Conclusions
The proportions of patients taking any PIMs and/or PPOs were significantly reduced from acute admission to geriatric rehabilitation discharge. Neither PIM, nor PPO use at geriatric rehabilitation discharge were consistently associated with an increased risk of unplanned readmission and mortality. However, the number of discharge medications were strongly associated with short and long-term readmission. The use and number of PPOs that included vaccine omissions were negatively associated with the longitudinal gains in IADL scores at 90-days following geriatric rehabilitation discharge. Interventions toward patient-tailored appropriate (de) prescribing in geriatric rehabilitation patients are needed, taking the number of medications, unnecessary and omitted medications into account.