I need a better iPhone drug app

I am a nursing student. I have been using Epocrates on my iPhone as my reference source for medications. But now that I am further along in the program, we are being asked to know IV administration rates, drug and acid/base interactions, onset of action and half-life of medications and such. I can’t seem to find this information in Epocrates, at least not in the free version I’m using. I have to keep Googling things while at home and I’m not always sure I’m getting my information from a top notch medical website.