Common tranquilizers include Thorazine, Haloperidol, diazepam, triazolam, Xanax, Ativan, Prosom and Klonopin. There are two categories of tranquilizers: minor (anti-anxiety) and major (neuroleptics).
Minor tranquilizers, which are also called anxiolytics or benzodiazepines, are prescribed for insomnia, panic attacks and anxiety. Anxiolytics may be addictive especially as the people build a tolerance to these drugs after long-term use, according to WebMD.
Major tranquilizers are used to treat the symptoms of mental disorders like schizophrenia and bipolar disorder as well as anxiety disorders like paralyzing social phobias and obsessive compulsive disorder. Major tranquilizers tend to work slower than minor tranquilizers. Schizophrenia symptoms like delusions may take one to two weeks to diminish after starting antipsychotic medication, according to the National Institute of Mental Health.