Monoaminergics are a class of chemical substances that either directly or indirectly activate, modulate or enhance the activity of monoamine-based neurotransmitter systems. These systems include serotonin, dopamine, norepinephrine, and trace amine signaling systems. The monoaminergic group represents a large number of different chemical compounds with a variety of effects.
Eugeroics are a special class of chemical substances that exhibit wakefulness and alertness promoting effects through action on the central nervous system, yet which are also distinguished by exhibiting a low or very low addictive potential (unlike some other types of central nervous system stimulating compounds). Eugeroics are sometimes also considered to be potential cognitive enhancers or nootropics.