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Montelukast sodium hydrate

≥98% (HPLC)

1-[[[(1R)-1-[3-[(1E)-2-(7-Chloro-2-quinolinyl)ethenyl]phenyl]-3-[2-(1-hydroxy-1-methylethyl)phenyl]propyl]thio]methyl]cyclopropaneacetic acid sodium salt hydrate
Empirical Formula (Hill Notation):
C35H35ClNO3S·Na · xH2O
Molecular Weight:
608.17 (anhydrous basis)
MDL number:
PubChem Substance ID:

Quality Level


≥98% (HPLC)



optical activity

[α]/D +90 to +106° in methanol (c=1)

storage condition



white to tan


DMSO: ≥8 mg/mL at 60 °C


Merck & Co., Inc., Kenilworth, NJ, U.S.

storage temp.


SMILES string




InChI key



Montelukast sodium hydrate has been used as a positive control drug to study the protective effects of Gumiganghwal-tang aqueous extract (GGTA) against airway inflammation and pulmonary fibrosis.


10, 50 mg in glass bottle

Biochem/physiol Actions

Montelukast sodium hydrate is a leukotriene receptor antagonist (LTRA) used for the maintenance treatment of asthma and to relieve symptoms of seasonal allergies. It is a subtype specific CysLT1 receptor antagonist.

Features and Benefits

This compound was developed by Merck & Co., Inc., Kenilworth, NJ, U.S.. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.
This compound is featured on the Leukotriene Receptors page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.
This compound is a featured product for ADME Tox research. Click here to discover more featured ADME Tox products. Learn more about bioactive small molecules for other areas of research at

Storage Class Code

13 - Non Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Hoang Kim Tu Trinh et al.
Prostaglandins, leukotrienes, and essential fatty acids, 141, 17-23 (2019-01-22)
Identification of the characterization of cysteinyl leukotrienes receptor (CysLTRs) could facilitate our understanding of these receptors' role in asthma. We aimed to investigate the localization and interactions of CysLTRs using a mouse model of asthma. BALB/c mice were administered ovalbumin
Aqueous extract of gumiganghwal-tang, a traditional herbal medicine, reduces pulmonary fibrosis by transforming growth Factor beta1/Smad signaling pathway in murine model of chronic Asthma
Jeon WY, et al.
Testing, 11(10), e0164833-e0164833 (2016)
Elisa Viciani et al.
Scientific reports, 6, 20609-20609 (2016-02-11)
The involvement of pathogenic bacteria in obstructive sleep apnoea syndrome (OSAS) has yet to be elucidated. We investigated the possible role of group A streptococcus (GAS) in OSAS pathogenesis. In 40 tonsillectomized patients affected by OSAS and 80 healthy controls
Rajesh Chavan et al.
Xenobiotica; the fate of foreign compounds in biological systems, 51(3), 251-261 (2020-10-21)
Nafithromycin is a next generation lactone ketolide antibiotic slated to enter phase III clinical development in India for the treatment of CABP as a shorter 800 mg-OD X3 day therapeutic regimen. Nafithromycin exhibits potent activity against MDR Streptococcus pneumoniae including erythromycin and
Michela Illiano et al.
Frontiers in oncology, 10, 799-799 (2020-06-26)
Acute myeloid leukemia (AML) is a progressive hematopoietic-derived cancer arising from stepwise genetic mutations of the myeloid lineage. cAMP response element-binding protein (CREB) is a nuclear transcription factor, which plays a key role in the multistep process of leukemogenesis, thus

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