I have a question on what can be done if you know someone is over medicating an older man that is starting to get dementa ?

If you suspect elder abuse, you can call the local County Board of Social Services and ask for the Adult Protective Services department.  You can make an anonymous report about suspected elder abuse, and they will do an investigation.  Elder Abuse is also a crime, and if you are very concerned, contact your local police department and they may put you in touch with the County Prosecutor.  If the person lives in Ocean County, there is a special prosecutor assigned to Elder Fraud and Abuse cases.  Other counties most likely have a similar department.