my son is 7 and half months old, weighs 8kgs has cold and cough since 1 week and started on t-minin drops, o.7 ml twice daily from past 5 days and mucolite drops 0.7ml twice daily from past 3 days, but still the cold and cough persists.., his lungs seems to be clear as said by the doctor 2days back.., is it safe to continue these 2 drops for couple of more days, till his cold and cough is completely gone.