I don't know why I suffer from imposter syndrome so much. A woman is filling used mayo bottles up with ranch dressing and red kool-aid dust, then shipping it via ground mail to customers who won't get it for 3 weeks. What's holding me back ?
A syringe in the middle of the EpiPen is filled with epinephrine; one end is connected to a 15.2 mm long needle, and the other is closed by a plunger. When the needle assembly is fully extended from the device, it reaches a hard stop. The spring continues to push downward, now driving the plunger through the syringe and pushing the drug through the needle.