WHO naming stem · suffix · 9 listed names
-vaptan
vasopressin receptor antagonists
Where it sits in a name
WHO writes the stem as -vaptan. So the letters vaptan sit at the end of the name (…vaptan).
All 9 names WHO lists under -vaptan
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.
- balovaptan
- conivaptan
- lixivaptan
- mozavaptan
- nelivaptan
- relcovaptan
- ribuvaptan
- satavaptan
- tolvaptan
Decode another name
Decoded
tolvaptan
Listed INNCarries 2 WHO stems, most specific first: -vaptan …
- -vaptanend of the nameWHO lists it hereWHO definition: vasopressin receptor antagonists
- -apt-inside the nameWHO definition: aptamers, classical and mirror ones
“tolvaptan” is an INN that WHO lists under -vaptan 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 -vaptan (Part II B) and the 9 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.