University of Washington
Neurotransmitters and Neuroactive Peptides
Very good introduction to the role that these chemicals play in the nervous system.
University of Texas at Austin
University of Texas: Neurons and Neurotransmitters
A good description of how the neurotransmitters are involved in cell communication. Very good site.
PBS
Wnet: Thirteen: Pbs: Do All Drugs Affect the Brain Similarly?
Discusses the mechanism by which drugs effect the brain. Contains links which discuss other aspects of drug addiction.
Curated OER
Neurotransmitters and Neuroactive Peptides
Very good introduction to the role that these chemicals play in the nervous system.