A consultant pharmacist is performing a monthly Medication Regimen Review (MRR) for an 82-year-old resident of a long-term care facility.
The resident was recently treated for a UTI and now complains of new-onset dizziness and confusion.
The pharmacist notes a new prescription for oxybutynin for urinary incontinence.
Which of the following medication-related problems is the MOST likely cause of the resident's new symptoms?