Thanks, C, for getting the ball rolling. You know what's strange is that on that page they classify it as an "antibiotic." If you do a google search on 'antibiotic' the first result is the Wiki entry for 'antibacterial.' A couple of clicks and you realize that there is no Wiki page for the noun 'antibiotic(s).' It redirects you to 'antibacterial.' http://en.wikipedia.org/w/index.php?title=Antibiotic&redirect=no
So apparently we're playing with a couple of different dictionaries.
That got me to thinking, who's behind Drugs.com? They're definitely pharma-friendly. Don't know what it means but their "About" page says this: "The Drugs.com website is owned and operated by the Drugsite Trust. The Drugsite Trust is a privately held Trust administered by two New Zealand Pharmacists."
About a week ago I found a site that claimed Nystatin was antibacterial. If I have the time I'll try and track that down. I'm guessing the answer is that it is "somewhat" or "slightly" antibacterial...