question: My son, 11 y/o, coughs hard in the middle night for about more than 3 weeks now. A pediatrician said my son has an allergy. She gave him a prescription of co-amoxiclav for 1 week and 5 tablets of cetirizine for 5 days. My son finished the prescribed medicine but he still coughs hard in the middle of the night. He doesnt have any known allergies before.