Pharmacy technician (PTCE, ExCPT)
Drug suffixes and the classes they signal
Choose a name stem: the tool shows the class it signals, the drugs of the top 200 list that carry it, and any name that ends the same way but belongs elsewhere.
In the top 200 list
- metoprolol (Lopressor)
- atenolol (Tenormin)
- propranolol (Inderal)
- timolol (Timoptic)
-olol signals
Beta blockers
4 drugs of the list carry it.
Generic drug names in the United States are not random. Most are built by the United States Adopted Names Council, run with the American Medical Association, from a stem that signals how the drug works: a name ending in -olol is a beta blocker, -pril an ACE inhibitor, -sartan an angiotensin receptor blocker, -prazole a proton pump inhibitor. Learning about 25 common stems turns hundreds of names into a handful of families, which is why stems are the fastest route through the medications domain of the pharmacy technician exams. The rule has limits. Older drugs were named before stems were set, some stems are shared by two classes, and a few names end like a stem by chance: aripiprazole ends in -prazole but is an antipsychotic, and nystatin sounds like a statin but treats fungal infections. The tool above lists, for each stem, the drugs of our list of 200 that carry it, checked against their FDA class, and flags the look-alikes.
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The stems in our list
| Stem | Class it signals | Examples from the top 200 |
|---|---|---|
| -olol | Beta blockers | metoprolol, atenolol, propranolol, timolol |
| -pril | ACE inhibitors | lisinopril, benazepril, enalapril, ramipril |
| -sartan | Angiotensin II receptor blockers | losartan, valsartan, olmesartan, irbesartan |
| -vastatin | HMG-CoA reductase inhibitors (statins) | atorvastatin, simvastatin, rosuvastatin, pravastatin |
| -prazole | Proton pump inhibitors | omeprazole, pantoprazole, esomeprazole, lansoprazole |
| -dipine | Dihydropyridine calcium channel blockers | amlodipine, nifedipine |
| -tidine | H2 receptor antagonists | famotidine |
| -gliptin | DPP-4 inhibitors | sitagliptin |
| -gliflozin | SGLT2 inhibitors | empagliflozin |
| -glutide | GLP-1 receptor agonists | dulaglutide, semaglutide |
| -azepam / -azolam | Benzodiazepines | alprazolam, clonazepam, lorazepam, diazepam |
| -floxacin | Fluoroquinolone antibiotics | ciprofloxacin, levofloxacin |
| -cycline | Tetracycline antibiotics | doxycycline |
| cef- / ceph- | Cephalosporin antibiotics | cephalexin, cefdinir |
| -cillin | Penicillin antibiotics | amoxicillin, penicillin V |
| -conazole | Azole antifungals | fluconazole |
| -vir | Antivirals | valacyclovir, acyclovir, oseltamivir |
| -triptan | Serotonin 5-HT1B/1D agonists (migraine) | sumatriptan |
| -setron | Serotonin 5-HT3 antagonists (nausea) | ondansetron |
| -lukast | Leukotriene receptor antagonists | montelukast |
| -terol | Beta-2 agonists (bronchodilators) | albuterol |
| -sone / -olone | Corticosteroids | fluticasone, prednisone, triamcinolone, hydrocortisone |
| -xaban | Factor Xa inhibitors | apixaban, rivaroxaban |
| -dronate | Bisphosphonates | alendronate, ibandronate |
| -osin | Alpha-1 blockers | tamsulosin, doxazosin |
Some families are large: four statins, four ACE inhibitors, four angiotensin receptor blockers and four proton pump inhibitors appear in the list. Learning the stem first and the members second halves the effort for those decks.
Names that end like a stem but belong elsewhere
| Drug | Ends like | Which signals | Its actual FDA class |
|---|---|---|---|
| aripiprazole | -prazole | Proton pump inhibitors | Atypical Antipsychotic |
Two classic traps need no table. Nystatin ends in -statin but is an antifungal, which is why our stem for the cholesterol drugs is -vastatin. And -vir alone only says "antiviral": valacyclovir works on herpes viruses, oseltamivir on influenza. When a stem is broad, the use on the prescription settles it.
Look-alike, sound-alike names
Stems also explain why some names are easy to confuse: they share most of their letters. The safety domain of the PTCE outline lists look-alike, sound-alike medications, high-alert drugs and error prevention strategies. Typical exam pairs mix two classes, such as hydroxyzine (an antihistamine) and hydralazine (a blood pressure drug), or clonidine and clonazepam. Tall man lettering, separate shelf locations and a check of the use on the prescription are the usual answers to how such errors are prevented.
Using stems in practice
- Learn the ten largest families first: -olol, -pril, -sartan, -vastatin, -prazole, -dipine, the benzodiazepines, the corticosteroids, -floxacin and -cillin.
- For each, recall one member, its brand and its use, using the flash cards.
- Test with the drug quiz: class questions are where stems pay off.
The five questions under the tool come from our pool for the patient safety domain of the PTCE.