Montelukast
Also called Singulair and Brondilat.
An airway medicine sold as Singulair, used for asthma and hay fever. It blocks leukotrienes rather than histamine.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Other namesfrom sourcePubChem / Wikidata
- Formula and weightcomputedPubChem
- 2D drawingcomputedPubChem structure, drawn by RDKit
- 3D modelfrom sourcePubChem 3D conformerLoaded after the page has painted, and on a phone only when you ask for it; the 2D drawing shows until it arrives.
Where you encounter it
Dispensed on prescription, not sold on a shelf. Montelukast on the product labels we hold.
Medicines
Every product and list we hold
Sources and notes
- The product labels and their strengthsfrom sourceDailyMed (FDA label)Each label lists the molecule as an ingredient, and an active ingredient at the strength shown.
- How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.
- The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.
Explore its structure
Choose a part to light it up.
A carbon carrying both a C=O and an O-H, written COOH. In water it gives up that hydrogen, which is what makes the molecule an acid.
From: standard chemistry.
An O-H on a carbon that is not part of an aromatic ring, the group that makes a molecule an alcohol. It both gives and accepts hydrogen bonds, which helps the molecule mix with water.
From: standard chemistry.
Fluorine, chlorine, bromine or iodine bonded to carbon. Each pulls electrons toward itself, and each is larger than the hydrogen the carbon would otherwise carry.
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
- C35H36ClNO3S
- Molecular weight
- 586.2 g/mol
- XLogP3octanol/water, log units
- 7.7
- Polar surface areatopological
- 95.7 Ų
- H-bond donors
- 2
- H-bond acceptors
- 5
- Rotatable bonds
- 12
- Complexity
- 891
Reported Hazard label (GHS), ECHA via PubChem
Warning Irritant pictogram (GHS07); hazard statements H302, H312, H332
Reported Licence
The US Food and Drug Administration licenses Montelukast for human use (NDA 020829, authorized February 20, 1998). Drugs@FDA
Groups it belongs to
- Category
- Prescription medicine
- Family
- Airway medicines
- Chemical groups
- Alcohols, Carboxylic Acids, Aromatics, Halogenated
- Hazard classes
- Irritant, GHS Warning
CC(C)(C1=CC=CC=C1CC[C@H](C2=CC=CC(=C2)/C=C/C3=NC…87 charactersPubChem CID 5281040 · Wikidata Q417767 · InChIKey UCHDWCPVSPXUMX-TZIWLTJVSA-N · Data refreshed
Questions
- What is Montelukast?
- An airway medicine sold as Singulair, used for asthma and hay fever. It blocks leukotrienes rather than histamine.
- How toxic is Montelukast?
- Its GHS hazard label carries the signal word Warning and the hazard pictogram Irritant. from source
- What kind of molecule is Montelukast?
- Montelukast has the formula C35H36ClNO3S and a molecular weight of 586.2 g/mol. MoleculeFinder files it under airway medicines, in the prescription medicine group. from sourcefrom sourcefrom sourcefrom source
- Who licenses Montelukast as a medicine?
- The US Food and Drug Administration licenses Montelukast for human use (NDA 020829, authorized February 20, 1998). 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.
- Licencefrom sourceDrugs@FDARead 2026-10-21.
- Data refreshedfrom sourceMoleculeFinder2026-11-09