In my (extensive!) experience, the best people to have around if you have a casualty are paramedics, nurses and vets. Doctors tend to run away (fair enough, they’re on holiday too!).
Vivid memories of being very happy to be (literally) shoved out of the way by a casualty’s mate, who turned out to be a trauma nurse!
I’ve just had to a first-aid refresher, bundled in with a French mountain leader CPD course. They got a specialist 112 doctor in to talk to us. Interestingly, he had a list as long as your arm of drugs that we should consider carrying. When one of the group rightly pointed out that we aren’t allowed to administer drugs, he said “That’s right, so what you do is, you call 112, ask to speak to a doctor and talk it through with them.”