Adderall, as well as many ADHD drugs, contains amphetamines, which stimulate the central nervous and cardiovascular systems.
Amphetamines can be very harmful or even deadly to cats, potentially causing hyperactivity, tremors and seizures, fever, abnormal heart rate and rhythm, coma and even death.
Suggestions
Keep your cats away from Adderall and other ADHD drugs.
Please consult your veterinarian immediately if your cats have ingested one of these medications.