By the PharmaTradz BD Team. Published October 2026.
The same medicine often carries different brand names in different countries because a name has to clear trade mark law, the medicines regulator and the local language in every market, and one name rarely clears all three everywhere. History, licensing deals and commercial choices add more variety. What never changes is the active ingredient's international generic name, the INN. For patients and buyers alike, that name, together with the strength, the form and the local approval, is what really matters.
Why one medicine has many names
A brand name, which regulators call the proprietary name or invented name, is a commercial name that a company owns as a trade mark. The company would usually like one name worldwide. In practice, several forces pull the names apart.
The trade mark is already taken
A name has to be registered as a trade mark in each country. If a similar mark already belongs to someone else in one market, the company cannot use it there and must pick another. Even in the European Union, where a single name is the rule for medicines approved centrally, the law allows an exception for trade mark problems in a particular member state.
Regulators reject names that look or sound like existing ones
This is the reason that matters most for safety. A name that looks like another medicine's name on a handwritten prescription, or sounds like it when read out over the phone, can lead to the wrong medicine being given. Regulators call this look-alike, sound-alike risk.
In the United States, the Food and Drug Administration (FDA) reviews every proposed proprietary name. Its guidance says plainly that product names that look or sound alike can lead to medication errors and harm to patients. The FDA also checks whether a name overstates what a medicine does. In the European Union, the European Medicines Agency (EMA) has a dedicated (Invented) Name Review Group. It checks that a proposed name will not cause confusion with another medicine in print, speech or handwriting, and that it does not give a false impression of what the product is or does.
The catch is that each country already has its own list of medicines on the market. A name that is perfectly safe in Europe can clash with an established product in the US, and the other way round. Two real cases show how this plays out:
- Omeprazole. The stomach-acid medicine first reached the US market under the name Losec, the name used in many other countries. Prescribing errors with Lasix (furosemide), a water tablet, were reported, and in 1990 the FDA asked for a change. In the US it became Prilosec. In the UK it is still Losec.
- Vortioxetine. In 2016 the antidepressant was renamed from Brintellix to Trintellix in the US after reports of mix-ups with Brilinta (ticagrelor), a blood-thinning medicine. The company confirmed that the formulation, uses and doses stayed exactly the same. In the European Union it is still authorised as Brintellix.
In both cases the tablets did not change. Only the name on the box did, and only in one country.
Language and meaning
A made-up word can be neutral in one language and awkward, funny or offensive in another. It can also be hard to pronounce, which is itself a safety problem. The EMA's naming guideline, for example, warns that strings of consecutive vowels or consonants can make a name difficult to say. Companies test names across languages before launch, and sometimes the answer is a different name for a different market.
Licensing, partners and company history
Many medicines are sold in some countries by a licensing partner rather than by the company that discovered them. A partner may launch under its own name. Mergers, acquisitions and the sale of brands to other companies can also leave a medicine with different names in different regions, simply because of who owned it where and when.
Pricing and parallel trade
Parallel trade means buying a medicine in one country where it is priced lower and reselling it in another where the price is higher. Different names and packs in different countries make this harder, because the imported pack does not match what local doctors and pharmacists expect. In the European Union this has reached the courts. In 1999 the EU Court of Justice ruled on an antibiotic, clindamycin, that was sold under different trade marks in Denmark, France and Greece. The court held that a parallel importer may replace the name with the one used in the importing country where that is objectively necessary to sell the product there, but not merely to gain a commercial advantage.
Reformulations and local line extensions
Sometimes a different name really does signal a different product. A company may launch a slow-release version, a new strength, a combination with a second ingredient or a children's syrup under a related but distinct name, and these line extensions are not launched everywhere at once. This is why a familiar-looking brand abroad deserves a careful look rather than an assumption.
The name that never changes: the INN
Every active ingredient has a generic name chosen by the World Health Organization (WHO) through its International Nonproprietary Names programme. In the WHO's own words, each INN is a unique name that is globally recognised and is public property. No company can own it as a trade mark. Vortioxetine is vortioxetine whether the box says Brintellix or Trintellix. Omeprazole is omeprazole whether it says Losec or Prilosec.
The WHO also asks that brand names should not be built from INNs or their word stems, so that the generic name stays clear. The EMA applies this when it reviews names.
There is one complication. A few countries kept their own official names for older medicines, and the US is the most familiar case. Its official names, called United States Adopted Names (USAN) and the names in the US Pharmacopeia (USP), differ from the INN for some common medicines. The UK moved almost entirely to INNs in 2003 and 2004, but kept adrenaline and noradrenaline on public health grounds, with labels encouraged to show both names. The table below shows the pairs you are most likely to meet.
| Name used in the UK and Europe | Name used in the US | Which is the international name? | What changes |
|---|---|---|---|
| Paracetamol | Acetaminophen | Paracetamol is the INN; acetaminophen is the US name (Japan also uses it) | Only the name. Same pain and fever medicine. |
| Salbutamol | Albuterol | Salbutamol is the INN; albuterol is the USAN | Only the name. Same reliever medicine used in asthma inhalers. |
| Adrenaline | Epinephrine | Epinephrine is the INN; the UK and the European Pharmacopoeia use adrenaline | Only the name. Same emergency medicine for severe allergic reactions. |
| Glyceryl trinitrate (GTN) | Nitroglycerin | The European Pharmacopoeia uses glyceryl trinitrate; the US Pharmacopeia uses nitroglycerin | Only the name. Same medicine for angina chest pain. |
A US label that says acetaminophen and a UK label that says paracetamol describe the same active ingredient.
What should matter to patients
Picture this. You are on holiday and realise you have packed too few of your usual blood pressure tablets. The pharmacy near your hotel has never heard of the brand on your box. That does not mean the medicine is unavailable. It usually means you need to talk in generic names. A pharmacist can then check what is approved locally and what is suitable for you.
When comparing your medicine with one sold abroad, these are the things that matter, in roughly this order:
- Active ingredient. Look for the INN on the pack, usually in smaller print under the brand name.
- Strength. The amount of active ingredient per tablet, capsule or dose, such as 20 mg.
- Dosage form. Tablet, capsule, liquid, inhaler, patch or injection.
- Release type. Immediate release works quickly; modified or extended release spreads the dose over many hours. They are not interchangeable without advice. Our guide to IR, ER, DR and CR release explains the labels.
- Salt. Some medicines come as different salts, such as a hydrochloride. The salt can change how much active ingredient each tablet delivers. See hydrochloride vs base for why this matters.
- Excipients and allergens. The inactive ingredients, such as lactose, starches, colourings or preservatives, can differ between countries. This matters if you have an allergy or intolerance.
- Local approval. A medicine approved by the local regulator has been assessed for that market. Buy only from a licensed pharmacy.
- Pharmacist or doctor advice. They can confirm whether a local product is a suitable match and tell you if anything about the dose needs to change.
A few habits make travel much easier. Ask your prescriber for a letter or a copy of your prescription that lists each medicine by its generic name, strength and dose. UK travel health guidance recommends exactly this, both for border checks and in case a medicine needs replacing. Take enough supply for the whole trip, keep medicines in their original packs, and check the destination's rules on bringing medicines in before you travel, through the embassy or official travel advice.
One warning deserves its own line. Never assume that a similar-looking name is the same medicine. The Losec and Lasix story shows how two quite different medicines can look alike on paper. A brand you recognise may also contain a different ingredient or combination in another country. If in doubt, ask.
What buyers should do
Now picture the trade version. An importer sends a request for quotation, or RFQ, that names only a US brand. A supplier in Europe knows the product under another name and does not recognise the request, or quotes the wrong strength. Days are lost.
The fix is to write every RFQ in generic terms first:
- INN, plus the US or local name where it differs, for example "salbutamol (albuterol)".
- Salt form and strength, stated the same way the pack states it.
- Dosage form and release type, for example "gastro-resistant capsule" or "extended-release tablet".
- Pack size and presentation, such as blister strips of 10 or bottles of 100.
- Pharmacopoeia, the official book of quality standards the product must meet, such as the US Pharmacopeia (USP), the European Pharmacopoeia (Ph. Eur.) or the British Pharmacopoeia (BP).
- Brand, only if you genuinely need the originator product, and then say which country's version.
Then check the paperwork. Ask for the Certificate of a Pharmaceutical Product (CoPP), the WHO-format certificate issued by the exporting country's regulator. It confirms the product's approval status and the name it is approved under there. Compare that name, the INN and the composition with your own registration or tender documents.
Finally, watch for look-alike names in your own systems. If your catalogue lists two products whose names differ by a letter or two, flag them clearly.
How PharmaTradz can help
PharmaTradz connects buyers with verified pharmaceutical suppliers worldwide, and we work in generic names by default. Tell us the INN, strength, form and standard you need, and we will match it to products that fit, whatever they are called locally.
- Post your requirement through the PharmaTradz RFQ form.
- Use our guide on how to write a pharmaceutical RFQ that gets quoted fast.
- Learn how importers use the CoPP to confirm approval status.
- Find each country's regulator and product register in Drug Regulatory Authorities of the World.
- Working across languages? Our pharma trade glossary in six languages helps.
Brand names mentioned are trademarks of their owners and are used only to identify the medicine.
Frequently Asked Questions(FAQs)
Why are drug names different in different countries?
A brand name has to be available as a trade mark, approved by each country's regulator and workable in the local language. A name that clashes with an existing medicine, or looks or sounds like one, can be refused. Licensing deals and company history add more variation. The active ingredient's international generic name (INN) stays the same.
Is paracetamol the same as acetaminophen?
Yes. Paracetamol is the international nonproprietary name used in the UK, Europe and most of the world. Acetaminophen is the official name for the same active ingredient in the United States, and it is also used in Japan. Always check the strength and the other ingredients on the pack, because some products combine it with other medicines.
How do I find my medicine abroad?
Show a local pharmacist the generic name, strength and form of your medicine, ideally on a prescription or a letter from your doctor. They can tell you what is approved locally and whether it is a suitable match. Before you travel, take enough supply and check the destination's rules on bringing medicines in.
Are brand-name medicines the same in every country?
Often the active ingredient is the same, but not always everything else. The strength, release type, salt or inactive ingredients can differ, and a familiar brand name may be used for a different product or combination elsewhere. Compare the generic name and details on the pack, and ask a pharmacist if you are unsure.
What is an INN?
An International Nonproprietary Name is the generic name of an active ingredient, chosen through the World Health Organization's INN programme. Each INN is unique, recognised worldwide and public property, so no company can own it. Using the INN on prescriptions, travel letters and purchase requests avoids confusion between brand names.
