In regular book format I have checked out many drug guides & prentice hall has always been my favorite. It's also the one my school recommends (I've been an LVN for 6 years & am about to start my last semester of the RN program). I just got a PDA & am debating on which drug guide to get. I already have the free epocrates, but it seems rather brief on explaining the pathophys of how the drug works, which my school is really big on, I want to get the prentice hall one, but then I see everyone on here raving about the Davis one. Can anyone compare the two for me?