Amphetamines should be administered at the lowest effective dosage, regardless of indication; dosage should be individually adjusted according to the therapeutic needs and response of the patient. Late evening doses should be avoided since they result in insomnia Usual dose is 5 mg to 60 mg per day in divided doses, depending on the individual patient response. The medication dextroamphetamine sulfate rarely occurs in children aged under 12 years, but it is used when it is reported.