Are you asking for links to be added somewhere to our site to these two resources? I couldn't find a medical encyclopedia (just a dictionary, that, while interesting, was confusing for me to use because of where they placed their google ads). Here's the drug info link:

http://www.nlm.nih.gov/medlineplus/druginformation.html

The dictionary is here:

http://cancerweb.ncl.ac.uk/omd/