Medication errors involving anticoagulants: Data from the Danish patient safety database.

Reporting of adverse incidents is mandatory in Denmark. All reported adverse incidents are made anonymously, and stored in an encrypted database. It is the purpose of this descriptive study to describe the severity of adverse medication incidents caused by oral anticoagulants in hospitals. All moderate, severe and fatal reports concerning non-vitamin K antagonist oral anticoagulants were analyzed from date of marketing until July 8 2014. The data collection for warfarin was from January 1 2014 until July 8 2014. Three independent specialists in clinical pharmacology evaluated the severity of incident outcomes. A total of 147 adverse medication incidents were analyzed, and showed that de facto or potentially fatal and serious incidents were most frequently associated with sector change (admission to or discharge from hospital, or undergoing surgery) and resulted from insufficient or excess dosing. Physicians should be aware when prescribing and changing anticoagulant therapy to avoid severe or fatal incidents.