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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.
All you can do now is to provide Google with informational sites they can scrape.
Thing > MedicalEntity > MedicalIntangible > MedicalEnumeration > MedicineSystem >
Having done a lot of medicine searches in my time, I know how hard it is to find all this information in one place, so the top level "collection" that Google offers is a real service to the end user.