From the NLM Technical Bulletin:
The PubMed Summary results page [now shows] results from other high-quality resources in a column to the right of the PubMed search results.
The first example of this new feature will be the Drug Sensor developed at the National Center for Biotechnology Information (NCBI). This sensor detects whether a drug name is present in a user’s search, and if so, presents exerpts of information from other resources that you can link to to read more. The summary consists of a title (created from the drug name in the search query), some content from the linked resource, and an attribution line. At this time, about 200 drug names are included.
Source: NLM Tech Bulletin
