I'm not an attorney, and nothing I say should be construed as legal advice. With that said, there are at least two other companies selling kits with prescription drugs in them. In this case as in the others I'm aware of, a doctor holds a telephone consultation with the customer and prescribes medications based on their history and needs. This, as far as I can tell, fulfills all legal requirements.

I'm not a doctor, and nothing I say should be construed as medical advice. Nothing is entirely safe. If you follow directions it's probably safer to use antibiotics in a wilderness medical emergency than not to. Obviously, if you have access to definitive treatment or even a consultation with a doctor you should take advantage of it.