Answer: serotonin
Explanation: Clozaril (clozapine) is an antipsychotic medication. It works by changing the actions of chemicals in the brain.
Clozaril is used to treat severe schizophrenia, or to reduce the risk of suicidal behavior in people with schizophrenia or similar disorders. Clozaril blocks neurotransmitters than secrete serotonin and cause have serious side effects for example developing diabetes.
In those with schizophrenia and schizoaffective disorder it may decrease the rate of suicidal behavior. It is more effective than typical antipsychotics, particularly in those who are treatment-resistant. It is used by mouth, or by injection into a muscle.
Clozapine is classified as an atypical antipsychotic drug because it binds to serotonin as well as dopamine receptors.
Clozapine is an antagonist at the 5-HT2A subunit of the serotonin receptor, putatively improving depression, anxiety, and the negative cognitive symptoms associated with schizophrenia.