IANAD but I think it means no food in your stomach when you take your meds. Since it can take a while to move food through your digestive system I would think that no food in the past 4-6 hours would constitute an empty stomach.
The population within the borough limits was 10,568 at the 2010 census. When combined with the surrounding Washington and Quincy Townships, the population of greater Waynesboro is 28,285. The Waynesboro Area School District serves a resident population of 32,386, according to 2010 federal census data.
Pennsboro is a city in Ritchie County, West Virginia, United States. The population was 1,171 at the 2010 census. The city is located at the junction of U.S. Route 50 and West Virginia Route 74; the North Bend Rail Trail also passes through the city.[6]