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Related to leading zero: Trailing zero
A zero that precedes a decimal point, e.g., as in “levothyroxine 0.05 mg p.o. daily.” Leading zeros should always be employed when writing prescriptions for doses of drugs that are fractions of a unit. In the example above an alternative method of writing the drug dose without decimals is “levothyroxine 50 µg p.o. daily.”
See also: zero