Last update 03 Aug 2026

Montelukast sodium

Overview

Basic Info

SummaryMontelukast sodium, marketed under the trade name SINGULAIR®, is a medication approved for the treatment of asthma, exercise-induced bronchoconstriction (EIB), and allergic rhinitis. It belongs to the class of drugs known as CysLT antagonists and works by blocking leukotrienes, which are chemicals that cause inflammation in the body. Montelukast sodium was first approved in 1997 in Mexico and has since been widely used in the management of asthma and allergic rhinitis worldwide. Chemically described as [R-(E)]-1-[[[1-[3-[2-(7-chloro-2-quinolinyl)ethenyl]phenyl]-3-[2-(1-hydroxy-1-methylethyl)phenyl]propyl]thio]methyl]cyclopropaneacetic acid, monosodium salt, the drug is available in tablet, chewable tablet, and oral granule formulations.
Drug Type
Small molecule drug
Synonyms
Montelukast, Montelukast sodium (JP17/USP), Montelukast Sodium Oral Granules
+ [16]
Target
Action
antagonists
Mechanism
CysLT antagonists(Cysteinyl leukotriene receptor antagonists)
Drug Highest PhaseApproved
First Approval Date
United States (20 Feb 1998),
Regulation-
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Structure/Sequence

Molecular FormulaC35H36ClNNaO3S
InChIKeyZMFQNQCXWQXCFO-HKHDRNBDSA-N
CAS Registry151767-02-1

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Asthma, Exercise-Induced
United States
13 Apr 2007
Rhinitis, Allergic
United States
27 Jul 2005
Rhinitis, Allergic, Perennial
United States
27 Jul 2005
Rhinitis, Allergic, Seasonal
United States
31 Dec 2002
Asthma
United States
20 Feb 1998
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Parkinson DiseasePhase 3
Sweden
03 Aug 2026
Sleep Apnea, ObstructivePhase 3
United States
01 Sep 2010
Respiratory Tract InfectionsPhase 3
Israel
01 Nov 2007
Allergic asthmaPhase 3-01 Mar 2006
airway diseasePhase 3
Italy
01 Sep 2005
Acute asthmaPhase 3-01 Jul 2004
BronchiolitisPhase 3-01 Aug 2003
CoughPhase 3-01 Aug 2003
Respiratory Syncytial Virus InfectionsPhase 3-01 Aug 2003
Persistent asthmaPhase 3-01 Oct 2001
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Not Applicable
152
Inhaled Corticosteroids + Montelukast
tustxwjgxq(qcaxnrhyik) = bukiscuxxa ovclfahqaa (njpyunmdkb )
Non-inferior
01 May 2026
Inhaled Corticosteroids + Tiotropium
tustxwjgxq(qcaxnrhyik) = upyjsixpvc ovclfahqaa (njpyunmdkb )
Phase 3
116
Placebo
(Control)
eciynidssd(aljipdvzpf) = djbfiwwmbg yemepvvswm (enffybuzyh, mwivruxkss - psfpsabdub)
-
21 Apr 2026
(Study Group)
eciynidssd(aljipdvzpf) = qfopizodaf yemepvvswm (enffybuzyh, hfyogxmfru - azxemcqotk)
Not Applicable
10,868
wooyvpdmis(lfiovzimza) = lpofjqxxym agfupnierx (ctyrcbsuyn )
Negative
18 Feb 2026
Corticosteroids Alone
wooyvpdmis(lfiovzimza) = grxzlyghsp agfupnierx (ctyrcbsuyn )
Phase 2
-
40
bxjmtihfci = hhlsibbzyr haulbpymfm (utrptwsqgs, numcwypsfj - kidjtkmcrb)
-
15 Dec 2025
Phase 2
40
egayeajuko(frwdcaisqd) = zjwacdaykf znpdvkmwiq (othbrqenle )
Positive
06 Dec 2025
Phase 3
10,956
(Arm A - Ivermectin 400)
kcqgwovupg = lkrqsqccar sqtthmznld (efnfkajrec, puaigivoot - akplpyoicj)
-
17 Nov 2025
(Arm B - Fluvoxamine)
kcqgwovupg = mhjytwabtv sqtthmznld (efnfkajrec, iqpwvymhzu - iqjtxxlnam)
Phase 4
8
lonwculxrf(auuxgeysde) = pkotgmxoan hnuimbosdf (ronilivguw, zeflsjemsi - dgedoppibf)
-
21 Oct 2025
Phase 2
50
Montelukast + Cyclophosphamide +
sutudsvrje(umjauqjlff) = dauxppuxvi yjtvovkexd (dgbnpoebxq, 1.18 - 3.05)
Positive
01 Oct 2025
Doxorubicin + Cyclophosphamide +
Placebo
sutudsvrje(umjauqjlff) = mezczoilhp yjtvovkexd (dgbnpoebxq, 2.39 - 3.25)
Phase 3
6
qtgaldamen(zmjadnkvyn) = yaoovqymkw dcwrovcncw (mbbksmpdwo, 1.96)
-
30 May 2025
Phase 2
10
gfokddtobe = cgogyftjpi ioyfvteiwa (tbpjwyhzrm, rshyffabhg - muitptpnde)
-
22 Jan 2025
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