking these people:
Resucitation Council UK - The body that sets UK guidelines on the resuc of patients for
all medical staff and allied professionals.
In particular, examine this document:
http://www.resus.org.uk/pages/alsalgo.pdf
Yes, the team are aware that adrenaline is generally
not administered via IM injection during rescuc, and that IV lines are required. However:
1) We don't want to animate hooking up an IV line. It just would look ****.
2) We don't want resuc of a dying player to take 20 minutes.
3) We wanted to get rid of the
very unrealisitic defib.
4) The EpiPen is something that players are probably familiar with and will recognise
...it was decided to go with the Pen instead.
Now, you can argue that it's unrealistic all you want... but so is the idea of a combat medic carrying a frakkin' AED around with him - Tonka, if you are a few weeks away from your EMT qualification then you'll know exactly how heavy a defib unit is. And you'll know full well that combat medics do
not carry one for use in trauma care.
The defib was a metaphor for patching up the wounded soldier and getting him out of the combat zone. That's all the EpiPen is, but it's coupled with the chest compressions to allow players to be "unstuck" when they've glitched into the ground, and it
is something that combat medics could have access to in the field.
If it really bugs you to think of it as adrenaline, imagine it's a morphine styrette and it's being given for the pain... but morphine diliates blood vessels and isn't something you want to administer to a bleeding patient unless you've got the bleeding under control, so *shrug* you pays your money and takes your choice.
Either way, I'm a volunteer ambulance assistant and full-time student nurse 3 months away from receiving my pin, and
I'm happy with this approach.
Nearly had to call in a medic irl lol 
my head is hard as stone so no wonder ^^