Which atypical antipsychotic is known for its efficacy in treating schizophrenia and bipolar disorder?

Clozapine is recognized for its efficacy in treating both schizophrenia and bipolar disorder due to its unique pharmacological profile. It belongs to the class of atypical antipsychotics, which generally have a lower risk of extrapyramidal side effects compared to typical antipsychotics. Clozapine works by antagonizing various neurotransmitter receptors in the brain, particularly serotonin and dopamine receptors. This action helps to mitigate symptoms of schizophrenia, such as hallucinations and delusions, while also providing mood stabilization in bipolar disorder.

Clozapine is particularly noted for its effectiveness in treatment-resistant schizophrenia, where other medications have failed. Its ability to improve symptoms and enhance quality of life in patients with both schizophrenia and bipolar disorder has been well-documented in clinical studies.

The other drugs listed serve different purposes. Carbidopa is primarily used in Parkinson's disease to enhance the effectiveness of levodopa. Benztropine is utilized primarily for managing extrapyramidal symptoms that can occur with typical antipsychotic medications. Selegiline is also used in Parkinson's disease and as an adjunct treatment for depression but does not have direct efficacy in treating schizophrenia or bipolar disorder. Therefore, clozapine stands out as the correct choice for conditions like schizophrenia