Final answer:
Amphetamines are NET, DAT, and SERT inhibitors that act as indirect sympathomimetics by releasing catecholamines, which are used to treat ADD by enhancing neurotransmission in the brain.
Step-by-step explanation:
The NET, DAT, and SERT inhibitor that functions as an indirect sympathomimetic and releases catecholamines to treat Attention Deficit Disorder (ADD) is a class of medications known as amphetamines. These drugs serve to increase neurotransmitter activity within areas of the brain like the prefrontal cortex and basal ganglia that are associated with impulse control and attention regulation. Amphetamines achieve this by blocking the reuptake of neurotransmitters such as dopamine, norepinephrine, and serotonin, and by stimulating their release, thus enhancing neurotransmission and alleviating symptoms of ADD.