moleculefinder

Metamizole

C13H16N3NaO4S333.34 g/mol Calculated

Also called dipyrone, Novaldin, Diprofarn and Neomelurbrin.

A non-opioid painkiller and fever reducer widely used in Europe and Latin America, withdrawn in the United States and UK over a rare blood disorder.

Sources and notes
  • The introductionfrom sourceMoleculeFinder curated
  • Other namesfrom sourceWikidataIts English label and aliases on Wikidata.
  • Formula and weightcomputedPubChem
  • 2D drawingcomputedPubChem structure, drawn by RDKit

Where you encounter it

Dispensed on prescription, not sold on a shelf.

Sources and notes
  • The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.

Explore its structure

Choose a part to light it up.

Six carbons in a flat hexagon, sharing their electrons evenly around the ring. It is stable, flat and oily, and it stacks readily against other flat rings.

From: standard chemistry.

Sources and notes
  • The drawingcomputedPubChem structure, drawn by RDKitThe page's one shipped drawing, with the chosen part lit in amber under it.
  • The partscomputedFound by ruleEach part is found by a chemical pattern, never picked by hand atom by atom; its words say where they come from.

Properties and sources

Calculated by PubChem

Molecular formula
C13H16N3NaO4S
Molecular weight
333.34 g/mol
Polar surface areatopological
92.4 Ų
H-bond donors
0
H-bond acceptors
6
Rotatable bonds
4
Complexity
552

Reported Hazard label (GHS), ECHA via PubChem

Danger Irritant pictogram (GHS07), Health hazard pictogram (GHS08) and Environmental pictogram (GHS09); hazard statements H302, H317, H334, H361, H372, H411

Groups it belongs to

Category
Prescription medicine
Family
Non-opioid painkillers
Chemical groups
Aromatics
Elements
Nitrogen, Sodium, Sulfur
Hazard classes
Irritant, Health hazard, Environmental hazard, GHS Danger
SMILESCC1=C(C(=O)N(N1C)C2=CC=CC=C2)N(C)CS(=O)(=O)[O-].[Na+]

PubChem CID 522325 · Wikidata Q422761 · InChIKey DJGAAPFSPWAYTJ-UHFFFAOYSA-M · Data refreshed

How MoleculeFinder sources and labels its data

Questions
What is Metamizole?
A non-opioid painkiller and fever reducer widely used in Europe and Latin America, withdrawn in the United States and UK over a rare blood disorder.
How toxic is Metamizole?
Its GHS hazard label carries the signal word Danger and the hazard pictograms Irritant, Health hazard and Environmental. from source
What kind of molecule is Metamizole?
Metamizole has the formula C13H16N3NaO4S and a molecular weight of 333.34 g/mol. MoleculeFinder files it under non-opioid painkillers, in the prescription medicine group. from sourcefrom sourcefrom sourcefrom source
What else is Metamizole called?
Metamizole is also called dipyrone, Novaldin, Diprofarn and Neomelurbrin. from source
Sources and notes
  • Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
  • Hazard labelfrom sourceECHA via PubChemThe label combines these classifications.
  • ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
  • Data refreshedfrom sourceMoleculeFinder2026-11-09