While Adderall can indeed cause an increase in heart rate, his heart rate is normal for a 7 year old. The only thing here that concerns me is the "groggy". That would be unrelated and is sometimes a sign of a serious problem.
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Doctor (MD)
Emergency Physician for 20 years
30 mg a day is on the high end For a 42 lb child but not extraordinarily so. It does indeed significantly decrease appetite in many children. There are MANY possible causes of chest pain ; most in this age group are not serious.
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