Hello Read this very carefully and you will get the desired answer for your son. ASTHMA :Airways hyperresponsiveness that is secondary to inflammatory airways disease that results in recurrent or chronic episodes of WHEEZE, SHORTNESS of BREATH(SOB0, CHEST TIGHTNESS &/or COUGH particularly at night or in the early morning ( your son is having all these symptoms including hoarseness of voice , may be due to laryngeal edema ( side effect of prednisolone or inflammation of larynx). Pollen , dust ( fine dusting powder) mist , molds ,pests ( cockroaches ) , fumes , smoking ( active and passive ) , sudden chance of temperature ( increase or decrease ) , as all these are predisposing factors which triggers asthmatic attack. If possible avoid these . When such patient visit my clinic I prescribe Montelukast+bambuterole tablet once or twice in day . dosage are 0.2 mg of / kg body weight of each tablet . Hot coffee and steam inhalation provide instant relief as these acts as bronchodilators. I never prescribe PREDNISOLONE my patient .This is only meant for serious cases .