The books recommended earlier in this thread are excellent choices!!!
Here is a good tip and one I continued to use throughout my NICU career:
Every time you are preparing to give a medicine, look it up in your Neofax and review all it says. Then think about the baby your are preparing to give the medication to and consider why this particular baby needs it, what you hope will be the result, and what you need to look for as possible adverse reactions/incompatibilities, etc.
After a while you will be able to nearly memorize the information, but that's not the important part. What's important is how you train your mind to think about your patient as well as how it forces you to remind yourself of the importance giving the correct medicine to the correct patient... more of that critical thinking business that's oh so important. It's also a great way to learn the medications inside and out. Of course there will be busy times and emergencies when there isn't time to read in your neofax but your prior readings and studying will give you the ability and confidence you need in the emergency situations.
I'll cross my fingers as I type this, but I can thankfully and humbly say I've never made a medication error and I've been nursing since 1991 (although I've not worked for the past 2 years). I'ts a true blessing to be able to say that... I'm not being arrogant here, just passing on some good information that was passed on to me. Sort of a "Pay It Forward" kind of thing on a tiny scale. LOL
CONGRATUALTIONS!!! I wish you a wonderful and satisfiying NICU career!!!!! 
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