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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Chlorpromazine Hci
Generic Name
Chlorpromazine Hci
Active Ingredient
ChlorpromazineCategory
Other
Salt Form
Hydrochloride
Variants
3
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 25 mg/mL | INJECTION | INTRAMUSCULAR | 43598-140 |
| 25 mg/mL | INJECTION | INTRAMUSCULAR | 43598-141 |
| 25 mg/mL | INJECTION | INTRAMUSCULAR | 51662-1406 |
References used for this content
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Chlorpromazine Hci, you must consult a qualified healthcare professional.
Detailed information about Chlorpromazine Hci
Chlorpromazine is a prototype phenothiazine antipsychotic used to treat various psychiatric disorders, severe behavioral problems, and medical conditions like intractable hiccups or nausea.
Dosage for chlorpromazine is highly individualized and depends significantly on the condition being treated, the severity of symptoms, and the patient's overall health. Healthcare providers typically start with a low dose and gradually increase it (titration) to find the minimum effective dose.
Chlorpromazine is approved for use in children aged 6 months and older, though it is most commonly used in children over 2 years of age for specific indications.
While chlorpromazine is primarily metabolized by the liver, its metabolites are excreted by the kidneys. Patients with significant renal impairment should be monitored closely, and healthcare providers may consider lower starting doses to prevent the accumulation of metabolites.
Because the liver is the primary site of chlorpromazine metabolism, patients with liver disease (such as cirrhosis or hepatitis) are at a much higher risk of toxicity. Dosage should be initiated at the lowest possible level, and frequent monitoring of liver function tests is essential.
Geriatric patients are often more sensitive to the sedative and hypotensive effects of chlorpromazine. Healthcare providers typically use doses that are 1/2 to 1/3 of the standard adult dose. There is also an increased risk of tardive dyskinesia and other movement disorders in this population.
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and return to your regular dosing schedule. Do not take two doses at once to make up for a missed one, as this increases the risk of severe side effects.
Signs of a chlorpromazine overdose may include extreme drowsiness, irregular heartbeat, fainting, muscle stiffness, tremors, and agitation. In severe cases, an overdose can lead to coma or seizures. If an overdose is suspected, contact emergency medical services or a poison control center immediately. Emergency treatment often involves gastric lavage (stomach pumping) and supportive care to maintain breathing and heart function.
> Important: Follow your healthcare provider's dosing instructions exactly. Do not adjust your dose or stop taking the medication without medical guidance, as sudden discontinuation can cause withdrawal symptoms.
Chlorpromazine is associated with several common side effects that often occur during the initial weeks of treatment as the body adjusts to the medication. These include:
Chlorpromazine is a potent medication that requires careful medical supervision. It can significantly impair mental and physical abilities, especially during the initiation of therapy. Patients must be aware that the full therapeutic effect for psychiatric conditions may take several weeks to manifest, and they should not discontinue the drug abruptly without consulting their healthcare provider.
Increased Mortality in Elderly Patients with Dementia-Related Psychosis: Clinical trials have shown that elderly patients with dementia-related psychosis who are treated with antipsychotic medications, including phenothiazines like chlorpromazine, face a significantly higher risk of death compared to those receiving a placebo. Chlorpromazine is not indicated for the treatment of psychosis associated with dementia, and healthcare providers should consider alternative treatments for this population.
Certain medications should never be used in combination with chlorpromazine due to the risk of life-threatening complications:
Chlorpromazine must NEVER be used in the following circumstances:
Chlorpromazine is classified by the FDA as Pregnancy Category C. This means that animal studies have shown adverse effects on the fetus, but there are no adequate and well-controlled studies in humans.
Chlorpromazine is excreted into human breast milk. Because of the potential for serious adverse reactions in nursing infants (such as extreme lethargy or developmental delays), a decision should be made whether to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother. Most clinical guidelines suggest that if a mother must take chlorpromazine, the infant should be closely monitored for sedation and developmental milestones.
Chlorpromazine is a multi-receptor antagonist. Its primary antipsychotic effect is derived from its high affinity for Dopamine D2 receptors in the limbic system and basal ganglia. By blocking these receptors, it reduces excessive dopaminergic activity, which is hypothesized to be the cause of 'positive' psychotic symptoms.
Beyond dopamine, it acts as an antagonist at:
Common questions about Chlorpromazine Hci
Chlorpromazine is a versatile medication primarily used to treat symptoms of schizophrenia and other psychotic disorders. It is also frequently prescribed for the manic phase of bipolar disorder to help stabilize mood and reduce agitation. Beyond mental health, it is FDA-approved for treating severe nausea and vomiting, as well as intractable hiccups that have not responded to other treatments. In some cases, it is used before surgery to help patients feel less anxious and more relaxed. Because it is a powerful medication, it is only used for these conditions under strict medical supervision.
The most common side effects of chlorpromazine include significant drowsiness, dry mouth, and blurred vision, which are often most noticeable when starting the medication. Many patients also experience weight gain and constipation due to the drug's effect on metabolism and digestion. Dizziness when standing up (orthostatic hypotension) is also frequent, increasing the risk of falls. While many of these effects lessen as the body adjusts, some may persist throughout treatment. It is important to discuss any bothersome side effects with a healthcare provider rather than stopping the medication abruptly.
No, you should strictly avoid alcohol while taking chlorpromazine. Alcohol is a central nervous system depressant that, when combined with chlorpromazine, can lead to dangerous levels of sedation and respiratory depression. This combination significantly increases the risk of accidental injury, fainting, and even life-threatening overdose. Alcohol can also worsen the liver-related side effects that chlorpromazine sometimes causes. Always consult your doctor before consuming any substances that might affect your coordination or alertness while on this medication.
Chlorpromazine is generally not recommended during pregnancy unless the benefits to the mother clearly outweigh the risks to the fetus. Exposure to the drug during the third trimester has been linked to withdrawal symptoms and movement disorders in newborns, such as tremors or muscle stiffness. There is limited data on its long-term effects on child development, so it is classified as Pregnancy Category C. If you are pregnant or planning to become pregnant, you must have a detailed discussion with your healthcare provider. They will help you weigh the risks of the medication against the risks of untreated psychiatric illness.
The time it takes for chlorpromazine to work depends on the condition being treated. For acute issues like nausea, vomiting, or hiccups, the medication often begins to work within 30 to 60 minutes after an oral dose. However, for psychiatric conditions like schizophrenia, while some sedation may occur immediately, the full antipsychotic benefits typically take 2 to 4 weeks of consistent use to appear. In some cases, it may take up to 6 weeks to see the maximum therapeutic effect. It is crucial to continue taking the medication as prescribed, even if you do not feel better right away.
You should never stop taking chlorpromazine suddenly without first consulting your healthcare provider. Abruptly discontinuing the medication can cause withdrawal symptoms such as nausea, vomiting, dizziness, and physical tremors. More importantly, stopping the drug suddenly can lead to a rapid and severe return of the symptoms for which the drug was originally prescribed, such as hallucinations or mania. If you need to stop the medication, your doctor will provide a schedule to gradually reduce your dose. This tapering process helps your brain and body adjust safely.
If you miss a dose of chlorpromazine, take it as soon as you remember to maintain consistent levels in your bloodstream. However, if it is almost time for your next scheduled dose, you should skip the missed dose and simply take the next one at the regular time. Never take two doses at the same time to 'catch up,' as this significantly increases your risk of experiencing serious side effects or toxicity. If you frequently miss doses, consider using a pill organizer or setting a daily alarm. Consistency is key to the effectiveness of this medication.
Yes, weight gain is a well-documented side effect of chlorpromazine and many other older antipsychotic medications. The drug can increase appetite and cause changes in how your body processes sugars and fats, leading to metabolic shifts. Some patients may gain a significant amount of weight over several months of treatment. To manage this, healthcare providers often recommend monitoring your weight regularly and following a balanced diet and exercise routine. If weight gain becomes a major concern, your doctor may evaluate your metabolic health or consider alternative treatments.
Chlorpromazine has many potential drug interactions, some of which can be very serious. It should not be taken with other drugs that cause drowsiness, such as opioids or sleep aids, or with medications that affect the heart's rhythm. It can also interact with common over-the-counter medicines for colds or allergies. Because it affects so many different receptors in the brain, it is vital that your doctor knows every single medication and supplement you are taking. They will check for 'contraindications' to ensure your treatment plan is safe and effective.
Yes, chlorpromazine is widely available as a generic medication, which is typically much more affordable than brand-name versions. The generic form, Chlorpromazine Hydrochloride, is bioequivalent to the original brand (Thorazine), meaning it has the same active ingredient and works the same way in the body. It is available in various strengths and forms, including tablets and injections. Most insurance plans cover the generic version of this medication. You can discuss with your pharmacist or doctor to ensure you are receiving the most cost-effective version of your prescription.
Other drugs with the same active ingredient (Chlorpromazine)
> Warning: Stop taking Chlorpromazine and call your doctor immediately if you experience any of these serious conditions.
Prolonged use of chlorpromazine can lead to chronic metabolic issues, including an increased risk of developing Type 2 diabetes and high cholesterol. Additionally, the risk of Tardive Dyskinesia increases the longer a patient remains on the medication. Regular 'skin and eye' exams are recommended for those on high-dose, long-term therapy to monitor for pigmentary changes in the skin or lens opacities.
Increased Mortality in Elderly Patients with Dementia-Related Psychosis: The FDA has issued a black box warning stating that elderly patients with dementia-related psychosis treated with antipsychotic drugs are at an increased risk of death. Most deaths appeared to be cardiovascular (e.g., heart failure, sudden death) or infectious (e.g., pneumonia) in nature. Chlorpromazine is NOT approved for the treatment of patients with dementia-related psychosis.
Report any unusual symptoms or changes in mood/behavior to your healthcare provider immediately.
To ensure safety while taking chlorpromazine, healthcare providers will typically order regular diagnostic tests:
Chlorpromazine causes significant drowsiness and can slow reaction times. Patients should not drive, operate heavy machinery, or engage in potentially dangerous activities until they are certain that the medication does not impair their ability to do so safely.
Alcohol must be strictly avoided while taking chlorpromazine. Alcohol significantly enhances the CNS depressant effects of the medication, leading to extreme sedation, respiratory depression, and an increased risk of accidental injury or overdose.
Stopping chlorpromazine suddenly can lead to 'withdrawal emergent' symptoms, including nausea, vomiting, dizziness, and tremors. It may also cause a rapid return of psychotic symptoms. Healthcare providers will always recommend a gradual tapering of the dose over several weeks or months to ensure a safe transition.
> Important: Discuss all your medical conditions, including any history of heart, liver, or kidney disease, with your healthcare provider before starting Chlorpromazine.
Chlorpromazine can interfere with certain medical tests, leading to false results:
For each major interaction, the management strategy usually involves either avoiding the combination, adjusting the dosage, or performing frequent clinical monitoring.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including over-the-counter cold or allergy medicines.
In these situations, the healthcare provider must carefully weigh the benefits against the potential risks:
There is a high degree of cross-sensitivity among the phenothiazine class. If a patient has experienced cholestatic jaundice, skin rashes, or blood disorders while taking another phenothiazine medication, they are at a significantly increased risk of experiencing the same reaction with chlorpromazine. Patients should always inform their healthcare provider of any past adverse reactions to psychiatric or anti-nausea medications.
> Important: Your healthcare provider will evaluate your complete medical history, including any underlying physical conditions, before prescribing Chlorpromazine.
While chlorpromazine is used in children for severe behavioral problems and nausea, it is not generally recommended for children under 6 months of age. In older children, it should be used with caution as they may be more susceptible to neuromuscular reactions (dystonias). There is also concern that the drug's sedative effects could interfere with learning and school performance. Long-term effects on growth and development in children have not been extensively studied.
As noted in the Black Box Warning, elderly patients with dementia are at an increased risk of death. Even in elderly patients without dementia, chlorpromazine is associated with a high risk of falls due to sedation and orthostatic hypotension. The 'Beers Criteria' for potentially inappropriate medication use in older adults lists chlorpromazine as a drug to avoid or use with extreme caution. Age-related declines in liver and kidney function also mean that the drug stays in the system longer, increasing the risk of toxicity.
In patients with kidney disease, the excretion of chlorpromazine metabolites is delayed. While the parent drug is metabolized by the liver, the accumulation of metabolites can lead to increased side effects. Healthcare providers typically use a 'start low, go slow' approach for patients with a GFR (Glomerular Filtration Rate) below 60 mL/min.
Chlorpromazine is contraindicated or used with extreme caution in patients with active liver disease. In patients with chronic hepatic impairment (Child-Pugh Class B or C), the drug's half-life is significantly prolonged, and the risk of drug-induced coma or encephalopathy is elevated. Frequent monitoring of liver enzymes is mandatory in this population.
> Important: Special populations require individualized medical assessment and frequent follow-up with a healthcare provider to ensure safety and efficacy.
| Parameter | Value |
|---|---|
| Bioavailability | 25% - 35% (Extensive first-pass metabolism) |
| Protein Binding | 92% - 97% (Primarily Albumin) |
| Half-life | 24 - 31 hours (Highly variable) |
| Tmax (Oral) | 1.5 - 4 hours |
| Metabolism | Hepatic (CYP2D6, CYP1A2, CYP3A4) |
| Excretion | Renal (Metabolites) and Biliary/Fecal |
Chlorpromazine is the prototype of the Phenothiazine class of typical antipsychotics. It is specifically categorized as a 'low-potency' agent, meaning it requires higher milligram doses to achieve the same D2 blockade as 'high-potency' agents like haloperidol, but it carries a higher risk of sedation and anticholinergic effects and a slightly lower (though still significant) risk of acute extrapyramidal symptoms.