hi joana.. thanks for ur query..
from the history it seems your child is having viral infection in which running nose is very common,
and taxim-o are proper medicines. as you know antibiotics take some time to act..
but for now to control coughing NEBULIZER
must be applied atleast twice daily for instant relief,
n avoid cetrizine
as it makes the secretions in lungs thick and worsen the cough..
i hope this will help you.. if u have anyother doubts or followup queries feel free to discuss with me..
i wish him a speedy recovery.