Yes, Benadryl at the recommended dose should take care of the hives. Do not give him any more amoxicillin. Tell your doctor what happened and be sure they make a note of the allergy in your son's file. Your doctor will prescribe an antibiotic from a different family, but still be allert for signs of allergy since it is common to be allergic to multiple medicines. I hope your son feels better soon!
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