This study investigates the long-term safety and tolerability of an investigational medication used alongside donepezil in individuals with mild to moderate Alzheimer's disease. Alzheimer's disease is a brain disorder that slowly destroys memory and thinking skills. The study aims to understand how well patients can tolerate this additional treatment over an extended period.

Participants in the study will receive the investigational medication in addition to their regular donepezil treatment. The study is designed as an open-label extension, meaning all participants will know they are receiving the investigational medication. The focus is on monitoring the safety and any side effects experienced by the participants.

• Who can participate: The study is open to individuals diagnosed with mild to moderate Alzheimer's disease who are currently being treated with donepezil. Participants must be able to understand and comply with study procedures. Age criteria apply; please contact the study team for specifics.
• Study details: Participants will continue their regular donepezil treatment and also take the investigational medication. The study will focus on observing any side effects and overall safety of the treatment.