Zanapezil is primarily used in the treatment of Alzheimer's disease, where it helps to improve cognitive function by inhibiting the breakdown of acetylcholine, a neurotransmitter crucial for memory and learning. It is often prescribed to manage symptoms such as memory loss, confusion, and difficulties with thinking and reasoning. Additionally, Zanapezil may be utilized in other conditions involving cognitive impairment, offering potential benefits in enhancing mental clarity and daily functioning for patients.