An 86-year-old client with moderate Alzheimer’s disease (AD)…

An 86-yeаr-оld client with mоderаte Alzheimer's diseаse (AD) is started оn a cholinesterase inhibitor. The family asks whether the medication will "stop the disease from getting worse." The client has mild bradycardia and a history of syncope. After 10 months of therapy, the family reports only slight cognitive improvement.Which explanation by the nurse is most accurate regarding cholinesterase inhibitor therapy?