Since the National Partnership to Improve Dementia Care debuted in 2012 with the goal to reduce antipsychotic use in individuals with Alzheimer’s disease and/or Alzheimer’s-related dementias (AD/ADRD), CMS has scrutinized almost all associated long-stay psychoactive prescribing. While the long-stay use of these monitored psychoactive drugs has declined, prescriptions of mood-stabilizing antiepileptic drugs (AEDs) have increased. Similar to antipsychotics, mood stabilizing AEDs are used to treat the behavioral and psychological symptoms of dementia (BPSD) in the AD/ADRD population. Unlike antipsychotics and other psychoactive medications, AEDs prescribed in nursing homes are not mandatorily reported to CMS. Pilot studies suggest AED increases are concentrated entirely in AD/ADRD and other dementia patients with no diagnosis of epilepsy and purposefully prescribed for BPSD as an unmonitored alternative to antipsychotics. AEDs are not approved to treat AD/ADRD or any dementia symptoms, have weak efficacy evidence, and convey serious risk. Increasingly, the Partnership’s debut seems an inflection point where the trend toward unmonitored alternative drugs for AD/ADRD symptoms sharply increased. Furthermore, initial findings hint that the COVID pandemic represents a second critical point of inflection where the existing transition toward non-superior but unreported drugs for AD/ADRD is again rapidly accelerating. All outcomes associated with this evolving pre-scribing phenomenon remain unknown, though early data warns that harms may be increasing without benefit. We propose a retrospective analysis detailing long-stay prescribing of all psychoactives, including AEDs, for AD/ADRD and other conditions, how such prescribing is changing under the combined pressures of the pandemic and targeted reduction efforts, and the role of such prescribing in adverse health outcomes. We will accomplish this by creating a detailed dataset of quarterly cohorts of nursing home residents, including those with AD/ADRD, for the years 2009-2021 that draws on elements linked at an individual level from CMS’s Minimum Data Set (MDS), Part D, MedPAR, and Public Use files. The final linked dataset will include health, demographic, cognitive, and diagnostic variables, all psychoactive drug claims, nursing home outcomes, records of hospital and ER adverse events, and long-stay facility details, including staffing resources and COVID statistics. Finally, to help explain and validate findings, a national sampling of nursing home prescribers will be surveyed regarding their knowledge and beliefs surrounding changing approaches to the care of AD/ ADRD and associated outcomes. This study will describe current and evolving AED use in nursing homes for all indications, focusing on AD/ADRD and AD/ADRD outcomes. It will describe racial and gender disparities in the long-stay populations treated or not treated with psychoactives. It will delineate the impact of the COVID pandemic in combinat...