Which of the following is NOT a class of antipsychotics?

Beta-blockers are not a class of antipsychotics. They belong to a different category of medications primarily used to manage cardiovascular conditions, such as hypertension, anxiety, and heart rhythm disorders. Beta-blockers work by blocking the effects of epinephrine (adrenaline) on beta receptors, which decreases heart rate and blood pressure.

In contrast, thioxanthenes, dibenzodiazepines, and phenothiazines are all recognized classes of antipsychotic medications. Thioxanthenes are used in the treatment of psychotic disorders and have properties similar to phenothiazines. Dibenzodiazepines also have antipsychotic effects but are a more specific subgroup within the broader classification of benzodiazepines. Phenothiazines represent one of the earliest classes of antipsychotics, effective in managing symptoms of schizophrenia and other psychotic disorders by blocking dopamine receptors in the brain. These distinctions clarify the role and classification of each medication type, confirming that beta-blockers do not belong to the antipsychotic category.