Product Name: Montelukast sodium
CAS No.: 151767-02-1
Molecular Formula: C35H35ClNNaO3S
Molecular Weight: 608.18 g/mol
Appearance: White to off-white, hygroscopic powder
Purity: ≥ 98% to 99% (pharmaceutical raw material grade)
Solubility: Freely soluble in ethanol, methanol, and water; practically insoluble in acetonitrile

Product Description:
Montelukast sodium is an active pharmaceutical ingredient (API) used as a selective leukotriene receptor antagonist for treating asthma, allergic rhinitis, and bronchoconstriction. It is commonly known by the brand name Singulair and is a prescription oral medication classified as a leukotriene receptor antagonist (LTRA) used to prevent asthma attacks, manage allergies, and stop exercise-induced bronchoconstriction.

Uses:
- Asthma: Long-term control and prevention of asthma attacks in adults and children. Does not treat an acute asthma attack already in progress.
- Allergic Rhinitis: Relieves symptoms of seasonal and perennial hay fever, such as runny nose, sneezing, or itchy airways.
- Exercise-Induced Bronchoconstriction: Prevents narrowing of the airways triggered by exercise.

Pharmaceutical Applications:
- Formulations: Processed into oral tablets, chewable tablets, and oral granules
- Mechanism: Acts as a potent CysLT1 receptor antagonist to reduce airway inflammation and eosinophil infiltration
- Synthesis Precursors: Manufactured using precursor chemicals such as methylmagnesium chloride, thionyl chloride, and vinylmagnesium bromide

Full documentation (COA, GMP, COPP, etc.) available upon request.