I believe they are stimulants.
neutrotransmitters
Epinephrine, norepinephrine, dopamine, serotonin.
dopamine, serotonin, and norepinephrine
Stops your drugs working and you go crazy.
Norepinephrine, dopamine, and serotonin have all been studied as causes of mania.
no serotonin is not a catecholamine. Catecholamines are dopamine, epinepherine and norepinepherine.
neutrotransmitters
Epinephrine, norepinephrine, dopamine, serotonin.
dopamine, serotonin, and norepinephrine
Stops your drugs working and you go crazy.
Norepinephrine, dopamine, and serotonin have all been studied as causes of mania.
Several chemicals affect emotions in the brain. The ones noted most in science are dopamine, nor-epinephrine, and serotonin.
Cymbalta is an antidepressant that is in the class of serotonin and norepinephrine inhibitor. Wellbutrin is also an antidepressant, but in the class of dopamine and norepinephrine reuptake inhibitors.
Chemicals like Paxil are in a class called SSRI (selective serotonin reuptake inhibitors). Basically, these drugs block the re-uptake of serotonin at the synaptic junction, so there is an overabundance of serotonin. Amphetamines tend to increase the amount of norepinephrine and dopamine at the synaptic junction, not through blocking the re-uptake (like cocaine) but by increasing the outflow from the presynaptic axon.
Though the mechanism of action of cocaine is not fully understood, it is thought to bind to and block the dopamine transporter protein (DAT). Blocking the action of this protein increases the concentration of dopamine in the synaptic cleft, thereby producing the characteristic effects of cocaine (such as stimulation and euphoria). Cocaine also affects serotonin receptors, sigma receptors, and sodium channels, though these actions play less of a role in its pharmacology.
They are postulated to be 1) excess secretion of dopamine, 2) deficiency of serotonin, and 3) deficiency of norepinephrine (among others).
The exact ones are not known for certain at this time. Some evidence indicates serotonin, dopamine, and norepinephrine may contribute.