In particular, factors that can be used to identify those at increased risk of hospitalization for delirium or dementia included a prior history of behavioral disturbances (such as aggression, irritability, anger, restlessness and agitation), use of monoamine oxidase B inhibitors, use of DPP‐4 inhibitors, exposure to a high sedative load, use of benzodiazepines, use of antipsychotics, frequent GP and geriatric medicine attendances. Here, DPP4 is linked to delirium.