The only way to find out why your son has a hoarse voice is to ask an ENT specialist to examine him. There are many causes of hoarseness in young children especially those who have been on or had inhaled cortisone I would not give your son Allergex as it is an old fashioned sedating antihistamine that interferes with concentration and learning.
Allecet is a safe generic of Zyrtec and is reasonably well priced.
It would be worthwhile giving him Scotts emulsion as an immune booster. You will be able to stop the Omega 3 if he uses Scotts emulsion.
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