I realize how worried you are about hydroxychloroquine taken by your son. This medication is used to prevent and treat Malaria, also in Lupus and Rheumatoid Arthritis.
Children can be especially sensitive to an overdose, 2 pills might be enough to cause serious consequences. However this would depend on his weigh, more than 10mg/Kg can be enough to cause some complications. I would suggest you to consider this a potential toxic dose and watch for signs of alert such as irritation which could be shown as intense crying, abdominal pain and vomits. He would need to be observed by a health care provider for 4-6 hours.
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