Which wrong words in Dosage and Administration can change a dose?

In our view, the highest-risk words in Dosage and Administration are the ones that set the dose: frequency and interval words, route words, units, and the conditions for changing a dose. 21 CFR 201.57 says the section must state the recommended dose and, as appropriate, intervals, dose limits and dose changes for special groups, so a correctly spelled wrong word in one of those slots can change what a patient gets. Spellcheck passes it.

This page is general information, not legal or regulatory advice.

For a short entry on this section alongside the others, see how to proofread a drug label for meaning, section by section. This page goes deeper.

What the section must cover

21 CFR 201.57 says this section must state the recommended dose and, as appropriate, items such as the dosage range, an upper limit, dosages for each indication and subpopulation, the intervals recommended between doses, and modification of dosage needed because of drug interactions or in special patient populations.

The FDA's draft guidance on this section, issued in January 2023 and marked not for implementation, recommends presenting the information in a clear, concise manner, using active voice and command language whenever possible. It says the most clinically relevant information should generally appear first, such as the recommended dosage for each indication and subpopulation and the route of administration.

The high-risk words

Our view: a few kinds of word carry the dose.

• Frequency and interval words. How often, and how long between doses.
• Route words. How the drug goes in.
• Units. What the number means. A correct number with the wrong unit word is a wrong dose.
• Adjustment conditions. Which patients get a different dose, and when.

Made-up example: an administration line that should say "oral" (by mouth) prints "aural" (by ear). The line still reads as a normal instruction, and the route has changed.

Why spellcheck misses it

Both words are real and spelled correctly, so spellcheck passes them. A compare-to-master check passes them too if the master carries the same word. See compare-to-master vs read-for-meaning.

Reading the section against the rest of the label

Practice advice:

• Read each dosing line as an instruction a clinician would follow, then ask whether that is what was intended.
• Check that the dose, interval and route in Highlights say the same thing as this section.
• Check that patient labeling describes the same dose and route in plain words.
• Read adjustment conditions for the patient group named, not only the number.
• For opposites and near-twins to watch for, see confusable clinical terms.

This is our reading of public guidance, not legal or regulatory advice.

Sources

• eCFR: 21 CFR 201.57
• FDA draft guidance: Dosage and Administration Section of Labeling for Human Prescription Drug and Biological Products — Content and Format

Last reviewed: October 18, 2026

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What goes in the Dosage and Administration section?

21 CFR 201.57 says it must state the recommended dose and, as appropriate, items such as the dosage range, intervals between doses, and dose changes for drug interactions or special patient populations.

Which words matter most in Dosage and Administration?

In our view: frequency and interval words, route words, units, and the conditions for changing a dose.

Can a frequency word error change a patient's dose?

Yes. If a frequency or interval word is swapped for another real word, the line can still read normally while giving a different dose.

Does compare-to-master catch a dosing word error?

Only if the master is correct. Read the section for meaning too.

How should I proofread Dosage and Administration?

Practice advice: read each line as an instruction, then check it against Highlights and patient labeling for the same dose, interval and route.