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Chlorpromazine

Chlorpromazine, a well-known antipsychotic medication, is being investigated in several clinical trials for potential new therapeutic uses beyond its traditional psychiatric applications. These trials are exploring chlorpromazine’s effects in treating conditions like COVID-19, glioblastoma (a type of brain cancer), and painful blind eyes, as well as examining its pharmacological properties. This research aims to repurpose chlorpromazine and potentially expand its clinical utility.

Table of Contents

What is Chlorpromazine?

Chlorpromazine is a medication that has been used for over half a century in the treatment of various medical conditions[1]. It is known by several other names, including Largactil, Thorazine, Neurazine, and Amplictil[2][3]. Chlorpromazine belongs to a class of drugs called antipsychotics, which are primarily used to manage mental health disorders[1].

Uses of Chlorpromazine

Chlorpromazine is used to treat a wide range of conditions, including:

  • Schizophrenia and other psychotic disorders: It helps manage symptoms such as hallucinations, delusions, and disorganized thinking[4].
  • Manic episodes in bipolar disorder[4].
  • Nausea and vomiting: It can help control severe cases of these symptoms[4].
  • Pre-surgery anxiety: It may be used to relieve restlessness and apprehension before surgical procedures[4].
  • Acute intermittent porphyria: A rare inherited blood disorder[4].
  • Tetanus: As an adjunct (additional) treatment[4].
  • Intractable hiccups: For cases that don’t respond to other treatments[4].

Additionally, chlorpromazine is being studied for potential use in other conditions, such as COVID-19 and certain types of cancer[2][1].

How Chlorpromazine Works

Chlorpromazine primarily works by blocking a specific type of receptor in the brain called dopamine D2 receptor[1]. Dopamine is a neurotransmitter (a chemical messenger in the brain) that plays a role in various brain functions, including mood, motivation, and perception. By blocking these receptors, chlorpromazine can help reduce symptoms associated with conditions like schizophrenia.

In addition to its effects on dopamine, chlorpromazine has several other actions in the body that contribute to its various uses:

  • It can affect other neurotransmitters, which may contribute to its anti-nausea effects.
  • It has sedative properties, which can help with anxiety and agitation.
  • It may have effects on certain cellular processes, which is why it’s being studied for potential use in cancer treatment[1].

Administration and Dosage

Chlorpromazine can be administered in several ways, depending on the condition being treated and the patient’s needs:

  • Oral tablets: This is the most common form. The dosage can vary widely depending on the condition being treated and the individual patient[2].
  • Intravenous (IV) injection: This may be used in hospital settings for acute situations[2].
  • Intramuscular injection: Sometimes used for severe nausea or vomiting.
  • Retrobulbar injection: A specialized use for managing pain in blind, painful eyes[3].

The dosage of chlorpromazine can vary significantly depending on the condition being treated, the patient’s age, and other factors. It’s crucial to take chlorpromazine exactly as prescribed by your healthcare provider[2].

Potential Side Effects

Like all medications, chlorpromazine can cause side effects. Some of the potential side effects include:

  • Drowsiness or sedation
  • Dry mouth
  • Blurred vision
  • Constipation
  • Weight gain
  • Low blood pressure, especially when standing up quickly
  • Sensitivity to sunlight
  • Movement disorders (e.g., tremors, stiffness)

In rare cases, more serious side effects can occur. It’s important to discuss all potential side effects with your healthcare provider and report any unusual symptoms promptly[2].

Ongoing Research

Researchers are continually studying chlorpromazine to understand its full potential. Some areas of current research include:

  • COVID-19 treatment: Studies are investigating whether chlorpromazine could help treat COVID-19 by potentially interfering with the virus’s ability to enter cells[2].
  • Cancer treatment: Some research is exploring whether chlorpromazine could be helpful in treating certain types of brain cancer, such as glioblastoma[1][5].
  • Pain management: Researchers are studying its use in managing certain types of eye pain[3].

It’s important to note that these are areas of ongoing research, and chlorpromazine is not currently approved for these uses. Patients should not use chlorpromazine for these conditions unless under the direct supervision of a healthcare provider in a clinical trial setting.

Condition Study Type Chlorpromazine Use Key Outcomes Measured
COVID-19 Randomized controlled trial Added to standard treatment Illness severity, clinical improvement, hospital stay time
Glioblastoma Phase I trial Combined with standard chemoradiation Safety, toxicity, progression-free survival
Painful blind eye Comparative study Retrobulbar injection Pain reduction, intraocular pressure changes
Pediatric sedation Comparative study Intravenous administration Sedation success, procedure duration, side effects
Neonatal abstinence syndrome Randomized controlled trial Oral administration Duration of treatment, incidence of convulsions
Pharmacokinetics Bioequivalence study Oral tablet Drug concentration in blood over time

FAQ

  • What is chlorpromazine? Chlorpromazine is an antipsychotic medication that has been used for over half a century to treat psychiatric disorders. It works by blocking dopamine receptors in the brain.
  • What new uses for chlorpromazine are being studied? Clinical trials are investigating chlorpromazine for treating COVID-19, glioblastoma (a type of brain cancer), painful blind eyes, and neonatal abstinence syndrome. It's also being studied in combination with standard glioblastoma treatments.
  • How is chlorpromazine being tested for COVID-19? A trial is evaluating if adding chlorpromazine to standard COVID-19 treatment can reduce illness severity, improve clinical outcomes, and reduce the need for ventilator support in hospitalized patients.
  • What is being studied about chlorpromazine in glioblastoma treatment? Researchers are examining if adding chlorpromazine to standard glioblastoma treatment (surgery, radiation, and chemotherapy) can improve outcomes. They're assessing its safety, proper dosing, and effects on survival rates.
  • Are there any non-psychiatric uses of chlorpromazine currently being explored? Yes, chlorpromazine is being studied for managing pain in blind eyes, as a sedative for children undergoing imaging procedures, and for treating neonatal abstinence syndrome in newborns exposed to opiates before birth.

Ongoing Clinical Trials on Chlorpromazine

  • Study on Continuing or Reducing Antipsychotic Medication (Haloperidol, Clozapine, Tiapride) for Patients After First Episode of Psychosis

    Not recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    The Netherlands

Glossary

  • Bioequivalence: The property of two drug products having the same effect in the body in terms of how much of the drug reaches the bloodstream and how quickly.
  • Glioblastoma multiforme: An aggressive type of cancer that occurs in the brain or spinal cord.
  • Neonatal abstinence syndrome: A group of problems that occur in a newborn who was exposed to addictive drugs while in the mother's womb.
  • Pharmacokinetics: The study of how a drug moves through the body, including how it is absorbed, distributed, metabolized, and excreted.
  • Repurposing: The process of finding new uses for existing drugs.
  • Bioavailability: The proportion of a drug that enters the circulation when introduced into the body and so is able to have an active effect.
  • Dose-limiting toxicity: Side effects of a drug that are severe enough to prevent an increase in dosage.
  • Progression-free survival: The length of time during and after treatment that a patient lives with the disease but it does not get worse.
  • Overall survival: The length of time from either the date of diagnosis or the start of treatment that patients are still alive.
  • MGMT gene: A gene that produces a protein involved in DNA repair. Its status can affect how well certain brain tumors respond to treatment.

References

  1. https://clinicaltrials.gov/study/NCT04224441
  2. https://clinicaltrials.gov/study/NCT04366739
  3. https://clinicaltrials.gov/study/NCT01404364
  4. https://clinicaltrials.gov/study/NCT02943213
  5. https://clinicaltrials.gov/study/NCT05190315