Final answer:
Tranquilization therapy is the most common pharmaceutical therapy used in behavior modification, helping to alleviate anxiety and tension through sedative and hypnotic effects.
Step-by-step explanation:
Tranquilizers, such as diazepam and chlordiazepoxide, are medications that alleviate symptoms of anxiety and tension. They induce sedative and hypnotic effects, producing a calming sensation and drowsiness. Many psychiatric disorders are managed with psychoactive drugs; for instance, antidepressants like sertraline treat depression, while anxiolytics such as buspirone and diazepam are used for anxiety disorders. Antipsychotics like clozapine and mood stabilizers such as lithium are employed to treat conditions like schizophrenia and bipolar disorder. Hence, tranquilization therapy which utilizes drugs like benzodiazepines plays a significant role in behavior modification and management of various psychiatric conditions.