hello As you have said your son is a patient of asthma, using montair with fluticazone spray to control the symptoms. usually there are very less chances of fluticasone side effects . Asthma is in your child genes and will relapse and remit , meaning it will come and go on different times mostly asthmas of childhood disappear in adolance. so dont worry it will go away as he will grow keep him away from dust , check for his allergy against different things, observe him, avoid cold or hhot things that aggravate his condition Stop using fluticasone and call your doctor at once if you have a serious side effect such as: weakness, tired feeling, nausea, vomiting, feeling like you might pass out; skin rash, bruising, severe tingling, numbness, pain, muscle weakness; blurred vision, eye pain, or seeing halos around lights; signs of infection such as fever, chills, sore throat, ear pain, flu symptoms; wheezing or breathing problems after using this medication; or worsening asthma symptoms. Less serious side effects of fluticasone may include: headache; dryness in your mouth, nose, or throat; white patches or sores inside your mouth or on your lips; stuffy nose, sinus pain, cough; or hoarseness or deepened voice. take care