not sure about the nclex-pn app thing, but as for drugs, well, i can help you there! Not sure exactly what you are looking for, but I use Micromedex. It's a free drug app (think you have to sign up online, but not sure) that you can find through apple. It's been really good so far. A little different set-up from my drug book, but not bad. THe other one I use a lot is epocrates. You do have to sign up for a free account online to use epocrates, but again, it is well worth it. They have paid versions of epocrates available, with case studies and I don't know what all on there, but I just registered for free, and use what they provide through the free service. Works great! I don't think they limit what drugs you can see if you have the free version, but more like extra's such as case studies, or practical application stuff. So yeah, hope this helps, and good luck!