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 completely avoidable, because there is a universal key that works 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 find your medicine anywhere on earth. 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.
Every medicine has one universal name
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.
The transatlantic trap
Even the generic names sometimes come in two flavours, usually a British-and-Commonwealth version and an American one, for the very same molecule. 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.
The dangerous trap: same brand, different drug
Here is the one 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.
The decoder
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.
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 |
Where to verify your medicine
If you want to confirm exactly what a product contains, the most reliable source is the official medicines database of the country it came from, which beats forum posts and 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 to find the active ingredient on your own box
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.
It saves you money, too
Knowing the active ingredient does more than help you find your medicine. It is also how you keep the cost down, because it lets you recognise the generic, the identical active ingredient sold without the brand-name premium. 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.
Frequently asked questions
Is paracetamol the same as acetaminophen?
Yes. They are two names for the same active ingredient, paracetamol in most of the world and acetaminophen in the United States. The main thing to watch is not taking two products that both contain it.
Is Ventolin the same as albuterol?
The blue Ventolin reliever inhaler contains salbutamol, which is called albuterol in the United States. Same medicine, different name for the ingredient. With inhalers, the device and your technique also matter, so check those if you are handed an unfamiliar one.
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?
Yes. 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.
Why does Benadryl contain different things in different countries?
Because the brand belongs to a company, not to a single ingredient, and the same brand name can be used for products with different active ingredients in different markets. It is the clearest reason to always read the active ingredient rather than trusting the brand.
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 never does. Learn yours, read the box rather than the brand, and you can recognise and buy your medicine confidently anywhere. Browse our full active ingredient directory to look up any of the ingredients above and see the brands that share each molecule, see how ordering and delivery work, and for buying medicine in specific countries read our guides to Thailand, Bali and Singapore.
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
