montelukast

noun
mon·te·lu·kast | \ ˌmänt-ə-ˈlü-ˌkast \

Medical Definition of montelukast 

: a leukotriene antagonist used orally in the form of its sodium salt C35H35ClNNaO3S to treat asthma or to relieve the symptoms of seasonal allergic rhinitis — see singulair

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