You are at a pharmacy in a new country, you ask for the medicine you have taken for years, and the pharmacist looks blank. The brand name on your box at home means nothing here. It is one of the most common moments of mild panic for travellers and new arrivals, and it is largely avoidable, because there is a universal key that works almost everywhere: the active ingredient. The brand changes from country to country and company to company, but the active ingredient is the same molecule the world over. Learn to read it, and you can usually find your medicine wherever you are. This guide explains how the naming works, the traps to watch for, and a decoder that turns dozens of familiar brand names into the universal ingredient underneath.
Key facts
- Every medicine has one International Nonproprietary Name (INN), the active ingredient, assigned by the World Health Organization and the same in every country.
- A brand name is a company’s trademark, not the medicine; one ingredient is sold under many brands, and brands change by country and manufacturer.
- Some generic names have two spellings for the same molecule, a British-and-Commonwealth one and a United States one, such as paracetamol and acetaminophen.
- The same brand can hold a different active ingredient in different countries, so always read the ingredient, not the logo.
- Many cold, flu and pain brands are combinations, so it is easy to double up on one ingredient, such as paracetamol, without noticing.
- Some ingredients are restricted or controlled in certain countries even when they are everyday items elsewhere, so a brand may be reformulated or unavailable.
- The active ingredient is printed on the box and leaflet; note it and the strength for everything you take before you travel.
What is the difference between a brand name and the active ingredient?
The active ingredient is the medicine itself, one globally recognised name that never changes; the brand name is only a company’s trademark for a product built around it. Learn to read the active ingredient and you can recognise your medicine whatever the box says.
Behind every brand is a single, globally recognised name for the active ingredient. The World Health Organization runs the system that assigns these, called International Nonproprietary Names, or INNs. Each one is a unique name, recognised worldwide and free for anyone to use, that identifies the actual pharmaceutical substance. That INN is what we mean by the active ingredient or the generic name, and it is the thing that does not change when you cross a border.
A brand name, by contrast, is just a company’s trademark for a product built around that ingredient. A single ingredient can be sold under many different brands, in different countries, by different manufacturers. The generic version is the same active ingredient without the brand: the US Food and Drug Administration describes how generic medicines have the same strength, dosage form and clinical benefit as the brand-name original. So once you know the active ingredient, you can recognise your medicine whatever the box says, and usually pay a lot less for it.
Why does the same generic name have two spellings?
Some active ingredients carry two names for the identical molecule, a British-and-Commonwealth spelling and a United States one. The medicine is the same; only the naming convention differs. This trips people up constantly:
| Used across the UK, Europe and Asia | The United States name |
|---|---|
| Paracetamol | Acetaminophen |
| Salbutamol (the blue asthma reliever) | Albuterol |
| Adrenaline | Epinephrine |
If a name looks unfamiliar, this split is often why. The medicine is identical; only the naming convention differs. Tylenol and Panadol are both paracetamol, and a Ventolin inhaler is salbutamol whether the label calls it salbutamol or albuterol.
Can the same brand contain a different drug abroad?
Yes, and this is the trap that genuinely matters for safety. A brand name is owned by a company, and that company can put different ingredients under the same name in different countries. The classic example is Benadryl: in the United States it contains the antihistamine diphenhydramine, but in some other countries the same brand name has been used for products built around entirely different antihistamines. Same box, same logo, different drug inside.
This is why you should never rely on the brand name alone abroad, and always read the active ingredient. Two related traps make the same point:
- Combination products. Many cold, flu and pain brands are mixtures, often paracetamol plus a decongestant plus something else. The brand tells you nothing about what is really inside, and it is easy to double up on paracetamol without realising, which is dangerous. Check the ingredients list every time.
- Restricted ingredients. Some active ingredients are controlled or restricted in certain countries even when they are everyday items elsewhere. Pseudoephedrine, the decongestant in many Sudafed products, is one: a number of countries restrict or control it, so the same brand may be reformulated or unavailable depending on where you are.
The rule that protects you everywhere is simple: identify the active ingredient, not the brand.
Which active ingredient is behind my brand?
Look it up in the decoder below. Here are the active ingredients behind many of the world’s best-known medicine brands, grouped by what they are for. Where we have a page on the ingredient, it is linked, so you can see the brands that share that molecule and find it wherever you are. You can also browse the same medicines by category or by the condition they treat.
Pain, fever and inflammation
| Familiar brands | Active ingredient |
|---|---|
| Tylenol, Panadol, Calpol | paracetamol (acetaminophen in the US) |
| Advil, Motrin, Nurofen | ibuprofen |
| Aleve, Naprosyn | naproxen |
| Voltaren, Voltarol | diclofenac |
| Celebrex | celecoxib |
| Aspirin, Bayer | acetylsalicylic acid (aspirin) |
Allergies and hay fever
| Familiar brands | Active ingredient |
|---|---|
| Claritin, Clarityn | loratadine |
| Zyrtec, Reactine | cetirizine |
| Allegra, Telfast | fexofenadine |
| Benadryl (US) | diphenhydramine (check the box elsewhere) |
| Singulair | montelukast |
Heartburn, acid and the stomach
| Familiar brands | Active ingredient |
|---|---|
| Prilosec, Losec | omeprazole |
| Nexium | esomeprazole |
| Prevacid, Zoton | lansoprazole |
| Pepcid | famotidine |
| Imodium | loperamide |
| Motilium | domperidone |
| Maxolon, Reglan | metoclopramide |
Coughs, colds and congestion
| Familiar brands | Active ingredient |
|---|---|
| Sudafed | pseudoephedrine (restricted in some countries) |
| Robitussin DM, Delsym | dextromethorphan |
| Mucinex | guaifenesin |
| Most multi-symptom cold and flu brands | combinations built around paracetamol |
Asthma and breathing
| Familiar brands | Active ingredient |
|---|---|
| Ventolin | salbutamol (albuterol in the US) |
| Pulmicort | budesonide |
| Flixotide, Flovent | fluticasone |
| Becotide, Qvar | beclometasone |
| Singulair | montelukast |
Heart, blood pressure and cholesterol
| Familiar brands | Active ingredient |
|---|---|
| Lipitor | atorvastatin |
| Crestor | rosuvastatin |
| Zocor | simvastatin |
| Norvasc | amlodipine |
| Cozaar | losartan |
Diabetes
| Familiar brands | Active ingredient |
|---|---|
| Glucophage | metformin |
| Januvia | sitagliptin |
| Jardiance | empagliflozin |
| Forxiga, Farxiga | dapagliflozin |
Sleep and mental health
| Familiar brands | Active ingredient |
|---|---|
| Circadin | melatonin |
| Ambien, Stilnox | zolpidem |
| Prozac | fluoxetine |
| Zoloft, Lustral | sertraline |
| Lexapro, Cipralex | escitalopram |
| Xanax | alprazolam |
| Valium | diazepam |
Infections: antibiotics and antifungals
| Familiar brands | Active ingredient |
|---|---|
| Amoxil | amoxicillin |
| Augmentin | amoxicillin with clavulanic acid |
| Zithromax | azithromycin |
| Cipro | ciprofloxacin |
| Flagyl | metronidazole |
| Canesten | clotrimazole |
| Lamisil | terbinafine |
| Daktarin | miconazole |
| Nizoral | ketoconazole |
Skin, thyroid and men’s health
| Familiar brands | Active ingredient |
|---|---|
| Differin | adapalene |
| Synthroid, Eltroxin | levothyroxine |
| Viagra | sildenafil |
| Cialis | tadalafil |
| Levitra | vardenafil |
How can I confirm exactly what a product contains?
Check the official medicines database of the country the product came from, not forum posts or reseller pages. A few useful ones:
| Where the product is from | Official database |
|---|---|
| Singapore | HSA Infosearch |
| Hong Kong | Drug Office database |
| Thailand | Thai FDA |
| United States | DailyMed |
| Europe | EMA medicines |
| Australia | TGA |
| New Zealand | Medsafe |
How do I find the active ingredient on my own box?
Read the small print: the active ingredient is printed on the box and at the top of the leaflet, usually just below or beside the big brand name. You rarely need to memorise any of this, because the answer is printed on the medicine itself. The active ingredient, the INN, is almost always shown on the front or side of the box and at the top of the leaflet, usually in smaller type just below or beside the big brand name. On a leaflet it often appears as a line like “the active ingredient is…”. Before you travel, it is worth jotting down the active ingredient and the strength of everything you take regularly, so you have the universal name to hand rather than just the brand.
If you only ever remember one habit from this guide, make it this: read the small print, not the big name.
Does knowing the active ingredient save money?
Yes, because it lets you recognise the generic, the identical active ingredient sold without the brand-name premium. Knowing the active ingredient does more than help you find your medicine. For anything you take regularly, that difference adds up over a year, and it is the single easiest saving in medicine. Our guide to buying generic medicines in Asia explains why the generic is almost always the smart choice, and our active ingredient directory lets you compare the brand and generic options that share each molecule.
Do and don’t
Do:
- Read the active ingredient and strength on the box, not just the brand name.
- Note the active ingredient of everything you take regularly before you travel.
- Watch for the two spellings of a name, such as paracetamol and acetaminophen.
- Check the ingredients list on cold, flu and combination products so you do not double up on one ingredient.
- Confirm an unfamiliar product against the official medicines database of the country it came from.
- Ask a pharmacist or doctor if you are unsure which local product matches your medicine.
Don’t:
- Rely on the brand name alone abroad, because the same brand can hold a different ingredient.
- Assume a restricted ingredient is available everywhere; some are controlled in certain countries.
- Take two products that both contain the same active ingredient without checking.
- Trust a price that looks too good to be true, or a pack with no clear ingredient, batch or expiry.
Frequently asked questions
Why isn’t my usual brand sold here? Brands are licensed and marketed country by country, so your home brand may simply not be sold where you are, even though the active ingredient almost certainly is, under a local brand or as a generic. Search by the active ingredient and you will usually find it.
Is the generic as good as the brand? A generic has the same active ingredient as the brand, and the US Food and Drug Administration notes that approved generics provide the same strength, dosage form and clinical benefit. The main difference is the price.
How do I ask for my medicine if I do not speak the local language? Carry the active ingredient and strength written down, or a photo of your old box showing them, because the ingredient name is usually recognised in any language. For an ongoing condition, use a clinic or hospital pharmacy with staff who speak your language rather than work it out at a busy counter.
Where to go next
The brand name is just a label, and it changes wherever you go. The active ingredient is the real medicine, and it stays the same. Learn yours, read the box rather than the brand, and you can recognise your medicine almost anywhere. Browse our full active ingredient directory to look up any of the ingredients above and see the brands that share each molecule, browse by category or condition, and see how ordering and delivery work.
To match a home brand to a local equivalent, our country guides show how pharmacies and prescriptions work in each place: Thailand, Singapore, Malaysia, Hong Kong, the Philippines and Bali. Our guide to buying generic medicines in Asia covers choosing the generic once you know the active ingredient.
This guide is general information, not medical advice. Active-ingredient names and the contents of branded products can vary and change, so always check the packaging and, if in any doubt, ask a pharmacist or doctor.
Useful links
- World Health Organization: International Nonproprietary Names (INN)
- US Food and Drug Administration: generic drug facts
