Potentially Inappropriate Prescribing and Potential Prescribing Omissions and Their Association with Adverse Drug Reaction-Related Hospital Admissions

Background: This study aimed to determine the prevalence of potentially inappropriate prescribing (PIP) and potential prescribing omissions (PPOs) and their association with ADR-related hospital admissions in patients aged ≥ 65 years admitted acutely to the hospital. Methods: Information on medications and morbidities was extracted from the Adverse Drug Reactions in an Ageing Population (ADAPT) cohort (N = 798: N = 361 ADR-related admissions; 437 non-ADR-related admissions). PIP and PPOs were assessed using Beers Criteria 2019 and STOPP/START version 2. Multivariable logistic regression (adjusted odds ratios (aOR), 95%CI) was used to examine the association between PIP, PPOs and ADR-related admissions, adjusting for covariates (age, gender, comorbidity, polypharmacy). Results: In total, 715 (90%; 95% CI 87–92%) patients had ≥1 Beers Criteria, 555 (70%; 95% CI 66–73%) had ≥ 1 STOPP criteria and 666 patients (83%; 95% CI 81–86%) had ≥ 1 START criteria. Being prescribed at least one Beers (aOR = 1.66, 95% CI = 1.00–2.77), or meeting STOPP (aOR = 1.07, 95% CI = 0.79–1.45) or START (aOR = 0.72; 95%CI = 0.50–1.06) criteria or the number of PIP/PPO criteria met was not significantly associated with ADR-related admissions. Patients prescribed certain drug classes (e.g., antiplatelet agents, diuretics) per individual PIP criteria were more likely to have an ADR-related admission. Conclusion: There was a high prevalence of PIP and PPOs in this cohort but no association with ADR-related admissions.