Can a wrong word in Contraindications change who shouldn't take a drug?

Yes. Contraindications lists the situations where a drug should not be used because the risk clearly outweighs any possible therapeutic benefit, so a correctly spelled wrong word can flip which patients are protected. A clinical opposite that looks almost the same, such as hypotension for hypertension, or a dropped negation, still reads as a normal line, and 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 belongs in Contraindications

21 CFR 201.57 says this section must describe any situations in which the drug should not be used because the risk of use clearly outweighs any possible therapeutic benefit. It says known hazards and not theoretical possibilities must be listed, and if no contraindications are known, the section must say so.

The FDA's guidance, finalized in October 2011, says contraindications should be worded using precise language, and recommends an introductory statement followed by a bulleted list when there is more than one.

Opposites that look alike

Made-up example: a contraindication that should name patients with "hypotension" (low blood pressure) prints "hypertension" (high blood pressure). The line is precise, bulleted and grammatical, and it names the opposite group.

The same risk applies to other textbook opposites. See confusable clinical terms, and for everyday words that flip meaning, everyday word swaps.

Negations and conditions

Our view: the condition in each line is the whole point. Read each condition word alone and ask whether it names the intended patients. Where a line uses a negation or an exception, read it with and without that word, because dropping it turns a restriction into permission.

Why spellcheck misses it

Both words are real and spelled correctly, so spellcheck passes them. A check that the section is present and bulleted won't catch them either.

Reading against Highlights and patient labeling

Practice advice:

• Read each contraindication as a rule about who must not get the drug, then confirm it names the intended patients.
• Check that Highlights lists the same contraindications in the same terms.
• Check that patient labeling describes the same groups in plain words.
• Check that each contraindication matches the detailed warning it is tied to, if there is one.

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

Sources

• eCFR: 21 CFR 201.57
• FDA guidance: Warnings and Precautions, Contraindications, and Boxed Warning Sections of Labeling for Human Prescription Drug and Biological Products — Content and Format

Last reviewed: October 18, 2026

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What is the Contraindications section?

The section that describes situations where the drug should not be used because the risk of use clearly outweighs any possible therapeutic benefit.

Can one wrong word flip a contraindication?

Yes. Clinical opposites like hypotension and hypertension look almost the same, and both are real words.

How do I check Contraindications for meaning?

Practice advice: read each line as a rule about who must not get the drug, and confirm it names the intended patients.

Can a wrong word in Contraindications endanger patients?

In our view, yes. A swapped condition word can leave the intended patients unnamed and name others instead.