engine - 5:17 pm on Nov 30, 2012 (gmt 0)

From part of Google's Knowledge Graph, it now includes medication info in the SERPs.

So to make it quick and easy for you to learn about medications, we’ll start showing key facts -- side effects, related medications, links to in-depth resources, and more -- right on the search results page. Google Adds Medication Look-Up To SERPs [insidesearch.blogspot.co.uk]

This data comes from the U.S. FDA, the National Library of Medicine, and the Department of Veterans Affairs, among others.