Overview
Montelukast is a widely prescribed leukotriene receptor antagonist developed for chronic management of asthma and seasonal allergies. It specifically targets the cysteinyl leukotriene type 1 receptor (CysLT1), inhibiting the inflammatory cascade that leads to bronchoconstriction. First approved by the FDA in 1998, it is marketed under the brand name Singulair and available as generics. As a maintenance medication, montelukast is not suitable for acute symptom relief but effectively reduces inflammation over time. Its oral bioavailability and once-daily dosing make it a convenient option for long-term therapy in patients aged 6 months and older.
Physical and Chemical Properties
Montelukast sodium is a hygroscopic white powder with a molecular weight of 608.18 g/mol. It demonstrates stability under normal storage conditions but degrades upon exposure to light or moisture. The compound's chiral center at the 1-position gives it stereospecific activity, with the (R)-enantiomer being the active form. Chemically, it features a quinoline backbone with a thioether linkage to a substituted phenyl group, contributing to its receptor-binding affinity. The solubility profile allows formulation as both immediate-release tablets and chewable pediatric variants, though absorption is affected by food intake.
Main Applications
The primary clinical use of montelukast is prophylactic treatment of persistent asthma, particularly in patients with aspirin-exacerbated respiratory disease (AERD). It reduces daytime and nighttime symptoms while decreasing reliance on inhaled corticosteroids. The drug is also indicated for allergic rhinitis, offering relief from sneezing, nasal congestion, and ocular symptoms. Off-label applications include adjunctive therapy for chronic urticaria and exercise-induced bronchoconstriction. Pediatric formulations (4mg and 5mg granules/chewables) address the need for age-appropriate dosing in children as young as 6 months, making it one of few asthma controllers approved for infants.
Safety and Storage
Montelukast carries a FDA black box warning for serious neuropsychiatric adverse effects including depression, suicidal ideation, and aggression—particularly in pediatric patients. Other common side effects include headache, abdominal pain, and elevated liver enzymes. It is contraindicated in acute asthma attacks and phenylketonuria patients (due to aspartame in chewable tablets). Proper storage requires protection from moisture and temperatures exceeding 25°C. Blister packaging maintains stability for up to 3 years from manufacture. Healthcare providers should monitor patients for behavioral changes and ensure proper disposal of expired medications.
B2B Procurement Guide
Pharmaceutical buyers should prioritize suppliers with WHO-GMP or equivalent certifications when sourcing montelukast API or finished dosage forms. Key procurement considerations include batch-to-batch consistency testing, impurity profiles (especially for genotoxic impurities), and documentation of polymorphic form (Form I is preferred). Current market prices fluctuate based on patent expirations and regional manufacturing capacity. Bulk API typically ranges between $800-$1,200/kg, while formulated products vary by dosage strength and packaging. Importers must verify COA, stability data, and regulatory filings for their target markets. Just-in-time inventory is recommended due to the drug's moisture sensitivity.
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