Dr. My son is 5 year old. He has cough since Nov 2015. I had given antibiotics like amoxyclav and azithromycin and asthalin coriminic and cetrizine syp but no effect. All his blood test chest xray and afb test are normal. In chest xray he had mild cardiomegaly. Drs. Done echo whis is normal.In blood test his eosinophil are 11. Drs says he has allergy in blood and prescribe Montair 10 mg one tab in night for three months. Dr. My question is can I give 5 year old child Montelukast 10 mg or less dose like 5 mg montair. And can it is ok for three months.