Brand names, generic names and drug classes: how to match them fast
PTCB topic: Generic/brand names and drug classes
- A generic name is public; a brand name is a company trademark.
- -pril = ACE inhibitor; -sartan = ARB; -vastatin = statin.
- -olol = beta blocker; -dipine = calcium channel blocker; -prazole = PPI.
- Warfarin and levothyroxine have no class stem, so memorize them.
- Stems can fool you: aripiprazole is an antipsychotic, not a PPI.
Key facts
- A generic (nonproprietary) name identifies the active substance and is public property; a brand name is a trademark owned by the company.
- -pril = ACE inhibitor (lisinopril, Zestril); -sartan = angiotensin II receptor blocker (losartan, Cozaar).
- -vastatin = HMG-CoA reductase inhibitor, or statin (atorvastatin, Lipitor; also simvastatin).
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- -olol = beta blocker (metoprolol); -dipine = calcium channel blocker (amlodipine).
- -prazole = proton pump inhibitor (omeprazole, Prilosec; also pantoprazole and esomeprazole).
- -xaban = factor Xa inhibitor (apixaban, Eliquis); clopidogrel (Plavix) is a P2Y12 platelet inhibitor.
- Warfarin (Jantoven) is a vitamin K antagonist and levothyroxine (Synthroid) is synthetic thyroid hormone (T4); neither name has a class stem.
Quick check1 question · 2 more at the end
A prescription is written for Lipitor 20 mg tablets. Which generic drug does Lipitor contain?
Correct answer: B.
Lipitor is the brand name for atorvastatin calcium, an HMG-CoA reductase inhibitor (statin). Simvastatin (Zocor) and rosuvastatin (Crestor) are other statins, so the shared "-vastatin" ending tells you the class but not the exact drug. Learn each brand with its own generic name.
A Simvastatin is a statin too, but its brand name is Zocor, not Lipitor.
B Correct: the Lipitor label lists atorvastatin calcium as the active ingredient.
C Rosuvastatin is the statin sold as Crestor, so it is a same-class mix-up.
D Lisinopril is an ACE inhibitor (Zestril); it is not a statin and has no link to Lipitor.
Full lesson
Each part starts with its main idea. Open a part when you want the details.
The short answer: A generic name is the drug's public, nonproprietary name; a brand name is the maker's trademark. Many generic names end in a stem that signals the class: -pril for ACE inhibitors, -sartan for ARBs, -vastatin for statins, -olol for beta blockers, -prazole for PPIs. Learn each brand with its generic, then confirm the class on the label.
1 What is the difference between a generic name and a brand name?The generic name identifies the active drug, while the brand name is one company's trademark for it. 1 min
The generic name identifies the active drug, while the brand name is one company's trademark for it. WHO calls the generic name a nonproprietary name: it is public property, and countries are asked not to let anyone register it as a trademark.
- Generic name: lowercase, one per active ingredient (atorvastatin).
- Brand name: capitalized, owned by the maker (Lipitor). One generic can have several brands.
- Drug class: the group the drug belongs to by how it works (HMG-CoA reductase inhibitor, or statin).
The 2026 PTCE outline lists generic names, brand names and drug classes as one knowledge area, so learn all three together.
2 How do naming stems reveal the drug class?Drugs in the same class often share the same ending, called a stem. 1 min
Drugs in the same class often share the same ending, called a stem. WHO's naming rules say a name should, where appropriate, show that a drug is related to others in its group.
| Stem | Class | Examples |
|---|---|---|
| -pril | ACE inhibitor | lisinopril (Zestril) |
| -sartan | Angiotensin II receptor blocker (ARB) | losartan (Cozaar), valsartan |
| -vastatin | Statin (HMG-CoA reductase inhibitor) | atorvastatin (Lipitor), simvastatin |
| -olol | Beta blocker | metoprolol, propranolol |
| -dipine | Calcium channel blocker | amlodipine, nifedipine |
| -prazole | Proton pump inhibitor (PPI) | omeprazole (Prilosec), pantoprazole |
| -xaban | Factor Xa inhibitor | apixaban (Eliquis), rivaroxaban |
| -gliptin / -gliflozin | DPP-4 inhibitor / SGLT2 inhibitor | sitagliptin / empagliflozin |
3 Which stems are easy to miss, and which drugs must you memorize?Some stems are less familiar, and a few key drugs have no class ending at all. 1 min
Some stems are less familiar, and a few key drugs have no class ending at all. These are worth learning as brand–generic–class sets:
- -grel: clopidogrel (Plavix), a P2Y12 platelet inhibitor. WHO uses -grel for platelet aggregation inhibitors.
- -formin: metformin, an antihyperglycemic.
- -azolam / -azepam: alprazolam (Xanax), a benzodiazepine. WHO groups both stems, as in lorazepam, as diazepam derivatives.
- -traline: sertraline, a serotonin reuptake inhibitor.
- No class ending: warfarin (Jantoven), a vitamin K antagonist, and levothyroxine (Synthroid), synthetic thyroid hormone (T4).
These pairs are our own selection of common outpatient drugs, not an official PTCB list. PTCB does not publish a drug list.
4 Where do stems lead you astray?Stems help, but a few letters can fool you, so always confirm the class on the label. 1 min
Stems help, but a few letters can fool you, so always confirm the class on the label. Watch for these:
- Aripiprazole (Abilify) ends in -piprazole, a WHO stem for psychotropic drugs. Its label calls it an atypical antipsychotic, not a PPI.
- Carvedilol (Coreg) blocks beta receptors, but its label calls it an alpha-/beta-adrenergic blocking agent.
- Zolpidem (Ambien) is a C-IV sleep medicine like the benzodiazepines, but its label puts it in the imidazopyridine class.
- Look-alike starts such as "levo-" share letters, not a class: levothyroxine is a thyroid hormone, while levofloxacin ends in the antibacterial stem -oxacin.
5 What the technician doesThe technician picks the right product and keeps an eye out for mix-ups; the pharmacist handles clinical questions. 1 min
The technician picks the right product and keeps an eye out for mix-ups; the pharmacist handles clinical questions. In daily work that means:
- Match the brand on the prescription to the correct generic in the system before filling.
- Read the whole name, not just the stem or the first syllable.
- Use the class to spot two drugs that may duplicate each other, then flag it for the pharmacist.
Common mistakes
The traps students fall into most. Read these before you practice.
Watch out: Aripiprazole (Abilify) is an atypical antipsychotic, not a proton pump inhibitor; its stem is -piprazole, not -prazole.
Watch out: Losartan is an ARB, not an ACE inhibitor; ACE inhibitors end in -pril.
Watch out: Zolpidem (Ambien) is a C-IV sedative of the imidazopyridine class, not a benzodiazepine like alprazolam (Xanax).
Watch out: Carvedilol (Coreg) is labeled an alpha-/beta-adrenergic blocking agent, not a plain beta blocker, even though it blocks beta receptors.
How to remember it
Read a generic name from the tail, because the last syllables usually tell you the family. A memory hook: "-pril, -sartan, -olol and -dipine lower blood pressure; -vastatin lowers cholesterol; -prazole lowers stomach acid." Then learn the no-stem drugs as flashcards.
Self-check:
- Cover the examples column of the table and name the brand for lisinopril, losartan and atorvastatin.
- Say the class of losartan, apixaban and sitagliptin without looking.
- Name one drug whose stem looks like a PPI but is not one.