for mild persistent wheezer or for an allergic child wat is preferred ?? montelukast plain Vs montelukast with levocetrizine ?? most pharma companies are coming with combo only (in syrups) , few got montelukast plain in syrups.. most of the peadiatricians are using combo only ? any rationale in that ?

duration ?? i have seen children takin that for yrs.. comparing with low dose ICS i think montelukast theraphy is costly.. ur opinion pls