Indiana State Police say a Silver Alert has been issued for an elderly man from Fort Wayne.
Runyen, who also is being treated for hypertension, is white; 5 feet, 9 inches tall; weighs 275 pounds and has a large frame.
Robert Runyen, 78, was last seen August 6 at 9 a.m.
Fort Wayne Police spokesman Michael Joyner said Runyen was last seen around 9 a.m. Sunday driving his Buick Le Sabre southbound on Interstate 69 near the US 24/Jefferson Boulevard interchange on his way home to Maroa, Illinois.
A Maroa man reported missing after failing to return home from a trip to IN has been found IN Ohio.
Runyen may be confused and require immediate medical assistance, police said.
If you have any information on Robert Runyen, contact the Fort Wayne Police Department 260-427-2213 or 911.