Antipsychotic Drugs:
They are Antagonists which which bind the dopamine receptors, mainly the D2 ones and do not stimulate them therefore they block the action. This discovery led to the formation of the dopamine hypothesis
An example of an typical Antipsychotic drug is Chlorpromazine
Atypical Anti-Psychotic drugs:
These sort of drugs also act on the dopamine system but also have an effect on serotonin by blocking the serotonin receptors in the brain. Clozapine is an Atypical anti-psychotic drug. These sort of drugs have been known to not harbour the same level of side effects such as tardive dyskensia.
Drug therapies have been shown to mainly help with the positive symptoms of schizophrenia, however Atypical drugs have had the possiblity of helping with some of the negative symptoms.
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