My dad has stage 7 dementia and attends adult day services...

My dad has stage 7 dementia and attends adult day services 3x a week. He lives with my mom who is is main caregiver. Problems occur in the evening. His personality changes and he becomes agitated and argumentative gets dressed and leaves the house alone. No one can stop him and its dark. He may become abusive if my mom contined to try to stop him. He becomes a like a caged animal. Is there any medication that can be given in the evening to slow him down. My mom has health issues that prevents her from walking very long. Hiring a "companion" is not the answser because he can decide to go out any time. Thanks