Hi, My son is 9 yrs old. He has been put on seroflo 50 since last 2 yrs. For the first year, he was on 2 puffs a day and the second year, the dose was reduced to 1 puff a day (before bedtime). I have had no chance to use Asthalin as SOS as doctor had prescribed but today the weather being very cold, I can hear him wheezing although he is wheezing comfortably with intermittent coughs. I have already given him 2+2 doses of Asthalin in a gap of 4 hours. My question to you is, how often can I give asthalin as SOS? I second question is, is my son going to be dependant on seroflow all his life?