Medication problems don’t always present as a clearly “wrong pill” situation. Common patterns we see in real cases include:
- Label and instructions mismatch: The bottle says one thing, but the discharge instructions or follow-up plan says another.
- Dose confusion after a transition of care: Medication lists can change after hospital discharge, specialty visits, or urgent care—sometimes without a clean reconciliation.
- Pharmacy substitution issues: A different brand or formulation may be provided, and the strength or dosing schedule may not be communicated clearly.
- Missed interaction or allergy warnings: Errors happen when systems don’t catch risks or when those warnings aren’t properly acted on.
- Automation/records problems: Electronic prescribing and charting can carry forward incorrect information, especially when updates are delayed.
In Cambridge, the practical challenge is that patients often travel between care settings. If the error occurred in one place, but the harm showed up after a follow-up elsewhere, the documentation needs to be pieced together carefully.


