The preservative in Oros which was sulphur dioxide used to cause problems for allergic children especially coughing.I believe that there is a different preservative used now but this may also affect allergic children.I am unable to find out the name of the present preservative.The powder form of Oros which needs to be mixed does not contain any preservatives.Dilute apple or pear juice or rooibos are good choices for your son.
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