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High throid hormone levels will be seen which can cause increased heart beat, sweating, tremors, diarrhoea
. The Doctors are observing him to see if any heart problems like cardiac arrest
which can occur if not treated properly. Best treatment is medicine like Propranolol
to reduce heart rate
and prevent cardiac arrhythmias. Also stomach wash should have been given within 4 hours of ingestion of tablets. He needs to be observed and ECG also taken regularly.