Verlukast is an (R)-enantiomer of MK-571 and a potent and selective LTD4 receptor antagonist. Verlukast showed [3H]leukotriene D4 binding in guinea-pig (IC50 = 3.1 +/- 0.5 nM) and human (IC50 = 8.0 +/- 3.0 nM) lung homogenates and dimethylsulfoxide diffe