Question

Which drugs appear to produce therapeutic effects by blocking receptor sites for dopamine?

Answer 1

The drugs appear to produce therapeutic effects by blocking receptors sites for dopamine are the antipsychotic drugs.  Antipsychotic drugs are drugs that are used to treat symptoms of psychosis such as delusions, hallucinations, paranoia, or confused thoughts. they are used  in the treatment of schisophrenia, severe depression and severe anxiety. Additionally they are also useful at stabilizing episodes of mania in people with Bipolar disorder. 

Answer 2

The correct answer is c.antipsychotic drugs.
Drugs that block dopamine receptor sites are dopamine antagonist (antidopaminergic). Dopamine antagonists are a type of drugs which blocks dopamine receptors by receptor antagonism. Those antagonists are used as antipsychotics, so they have found use in treating schizophrenia, bipolar disorder, and stimulant psychosis. Also, they can be antiemetics used in the treatment of nausea and vomiting or used as anti-depressants.