1-27. ROMAN NUMERALS
a. Roman numerals are sometimes used in place of Arabic numbers on a
prescription to designate the number of tablets or the number of fluid ounces of a liquid
to be dispensed. For example:
b. In the above prescription, the Roman numeral XXXII as written below the
dosage form (aspirin tablets-5 gr) indicates the number of tablets to be dispensed.
Roman numerals may also be used in the signa of a prescription to indicate the number
of tablets to be taken as a single dose. In the prescription above, the Roman numeral ii
in the signa indicates the number of tablets to be taken as a single dose.
In the above prescription, the Roman numeral IV following the symbol for a fluid
ounce (f ) indicates that four fluid ounces of calamine lotion should be dispensed.
1-28. VALUES OF SINGLE NUMERALS
ss or ss = 1/2
I or i
V or v
X or x