I’ve have a life-threatening peanut allergy, and I just wanted to clarify something. Epinephrine in vials and injected by syringes was the only emergency treatment when I was young (early 1980s). So it’s not so much that people are DIYing treatment, as they are choosing the cheap, and generic option, which doesn’t still have an active patent. This is generally horrible and dangerous, and it makes treatment of allergies very complicated (EPI-Pens are shelf stable, I don’t believe adrenaline kits are). A lot of allergy and asthma medication is unavailable in generic forms and is prohibitively expensive, as a result. I live in Canada (where drug prices are more regulated), and without third party insurance one of my inhalers is $120. When I was in the US for grad school, that same inhaler was a $90 copay (with the insurance through my school covering 40% of brand-name prescriptions.