WHO naming stem · suffix · 82 listed names
-onium
quaternary ammonium compounds
Where it sits in a name
WHO writes the stem as -onium. So the letters onium sit at the end of the name (…onium).
All 82 names WHO lists under -onium
These are the INN in group (a) of Part IV of the stem book: names in which WHO says the stem is used as defined. The stem is marked where WHO places it. A-Z as WHO lists them.
- aclatonium napadisilate
- alcuronium chloride
- ambenonium chloride
- azamethonium bromide
- benzalkonium chloride
- benzethonium chloride
- benzilonium bromide
- benzopyrronium bromide
- benzoxonium chloride
- bevonium metilsulfate
- candocuronium iodide
- carpronium chloride
- cefalonium
- cetalkonium chloride
- cethexonium chloride
- cetrimonium bromide
- ciclonium bromide
- cyclopyrronium bromide
- dacuronium bromide
- decamethonium bromide
- deditonium bromide
- denatonium benzoate
- diponium bromide
- disiquonium chloride
- dodeclonium bromide
- dotefonium bromide
- emepronium bromide
- fenclexonium metilsulfate
- fentonium bromide
- fludazonium chloride
- fubrogonium iodide
- furtrethonium iodide
- glycopyrronium bromide
- heteronium bromide
- hexafluronium bromide
- hexamethonium bromide
- hexasonium iodide
- hexopyrronium bromide
- lauralkonium chloride
- mebezonium iodide
- mecetronium etilsulfate
- metalkonium chloride
- methylbenzethonium chloride
- miristalkonium chloride
- octafonium chloride
- opratonium iodide
- otilonium bromide
- oxitefonium bromide
- oxydipentonium chloride
- oxyphenonium bromide
- oxypyrronium bromide
- oxysonium iodide
- pancuronium bromide
- penoctonium bromide
- pentamethonium bromide
- pentolonium tartrate
- pipecuronium bromide
- pirralkonium bromide
- polidronium chloride
- polixetonium chloride
- prodeconium bromide
- prolonium iodide
- rapacuronium bromide
- ritropirronium bromide
- rocuronium bromide
- sepazonium chloride
- sofpironium bromide
- stercuronium iodide
- stilonium iodide
- sultroponium
- suxamethonium chloride
- suxethonium chloride
- tetradonium bromide
- tetrylammonium bromide
- tiametonium iodide
- tibezonium iodide
- tiemonium iodide
- tiodonium chloride
- toloconium metilsulfate
- tonzonium bromide
- triclobisonium chloride
- vecuronium bromide
Decode another name
Decoded
cefalonium
Listed INNCarries 3 WHO stems, most specific first: -onium …
- -oniumend of the nameWHO lists it hereWHO definition: quaternary ammonium compounds
- -iumend of the nameWHO lists it hereWHO definition: quaternary ammonium compounds
- cef-start of the nameWHO lists it hereWHO definition: antibiotics, cefalosporanic acid derivatives
“cefalonium” is an INN that WHO lists under -onium, -ium, cef- in the 2024 stem book.
The same decoder as the front page: it reads the letters of a name against all 482 WHO stems, in your browser.
Source and licence
The definition of -onium (Part II B) and the 82 names (Part IV, group (a)) are from Use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances, 2024 (World Health Organization, Stem book 2024 (ISBN 978-92-4-009938-8); covers proposed INN Lists 1-129). Checked .
Adapted from: Use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances, 2024. Geneva: World Health Organization; 2024. Licence: CC BY-NC-SA 3.0 IGO. This adaptation was not created by WHO; WHO is not responsible for its content or accuracy and does not endorse this site. The data file stems.json is shared under the same licence.