ContextRx glossary: contextual word errors in FDA DailyMed labels
A contextual word error is a correctly spelled word that is wrong for its sentence, and it is the kind of mistake spell check cannot catch. This glossary defines the terms ContextRx uses when writing about these errors in FDA DailyMed labels. Each entry gives a short definition, then one human-verified case where it happened.
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Contextual word error
A contextual word error is a real word, spelled correctly, that is wrong for the sentence it sits in. On a drug label it can change an instruction or a warning while still reading as normal English.
Example: A first-aid line said "doctor" where it needed "water" (see the case).
Correctly spelled wrong word
A correctly spelled wrong word is a valid dictionary word printed in place of the word the sentence needs. Spell check passes it because nothing is misspelled.
Example: A heart-risk warning said "attach" where it needed "attack" (see the case).
Real-word error
Real-word error is the term from spelling research for a typing or editing slip that happens to produce another real word. In labeling it is the same thing as a contextual word error, seen from how it happened rather than what it breaks.
Example: An alcohol warning said "ever" where it needed "per" (see the case).
Spellcheck blind spot
A spellcheck blind spot is any error a spelling tool cannot see because every word is in its dictionary. Homophones, near-miss swaps of a letter or two, and wrong word forms all fall into it.
Example: A directions line said "does" where it needed "dose" (see the case).
Labeling QC
Labeling QC is the review step that checks label text, artwork and proofs against the approved content before and after release. Reading for sense, not just spelling, is the part that catches contextual word errors.
Example: A safety line said "adheres" where it needed "adverse" (see the case).
Drug Facts label
The Drug Facts label is the standard panel on over-the-counter medicines that lists uses, warnings and directions in a fixed order. Its warning and direction lines are short, so one wrong word can carry the whole instruction.
Example: A warning on a Drug Facts label said "lake" where it needed "take" (see the case).
FDA DailyMed
FDA DailyMed is the public website run by the National Library of Medicine that publishes the official labeling submitted to the FDA. It is where label text goes live, and where ContextRx finds the human-verified cases on this site.
Example: A prescribing label on FDA DailyMed said "indicted" where it needed "indicated" (see the case).
Live word pairs
Each pair below is already on a live case or a signed ContextRx page. One line on what each word means, the meaning flip a swap causes, and where to read more.
does / dose
Does is the verb do; dose is a measured amount of medicine. Flip: a dosing line loses its amount and reads as a stray verb. See the case.
lake / take
Lake is a body of water; take means to swallow or use a medicine. Flip: the action a warning is about drops out of the sentence. See the case.
adheres / adverse
Adheres means sticks to; adverse means harmful. Flip: a line about harmful reactions reads as a line about sticking. See the case.
attach / attack
Attach means to fasten; an attack is a sudden medical event. Flip: the named risk in a warning stops naming anything. See the case.
doctor / water
A doctor is a physician; water is what a first-aid step uses to flush. Flip: a first-aid step tells the reader to do something else entirely. See the case.
indicted / indicated
Indicted means formally charged with a crime; indicated means recommended for a use. Flip: a use statement reads as a legal accusation. See the case.
ever / per
Per means for each; ever means at any time. Flip: a limit in a warning loses its rate. See the case.
hypotension / hypertension
Hypotension is low blood pressure; hypertension is high blood pressure. Flip: the warning names the opposite condition. See the guide.
hypoglycemia / hyperglycemia
Hypoglycemia is low blood sugar; hyperglycemia is high blood sugar. Flip: the warning names the opposite condition. See the guide.
dysphagia / dysphasia
Dysphagia is difficulty swallowing; dysphasia is difficulty using or understanding language. Flip: a swallowing problem becomes a language problem. See the guide.
ileum / ilium
The ileum is the last part of the small intestine; the ilium is a bone of the pelvis. Flip: a gut reference becomes a bone reference. See the guide.
prostate / prostrate
The prostate is a gland; prostrate means lying flat or overcome. Flip: a body part becomes a body position. See the guide.
oral / aural
Oral relates to the mouth; aural relates to the ear. Flip: the route of use changes. See the guide.
now / not
Now means at this time; not turns a statement negative. Flip: an instruction can reverse. See the guide.
dairy / daily
Dairy means milk foods; daily means each day. Flip: a schedule becomes a food. See the guide.
Sources
Last reviewed: October 14, 2026
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