part of drug prescription prescription de médicaments drug dispensing specification spécification de distribution de médicament prescription drug dispensing specification '12 x 30 tablets' in the drug administration and dispensing specification 'Aspirin 81 mg tablet PO DIE 12 x 30 tablets' written on a prescription by Dr. Jones to Mr. Fiennes. A drug dispensing specification that is part of a prescription and authorizes the dispensing of a drug product under certain conditions, and usually specifies how much of the drug is to be dispensed at a time and how many times in total. drug administration prescription item