Therapeutic Errors Associated With Antithrombotic Medications Reported to United States Poison Centers

The objective of this study was to investigate the characteristics and trends of therapeutic errors in non-healthcare facility settings associated with antithrombotic medications reported to United States Poison Centers by analyzing data from the National Poison Data System from 2000 to 2021. There were 57 288 reported therapeutic error-related exposures involving antithrombotic medications as the primary substance. The rate of therapeutic errors increased by 590.9% during this 22-year period. Although most (90.1%) therapeutic errors were clinically inconsequential and did not receive treatment at a healthcare facility, 2.3% were medically admitted, and 2.1% experienced a serious medical outcome, including 16 fatalities. Three-fourths (74.9%) of therapeutic errors were among > 59-year-olds, and females represented 58.0% of exposures. Warfarin was the most commonly involved antithrombotic medication (37.5%), followed by direct oral anticoagulants (DOACs, 28.7%) and clopidogrel (23.3%). Therapeutic errors involving warfarin were more likely to be associated with a medical admission (odds ratio [OR] = 2.23; 95% confidence interval [CI]: 1.99-2.49) or a serious medical outcome (OR = 2.99; 95% CI: 2.65-3.37), and DOACs were less likely to be associated with a medical admission (OR = 0.53, 95% CI: 0.46-0.61) or a serious medical outcome (OR = 0.45; 95% CI: 0.38-0.53) than therapeutic errors involving other antithrombotic medications. The rate of therapeutic errors involving warfarin significantly increased by 187.0% during 2000-2011, followed by a 57.6% significant decrease during 2011-2021. The rate of therapeutic errors involving DOACs increased significantly by 1118.2% during 2011-2021. The scenario "inadvertently took/given medication twice" accounted for 56.3% of all therapeutic errors. Increased risk reduction efforts are needed to prevent antithrombotic-related therapeutic errors.