This code system http://hl7.org/fhir/CodeSystem/medicationknowledge-status defines the following codes:

CodeDisplayDefinition
active ActiveThe medication referred to by this MedicationKnowledge is in active use within the drug database or inventory system.
entered-in-error Entered in ErrorThe medication referred to by this MedicationKnowledge was entered in error within the drug database or inventory system.
inactive InactiveThe medication referred to by this MedicationKnowledge is not in active use within the drug database or inventory system.
<status value="active"/><experimental value="false"/><description value="MedicationKnowledge Status Codes"/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/medicationknowledge-status"/><content value="complete"/><concept><code value="active"/><display value="Active"/><definition value="The medication referred to by this MedicationKnowledge is in active use within the drug database or inventory system."/></concept><concept><code value="entered-in-error"/><display value="Entered in Error"/><definition value="The medication referred to by this MedicationKnowledge was entered in error within the drug database or inventory system."/></concept><concept><code value="inactive"/><display value="Inactive"/><definition value="The medication referred to by this MedicationKnowledge is not in active use within the drug database or inventory system."/></concept></CodeSystem>