thisdrug what a medicine's name tells you

WHO naming stem · prefix · 11 listed names

nal-

opioid receptor antagonists/agonists related to normorphine

WHO's definition, quoted as written in the 2024 stem book
Names only. This page is about nal- as a part of a name. It has nothing on uses, doses, side effects or interactions of any medicine that carries it, and nothing here is medical advice. Ask a pharmacist or doctor about the medicine itself.

Where it sits in a name

WHO writes the stem as nal-. So the letters nal sit at the start of the name (nal…).

All 11 names WHO lists under nal-

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.

  1. nalbuphine
  2. naldemedine
  3. nalfurafine
  4. nalmefene
  5. nalmetrene
  6. nalmexone
  7. nalorphine
  8. naloxegol
  9. naloxone
  10. naltalimide
  11. naltrexone

Decode another name

Decoded

naloxone

Listed INNCarries the WHO stem nal-

  • nal-start of the nameWHO lists it hereWHO definition: opioid receptor antagonists/agonists related to normorphine

“naloxone” is an INN that WHO lists under nal- 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 nal- (Part II B) and the 11 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.