MONTELUKAST BELONGS TO LEUKOTRIENE ANTAGONISTS AND HAS THE FOLLOWING INTERACTION: PLASMA CONCENTRATION OF MONTELUKAST REDUCED BY PHENOBARBITAL, PRIMIDONE, ERYTHROMYCIN, THEOPHYLLINE.ITS PLASMA CONCENTRATION INCREASED BY ASPIRIN.
IT POSSIBLY INCREASES PLASMA CONCENTRATION OF THEOPHYLLINE. & ENHANCES ANTICOAGULANT EFFECT OF WARFARIN