drug co-administration A planned process of administering more than one drug to the same individual over a specific time interval. An instance of this occurs when at least two or more drugs are taken in a specific time interval and the individual time interval for each drug administration overlaps with the other drug's or drugs' time interval(s). (SG1) This class currently does not have a restriction. One candidate restriction is a necessary condition: 'has participant at some time' min 2 'drug product'. I was not able to find an OWL reasoner for Protege 5 that supports cardinality restrictions. planned process