Polypharmacy interaction failures when elderly patients see 4+ specialists with unlinked EHR systems

Patients aged 75+ taking 12-20 medications prescribed by 4-7 different specialists experience dangerous drug-drug interactions because no single provider has a complete, real-time medication list. So what? The most common failure mode is a cardiologist prescribing amiodarone while a psychiatrist has the patient on sertraline, causing QT prolongation and potentially fatal cardiac arrhythmia, which presents as a 'fall' or 'sudden decline' rather than being identified as an iatrogenic event. So what? Families and primary care physicians attribute the decline to 'old age' or disease progression, never identifying the medication interaction, so the dangerous combination continues. So what? Emergency department visits for adverse drug events in patients 65+ cost $7.5 billion annually, but fewer than 15% are correctly coded as medication-related, meaning the problem is systematically undercounted in quality metrics. So what? Because it's undercounted, health systems don't invest in cross-system medication reconciliation, and pharmacists at retail chains only see prescriptions filled at their own pharmacy. So what? The patient's adult children — who are often the actual medication managers — are left to manually reconcile pill bottles from CVS, Walgreens, and mail-order pharmacies using a handwritten list, with zero clinical training to identify interactions. This persists because EHR interoperability through FHIR standards covers ~60% of systems but medication reconciliation requires real-time bidirectional sync that most health systems haven't implemented, pharmacy benefit managers operate on separate data infrastructure from EHRs, and the pharmacist's legal liability for catching interactions doesn't extend to medications filled at competing pharmacies.