my son 2 years old was diagnosed with allergic rhinosinusitis in india. he was put on montair-4 for 2 months. due to change of location a month ago he was given duet syrup, Ventorlin, Zyrtec ,omnacortil by another doctor when he had severe cold,cough and air block. Now we are in singapore and he has running nose and sneezing,can we give him alaspan as this was prescribed before and was effective.