Over my career, I and other clinicians have often assumed the side effects of a medication represent a subtle new disease which commonly leads to more tests and more medications, resulting in a prescribing cascade which can be quite harmful. At a CALTCM meeting in the early 1990’s (we were then called The California Association of Medical Directors) , I had the privilege of attending a presentation by Dr. Mark Beers on “Potentially Inappropriate Medications” (PIMS) in older adults. This list became known as the Beers List. After his untimely death in 2009 the AGS (American Geriatrics Society) began updating the criteria for PIMS about every 4 years with the last update released in May 2023. A summary table can be found at: https://www.guidelinecentral.com/guideline/340784/