<unk>  or N-methyl--aspartate <unk>  is an amino<unk>  derivative that acts as a specific agonist at the<unk>  receptor mimicking the action of glutamate, the neurotransmitter which normally acts at that receptor. Unlike glutamate,<unk>  only binds to and regulates the<unk>  receptor and has no effect on other glutamate receptors (such as those for AMPA and kainate).<unk>  receptors are particularly important when they become overactive during, for example, withdrawal from alcohol as this causes symptoms such as agitation and, sometimes, epileptiform seizures.
N-Methyl-D-aspartic acid
Glutamate 
Acetylcholine
Serotonin
N-Acetylserotonin
Nitric oxide
Phenserine
Gamma-Hydroxybutyric acid