Thorazine (chlorpromazine) is an antipsychotic medication primarily used to treat schizophrenia and other psychotic disorders. It was the first antipsychotic ever developed, synthesized in 1950, and it remains in use today for a surprisingly wide range of conditions, from severe nausea to hiccups that won’t stop.
Schizophrenia and Psychotic Disorders
The primary use of Thorazine is managing symptoms of schizophrenia, including disturbed thinking, hallucinations, delusions, and withdrawal from everyday life. It works by blocking dopamine receptors in the brain, which helps reduce the intensity of psychotic symptoms. Before chlorpromazine arrived in the 1950s, people diagnosed with schizophrenia often spent the rest of their lives in psychiatric hospitals. The drug made symptoms manageable enough that many patients could live outside institutional care for the first time, a shift that helped drive the deinstitutionalization movement of the 1960s and 1970s.
Thorazine is also used to treat the manic episodes of bipolar disorder, where a person experiences an abnormally elevated mood, racing thoughts, and impulsive behavior. In these situations, it helps bring the intensity of mania down to a level where the person can function and engage with other treatments.
Nausea, Vomiting, and Intractable Hiccups
Beyond psychiatry, Thorazine has a well-established role in controlling severe nausea and vomiting. Its ability to block certain chemical signals in the brain’s vomiting center makes it effective when other anti-nausea treatments fall short.
One of its more unusual uses is for intractable hiccups, meaning hiccups that have persisted for a month or longer. This is not a trivial problem. Chronic hiccups can interfere with eating, sleeping, and breathing, and Thorazine is one of the few medications specifically approved for this condition.
Behavioral Problems in Children
Thorazine is approved to treat severe behavioral problems in children ages 1 to 12, particularly explosive aggression and hyperactivity that hasn’t responded to other approaches. This use is generally reserved for situations where behavior is disruptive enough to significantly impair the child’s daily life, and the potential benefits outweigh the medication’s side effect profile.
Less Common Uses
Thorazine has several additional approved uses that reflect its broad effects on the nervous system:
- Acute intermittent porphyria: A condition where certain natural substances build up in the body and cause severe abdominal pain, anxiety, and confusion. Thorazine relieves both the pain and the neurological symptoms. Research published in JAMA described it as “the most consistently effective remedy thus far available for the pain and nervous manifestations of porphyria,” noting that the drug appeared to interrupt a cycle of worsening symptoms and allow patients to return to remission on their own.
- Preoperative restlessness: Thorazine is sometimes given before surgery to reduce anxiety and nervousness, contributing to a smoother induction of anesthesia.
- Tetanus: It can be used alongside other medications to help manage the severe muscle spasms caused by tetanus infection.
How It Compares to Newer Antipsychotics
Thorazine belongs to the first generation of antipsychotic drugs, sometimes called “typical” antipsychotics. Since its introduction, dozens of newer medications have been developed. A large systematic review comparing chlorpromazine against 43 other antipsychotics across 128 clinical trials found that only four drugs (including clozapine and olanzapine) were clearly more effective, and four others were clearly less effective. For the remaining 28 antipsychotics tested, there was no statistically significant difference in how well they worked.
That said, the review also noted that most of these comparisons involved very small numbers of participants (a median of just 50 per trial), meaning the older research was often too underpowered to draw firm conclusions. In practice, newer “atypical” antipsychotics are generally tried first today because they tend to carry a lower risk of certain movement-related side effects, though they come with their own trade-offs like weight gain and metabolic changes.
Side Effects to Know About
The most distinctive side effects of Thorazine involve involuntary movements, collectively called extrapyramidal symptoms. These can show up in several ways: sudden muscle contractions (dystonia), a persistent sense of restlessness that makes it hard to sit still, or stiffness and tremor resembling Parkinson’s disease. These effects are generally dose-related, meaning higher doses carry greater risk.
The most concerning movement side effect is tardive dyskinesia, a condition involving repetitive, involuntary movements, often of the face, tongue, or jaw. The risk increases with longer treatment duration and higher total lifetime doses. Elderly patients, especially women, appear to be at the highest risk, though it can develop even after relatively brief treatment at low doses. In some cases, tardive dyskinesia becomes permanent even after the medication is stopped.
Thorazine can also cause drowsiness, dry mouth, constipation, blurred vision, and drops in blood pressure, particularly when standing up quickly. It increases sensitivity to sunlight, so sunburn happens more easily.
A Critical Safety Warning for Older Adults
Thorazine carries a boxed warning (the most serious type of safety alert) regarding elderly patients with dementia-related psychosis. Older adults with dementia who take antipsychotic medications face roughly 1.6 to 1.7 times the risk of death compared to those taking a placebo. In clinical trials lasting about 10 weeks, the death rate was approximately 4.5% in patients taking antipsychotics versus 2.6% in the placebo group, with most deaths attributed to cardiovascular events or infections like pneumonia. Thorazine is not approved for treating psychosis related to dementia.