The Roman numeral is essential in pharmacy due to its efficiency in its shorthand notations. Some prescription medications are controlled which can be classified as a CIII-V or CII substance. These controlled substances are often notated with the letter C (for controlled) followed by a Roman numeral. CII substances include oxycodone, hydrocodone, codeine, morphine, fentanyl, Vyvanse, amphetamine; these medications are HIGHLY addictive.
Roman numerals were used as a short form in the prescriptions to provide dosing instructions and how to take the medications etc. However with the increasing use of electronic prescriptions, the use of roman numerals may be declining