Used primarily in the synthesis of pharmaceuticals, particularly in the production of phenothiazine-based drugs. These drugs are widely employed in the treatment of psychiatric disorders, such as schizophrenia and bipolar disorder, due to their antipsychotic properties. Additionally, it serves as an intermediate in the development of antihistamines and antiemetics, which are used to manage allergies and prevent nausea and vomiting. Its derivatives are also explored for their potential in treating other medical conditions, including certain types of cancer and neurological disorders.