i doubt very much that the pdr can be accessed on line for free as it is a proprietary property (privately owned). they do allow free access to certain professionals, but plain old staff nurses and nursing students are not part of that privileged list (i just went to their website and checked).
here is another online site to look up medications: http://virtualnurse.com/
you can find medications by clicking on a category of the medication as listed on the web page or clicking on a letter of the alphabet to get the drug information. drugs are listed by both brand name and generic name. you will be taken to more links for information about the individual drugs, many of them websites sponsored by the manufacturer of that drug where you may find a pdf file with the very exact same information that is printed in the pdr about that drug!
you should also become familiar with this site:
which is designed to give the general lay public information about the specific drugs they are taking, very much like the information sheets you get from a pharmacist with each prescription you have filled.