This case-sensitive code system Changed:http://terminology.hl7.org/CodeSystem/medication-admin-status defines the following codes:

Code	Display	Definition
in-progress	In Progress	The administration has started but has not yet completed.
Added: not-done	Not Done	The administration was terminated prior to any impact on the subject (though preparatory actions may have been taken)
on-hold	On Hold	Changed:Actions implied by the administration have been temporarily halted, but are expected to continue later. May also be called 'suspended'.
completed	Completed	All actions that are implied by the administration have occurred.
entered-in-error	Changed:Entered-in-Error	The administration was entered in error and therefore nullified.
stopped	Stopped	Actions implied by the administration have been permanently halted, before all of them occurred.
unknown	Unknown	Changed:The authoring system does not know which of the status values currently applies for this request. Note: This concept is not to be used for 'other' - one of the listed statuses is presumed to apply, it's just not known which one.