Does anybody have a chart that explain how the neurotransmitters interrelated? There are excitatory and inhibitory, correct? I read elsewhere here and on Wiki that GABA can be either. If you are giving it to somebody for which you want it to get rid of glutamate, but GABA becomes excitatory, isn't that bad? I didn't know histimine was an excitatory. Is Dopamine excitatory or inhibitory? How do you increase dopamine without increasing the 'eprhines too much? Which neurotransmitters affect the other ones?