psychotic disorders usually respond to antipsychotic
medications, which have dopaminergic antagonist
properties (Angrist et al., 1974). The resemblance in
many aspects between an amphetamine psychosis and
schizophrenia has made this compound a primary
psychotomimetic model agent in schizophrenia research.
As MA is widely used, MA psychosis is a common
psychiatric problem in many parts of the world. The
results of a recent survey have shown that the number
of amphetamine-type stimulant users, in particular
MA users, has surpassed those of opiate and cocaine
users combined (United Nations Office for Drug
Control and Crime Prevention, 2000). This leads to