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.
According to our research of Virginia and other state lists there were 78 registered sex offenders living in Waynesboro, Virginia as of April 20, 2017. The ratio of number of residents in Waynesboro to the number of sex offenders is 271 to 1. Nearest city with pop. 50,000+: Lynchburg, VA (48.5 miles , pop. 65,269).