I want to know, is the strength of Advair similar to that of an antibiotic? Should it also go by the age and weight as well or is it by the symptoms than these effects? I was curious to know whether the increase in dosage is ok or not. My six year old daughter’s dosage was increased to 250/50. I thought that this sounded like a lot dosage than her body could take. It is more than double the quantity of Fluticasone Propionate she was taking with 100/50 dosage. Also, I am really thrilled by the results as it has been very effective and has helped a lot in curbing the disease of my daughter. I have seen the results of these medicines with my own eyes but I am curious and at the same time about the dosage that she could take without any effect on her health.