NCIt definition : The d-threo-enantiomer of methylphenidate, a central nervous system stimulant, appearing
to block the reuptake of norepinephrine and dopamine into the presynaptic neuron,
increasing their availability in the extracellular space. The mechanism of action
in Attention Deficit Hyperactivity Disorder is unknown. (NCI);
Alternative definition : NCI-GLOSS: A substance being studied in the treatment of fatigue and nervous system
side effects caused by chemotherapy. It is a type of central nervous system stimulant.;