Here is what I found doing a quick search.
What happens if I overdose?
• Seek emergency medical attention.
• Symptoms of an Adderall overdose include restlessness, tremor, rapid breathing, confusion, hallucinations, panic, aggressiveness, nausea, vomiting, diarrhea, an irregular heartbeat, and seizures.
I don't know if the above is 100% accurate. Please take overdosing seriously and call 911.