This study is testing a new treatment, KarXT + KarX-EC, for people with memory and thinking problems caused by Alzheimer's disease. Alzheimer's is a brain disease that makes it hard to remember things and think clearly. This study is for people in the mild to moderate stages of the disease. Participants need a caregiver who can help them during the study and attend visits with them. They also need to have been taking certain Alzheimer's medicines steadily for at least 12 weeks.

Some people cannot join the study, like those with other serious mental health issues or liver problems. If you've been treated with certain Alzheimer's drugs recently or have specific brain scan findings, you might not be eligible either.

• The study requires several visits and ongoing participation.
• Participants must have a caregiver to assist during the study.
• Stable medication use is necessary for those already on Alzheimer's drugs.