Comprehensive Antimicrobial Susceptibility Database

[antibiotic]

The best and most simple online authoritative antimicrobial (antibiotics, antifungal, antiparasitic, antiviral and antitumor) guide in my opinion is:

The Antimicrobial Index
http://antibiotics.toku-e.com/

Most importantly it is regularly updated and it is freely available with no registration. Its packed with antimicrobial suceptilibty info in the form of minimum inhibitory concentration data.

Hope you will also find it useful