A blocker of leukotriene D4 and E4 (LTD4 and LTE4) components of a slow-reacting substance of anaphylaxis (SRSA); used for the prophylaxis of asthma attacks.
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za·fir·lu·kast zə-'fir-lü-.kast, .za-fir-'lü n an anti-asthma drug C31H33N3O6S that is administered orally and tends to inhibit bronchoconstriction caused by certain allergenic substances
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n.
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za·fir·lu·kast (zə-firґloo-kast) a leukotriene receptor antagonist used as an antiasthmatic agent; administered orally.Medical dictionary. 2011.