Thank you for your query.
can be due to post nasal drip
is only advised during severe wheeze in a known asthmatic.Never start it without a doctors precription.
Cough in a child can be due to various reasons.
Please let a doctor auscultate the chest and make a diagnosis of the cough.The medication will follow his diagnosis.Till then you can give your child a nasal decongestant.
Consult your doctor if the problem persists.
If you have any further queries you are free to consult me.
Hope this answers your query.
Wishing a speedy recovery.
Have a nice day.