Your Prosearch tool has a "Vulnerable for non-use" indicator feature that allows quickly assessing whether it is worth further investigating the usage for certain trademarks of concern.
It is not enabled in all accounts by default, but you can adjust displaying of this option via the View options/ Custom columns:
You will see a "YES" indicator once a trademark in a given country reaches the point where it can be challenged for non-use, based on the applicable timeframe and the local rules.
Please keep in mind that the actual usage should still be verified additionally.
One of the useful tips we can give you is doing a quick google search via your full records page:
Moreover, for Pharma-related data Markify has Pharma-in-use database which can give you additional insights for the products actively sold.