Yes, you need these neurotransmitters for proper neurologic function.
The S stands for serotonin and the N stands for norepinephrine and RI stands for reuptake inhibitor. So, obviously these drugs are supposed to work on both serotonin and norepinephrine. However, some literature uses SNRI to mean Selective Norepinephrine Reuptake Inhibitor, and this will work better on norepinephrine. Then you have the SSRI which is Selective Serotonin Reuptake Inhibitor, which works better on serotonin.
neutrotransmitters
Epinephrine, norepinephrine, dopamine, serotonin.
no serotonin is not a catecholamine. Catecholamines are dopamine, epinepherine and norepinepherine.
Norepinephrine and serotonin nuerotransmitters
dopamine, serotonin, and norepinephrine
Epinephrine & Norepinephrine (NE)
Effexor (venlafaxine) is an SNRI or serotonin norepinephrine reuptake inhibitor.
I believe they are stimulants.
SNRI is a class of antidepressants known better as Serotonin and Noradrenaline Reuptake Inhibitors. They increases (to some degree) the amount of serotonin and noradrenaline (norepinephrine) in the brain.
Cymbalta is not a MAOI. It is a selective serotonin and norepinephrine reuptake inhibitor (SNRI).
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.