Singulair (montelukast) for asthma

    Merck is introducing Singulair (montelukast) for asthma.

    It's a new leukotriene antagonist...similar to Accolate (zafirlukast).

    Some leukotrienes are potent bronchoconstrictors. In fact they used to be called "slow-reacting substance of anaphylaxis."

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