Hi dolphingal, (LONG...)
My 2 girls are also just recovering from really bad bad cough and bronchitis. Usu my pead gives also prospan and sinupret, reason bcoz the med is more gentle on the kids. It is effective for coughs that are mild or recovering. For my girl, the doc added on prenisolone(which is the all hailed cortisteriod), and antibiotics which I always try to avoid. But since this time, the airways r badly inflammed, got no choice. they r on it for 2 wks plus Ventolin.(oral /inhaled). At the same time, I went to Lor 8 Chong hoe medical hall to see sinseh Yap. Will continue w his med after the girls recover.
For yr boy, I think you have to give lots of warm water to drink, and no chicken, eggs, anything sweet. Usu they r recovering and when we forget, they eat something and the next day, the phelgm all comes back.
If possible ,even dilute the milk, (even soya causes phlegm).
hope this helps...... actually, flumucil is helpful, why not continue, half a pack twice a day for a week. once in morning, once at night. make sure you stir till everything dissolve.(this was the dosage when my girl was one yrs old..)