I'm an RN working in a New York City emergency department, and I can say without a doubt, this is the best emergency medical refrence out there, and I own quite a few of them.
Physicians should find this book especially helpful.
Everything is organized by chief complaint, and then individual conditions. The book tells you, succinctly, exactly how to treat each condition, what drugs/dosages/treatments to use, what signs and symptoms are common, what complications to look for, what tests to order, and what pitfalls to avoid.
I have never seen a better refrence, and I use it all the time.