7 Medical Terminology Pitfalls in Pharmaceutical Translation

5 MIN READ

Updated October 12, 2026

In a pharmaceutical text, one wrong term can change a dose, a route of administration or a safety warning. That’s why pharmaceutical translation services work from controlled vocabularies and approved templates, not just good dictionaries. Below are the seven terminology pitfalls translators meet most often in labels, package leaflets, clinical trial documents and safety reports, with real examples and how to avoid each one.

Pitfall 1: Mixing Up Drug Names

A medicine can have three names: a generic name, a brand name and a chemical name. They aren’t interchangeable.

• The same active substance is called paracetamol (the WHO International Nonproprietary Name, INN) in most countries and acetaminophen in the US.
• Brand names differ from country to country: the same paracetamol is sold as Tylenol in the US and Panadol in many other markets.
• Chemical names, such as acetylsalicylic acid for aspirin, belong in chemistry and manufacturing documents, not on patient leaflets.

How to avoid it: use the INN for the active substance, the approved brand name for that specific market, and the chemical name only where the source uses it.

Pitfall 2: Dosing Abbreviations and Schedules

• Latin abbreviations such as “q.d.” (once daily) are easily misread as “q.i.d.” (four times a day). The US Institute for Safe Medication Practices lists them as error-prone.
• Dosing schedules are written differently around the world. German prescriptions often use “1-0-1”, meaning one dose in the morning, none at midday and one in the evening, which an English-speaking reader may not understand.

How to avoid it: write dosing instructions out in full in the target language, such as “twice daily, morning and evening”, instead of copying abbreviations.

Pitfall 3: Units, Decimals and Trailing Zeros

• µg (micrograms) can be misread as mg (milligrams), a thousandfold difference. “mcg” or the word “micrograms” is safer.
• Many languages use a decimal comma, so 1,5 mg in German or Spanish is 1.5 mg in English.
• A trailing zero is dangerous: “5.0 mg” can be read as 50 mg if the decimal point is missed. Write “5 mg”.

How to avoid it: never change a value, adapt only the number format to the target language, and check every number against the source.

Pitfall 4: Dosage Forms and Routes of Administration

“Tablet”, “film-coated tablet” and “prolonged-release tablet” are different products, and “sublingual” (under the tongue) isn’t the same as “buccal” (against the cheek). In the EU, dosage forms and routes in official product information must use EDQM Standard Terms, which exist in every official EU language.

How to avoid it: take dosage forms and routes from the official standard terms list, not from a general dictionary.

Pitfall 5: Adverse Event Terms

In safety reports and clinical study reports, adverse events must use MedDRA, the Medical Dictionary for Regulatory Activities. Words that look similar have different MedDRA terms: “dizziness” and “vertigo” are coded differently. A freely translated term won’t match the code in the safety database, and the report can be queried or rejected.

How to avoid it: use the MedDRA term in the target language, never a synonym.

Pitfall 6: Side-Effect Frequency Labels

EU package leaflets and SmPCs describe how often side effects happen with fixed categories:

• very common (more than 1 in 10 people)
• common (up to 1 in 10)
• uncommon (up to 1 in 100)
• rare (up to 1 in 1,000)
• very rare (up to 1 in 10,000)

Each language has an approved wording for these categories in the EMA QRD templates. Translating “common” with an everyday word changes the meaning for the patient.

How to avoid it: use the QRD template wording for each language exactly as published.

Pitfall 7: False Friends and Patient Readability

• Spanish “constipado” means “having a cold”, not “constipated”.
• In French, “médicament” means medicine, but “drogue” means an illegal drug, so “drug” can’t be translated word for word.
• Package leaflets are written for patients, not doctors. In the EU, the leaflet must be tested with patients for readability, so a technically correct but hard-to-read translation can still fail.

How to avoid it: use translators who know medical usage in the target country, and write patient texts in plain language.

How Professional Translators Avoid These Pitfalls

• A termbase built from the client’s approved labels and the official sources: WHO INNs, MedDRA, EDQM Standard Terms and QRD templates.
• Translators with pharmaceutical qualifications, such as pharmacy or medicinal chemistry.
• A second linguist with pharmaceutical expertise who checks every term, number and unit against the source.
• Back translation for informed consent forms and patient questionnaires when an ethics committee or sponsor requires it.

TheWordPoint’s pharmaceutical translation follows this process for labels, SmPCs, clinical trial documents and pharmacovigilance reports in 80+ languages.

Pharmaceutical Terminology: Frequently Asked Questions

What is an INN?
An International Nonproprietary Name is the generic name of an active substance, set by the World Health Organization, such as paracetamol or amoxicillin. It’s used on labels in all markets, next to the brand name.

What is MedDRA used for?
MedDRA is the standard dictionary for coding adverse events in clinical trials and safety reports. Translated reports must use MedDRA terms in the target language so they match regulatory databases.

Can machine translation handle pharmaceutical texts?
Not on its own. It doesn’t know which term is approved in a specific market, and errors in doses or units are dangerous. Machine output must be fully post-edited by a pharmaceutical translator.

How much does pharmaceutical translation cost?
At TheWordPoint, pharmaceutical translation starts at $0.09 per word, and enterprise projects with a personal account manager start at $0.12 per word.