Pediatric notes of JP Ferrara http://members.tripod.com/~uncljoedoc/index.html Asthma treatment of Zafirleukast-leukotriene receptor antagonist linked to Chrug Strauss phenomenon eosinophilia skin lesions worsening of asthma symptoms P450 system Zileution- lipoxygenase inhibitors also P450 system potentiates theophylline.