Do you only look at newly made drugs or do you look at existing one, as well, to see if you can learn anything new

Question: Do you only look at newly made drugs or do you look at existing one, as well, to see if you can learn anything new about them?
- Keywords:
  drug,
  experiment,
  work
Asked by Lottie to Josh on 17 Jun 2015.
- Josh Meyers answered on 17 Jun 2015:
  
  You obviously have good experimental reasoning.
  
  The majority of the research that I do focuses on existing data published in scientific journals. There is a large amount of data in the public domain these days which allows for very powerful retrospective analyses. By analysing old compounds, we can make the road to finding new drugs shorter, cheaper and more efficient!

Question: Do you only look at newly made drugs or do you look at existing one, as well, to see if you can learn anything new about them?