Psychochemical is a term that describes the effects of chemicals or drugs on the brain, particularly with regard to behavior and mental health. There are several synonyms for psychochemical that capture the same meaning, such as psychotropic, neuromodulatory, and psychoactive. These terms all describe substances that alter brain function or behavior. Other related words include psychopharmacological, which refers to the study of how drugs affect mental health and diseases, and pharmacopsychological, which describes the intersection between pharmacology and psychology. The use of these terms highlights the complex relationship between chemicals and behavior, and the importance of understanding how drugs affect the brain.