
Clozapine is an antipsychotic medicine used to treat schizophrenia and reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders. It is also used to treat bipolar and schizoaffective disorders. Clozapine has strong sedative properties and has been found to improve sleep continuity, increase total sleep time, and reduce insomnia in patients with schizophrenia. However, it is not a sleeping pill and is associated with several side effects, including drowsiness, blurred vision, and convulsions. It can also cause severe or life-threatening decreases in white blood cell counts, increasing the risk of serious infections.
| Characteristics | Values |
|---|---|
| Drug Type | Antipsychotic |
| Generic Name | Clozapine |
| Brand Names | Clozaril, FazaClo, Versacloz, Clopine, CloZAPine Synthon, Denzapine, Zaponex |
| Drug Class | Atypical Antipsychotics |
| Use | Treatments for schizophrenia, schizoaffective disorder, recurrent suicidal behaviour, psychosis in Parkinson's disease |
| Availability | Only from a certified pharmacy under a special program |
| Side Effects | Serious heart problems, seizures, low blood pressure, tachycardia, blurred vision, significant weight gain, dizziness, hypersalivation, constipation, myocarditis, hyperglycemia, gastric hypomotility syndrome, bowel obstruction, death, extreme tiredness, fever, sore throat, chills, flu-like symptoms, swollen legs, ankles or feet, difficulty breathing, fast breathing, chest pain, sudden dizziness, fainting, slow or irregular heartbeat, abdominal pain, mouth or throat sores, wounds that take a long time to heal, pain or burning while urinating, sores or pain in or around the rectal area |
| Effect on Sleep | Prolonged sleep latency, improved restedness, increased total sleep time, improved sleep continuity, increased REM density, decreased slow-wave sleep, decreased sleep disturbances, reduced insomnia |
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What You'll Learn
- Clozapine is an antipsychotic medicine used to treat schizophrenia and other mental health issues
- It can improve sleep quality and duration, reducing insomnia and enhancing NREM sleep
- Clozapine is not a first-line treatment and has serious side effects, including heart problems
- It can cause drowsiness, sleep disturbances, and nightmares in some patients
- Clozapine may reduce suicide risk in patients with schizophrenia by improving sleep

Clozapine is an antipsychotic medicine used to treat schizophrenia and other mental health issues
Clozapine is an antipsychotic medication used to treat schizophrenia and other mental health issues. It is typically used as a treatment for patients with schizophrenia or schizoaffective disorder who have not responded adequately to other antipsychotic medications or have been unable to tolerate them due to side effects. Clozapine is also used to reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders. It is available only from certified pharmacies under a special program.
Clozapine works by changing the actions of chemicals in the brain, affecting the messages that neurons send by acting on multiple different receptors. It is known to have strong sedative properties and has been found to improve sleep in patients with bipolar and schizoaffective disorders, as well as in those with schizophrenia. Studies have shown that clozapine increases total sleep time, improves sleep continuity, and enhances non-rapid eye movement (NREM) sleep, particularly stage 2 sleep. However, it is important to note that clozapine is not a sleeping pill and should only be taken as directed by a certified medical professional.
While clozapine can be an effective treatment for schizophrenia and certain other mental health issues, it also has several side effects that patients should be aware of. One of the most common side effects is hypersalivation, or excessive saliva production, which can be bothersome during sleep. Other side effects include drowsiness, constipation, tachycardia, low blood pressure, blurred vision, significant weight gain, and dizziness. More seriously, clozapine can cause heart problems such as myocarditis (inflammation of the heart muscle) and an enlarged or hardened heart, which may lead to breathing difficulties and an increased risk of death in older adults with dementia-related psychosis. It can also cause a severe decrease in white blood cells, increasing the risk of serious infections.
Due to these potential side effects, patients taking clozapine should be closely monitored by their doctor and should report any concerning symptoms immediately. It is important to take clozapine exactly as prescribed and not to stop taking it without medical advice. Clozapine may also interact with other medications, so it is crucial to inform your doctor of any other substances you are taking.
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It can improve sleep quality and duration, reducing insomnia and enhancing NREM sleep
Clozapine is an atypical antipsychotic medication used to treat schizophrenia and schizoaffective disorders. It is also used to reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders. It works by altering the actions of chemicals in the brain, and it is only available from a certified pharmacy under a special program.
Clozapine has been found to improve sleep quality and duration in patients with psychiatric disorders. It has been shown to prolong sleep latency, improve restedness, and increase total sleep time. This is particularly relevant for patients with schizophrenia, as insomnia has been found to worsen schizophrenia symptoms and complications from obesity to depression.
Several studies have demonstrated that clozapine reduces insomnia in patients with schizophrenia. One theory suggests that clozapine acts on multiple receptors in the brain, changing the messages that neurons send. It may also influence the melatonin receptor, as variations in this receptor have been associated with insomnia in schizophrenia. Additionally, the strong antihistamine effect of clozapine may contribute to its impact on insomnia.
Furthermore, a longitudinal study found that clozapine significantly improved sleep continuity and increased non-rapid eye movement (NREM) sleep, specifically during stage 2 sleep. This increase in stage 2 NREM sleep is believed to be responsible for clozapine's sleep-consolidating effects. However, it is important to note that clozapine can cause drowsiness and sleep disturbances in some individuals.
While clozapine has been shown to improve sleep in patients with psychiatric disorders, it is not a typical sleeping pill and should only be used under medical supervision for approved indications. It is also important to note that clozapine has serious side effects, including a potentially severe or life-threatening decrease in white blood cell count, which can increase the risk of serious infections. Other adverse effects include hypersalivation, drowsiness, constipation, tachycardia, low blood pressure, blurred vision, significant weight gain, and dizziness.
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Clozapine is not a first-line treatment and has serious side effects, including heart problems
Clozapine is an antipsychotic medicine used to treat schizophrenia in adults after other treatments have failed. It is also used to reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders. It is not a first-line treatment and is only available from a certified pharmacy under a special program.
Clozapine has been found to improve sleep in patients with bipolar and schizoaffective disorders. It prolongs sleep latency, improves restedness, and increases total sleep time. It is primarily a NREM sleep enhancer, increasing stage 2 NREM sleep and REM density.
However, clozapine has serious side effects and requires careful monitoring. It can cause a severe or life-threatening decrease in white blood cell count, increasing the risk of serious or fatal infections. It can also cause seizures, especially at high doses. Clozapine may also lead to drowsiness, blurred vision, and convulsions, which can result in falls, fractures, or other injuries.
One of the most concerning side effects of clozapine is its potential to cause serious heart problems. It can lead to heart inflammation or swelling, enlargement or hardening of the heart, and low blood pressure and slow heart rates. These issues can cause dizziness, lightheadedness, or fainting, especially when initiating treatment or increasing the dose.
Due to these risks, it is crucial to follow the directions provided by a doctor or pharmacist when taking clozapine. It should be taken exactly as directed, and any concerns or side effects should be promptly reported to a medical professional.
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It can cause drowsiness, sleep disturbances, and nightmares in some patients
Clozapine is an antipsychotic medicine used to treat schizophrenia in adults after other treatments have failed. It is also used to reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders. It is not approved for use by anyone younger than 18 years old.
Clozapine is not a sleeping pill, but it can help with sleep. It has been shown to influence sleep in patients with bipolar disorder, schizoaffective disorder, and schizophrenia. It prolongs sleep latency, improves restedness, and increases total sleep time. It is primarily a non-rapid eye movement (NREM) sleep enhancer, increasing stage 2 NREM sleep, and reducing slow-wave sleep.
However, clozapine can cause drowsiness, sleep disturbances, and nightmares in some patients. It has strong sedative properties and can cause blurred vision, convulsions (seizures), or trouble with thinking or controlling body movements, which may lead to falls, fractures, or other injuries. Patients are advised not to drive, operate machinery, swim, or climb while taking clozapine, as they could harm themselves or others if they suddenly lose consciousness.
Additionally, clozapine can cause serious heart problems, including life-threatening heart inflammation or swelling, and an enlarged or hardened heart. It can also cause a severe drop in white blood cells, increasing the risk of serious or fatal infections. Other side effects include extreme tiredness, flu-like symptoms, swollen legs, ankles, or feet, difficulty breathing, chest pain, dizziness, and fast, irregular, or pounding heartbeat.
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Clozapine may reduce suicide risk in patients with schizophrenia by improving sleep
Clozapine is an antipsychotic medication used to treat schizophrenia in adults after other treatments have failed. It is also used to reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders. Approximately 50% of patients with schizophrenia or schizoaffective disorder attempt suicide, and about 10% die by suicide.
Clozapine has been shown to have beneficial effects on sleep. It prolongs sleep latency, improves restedness, and increases total sleep time. It is considered a non-rapid eye movement (NREM) sleep enhancer, particularly during stage 2 sleep. It is not a sleeping pill, but its positive impact on sleep may contribute to its anti-suicidal properties.
Several studies have investigated the effects of clozapine on sleep. One longitudinal study found that clozapine significantly improved sleep continuity and increased REM density in patients who did not experience clozapine-induced fever. Another study evaluated the sleep effects of clozapine in patients with bipolar and schizoaffective disorders, finding that clozapine improved sleep in these individuals.
The exact mechanism by which clozapine reduces suicide risk in patients with schizophrenia is not fully understood. However, the improvement in terminal insomnia has been associated with improved suicidal ideation (SI) after clozapine treatment. This suggests that the beneficial effects of clozapine on sleep may play a role in reducing suicide risk in patients with schizophrenia.
It is important to note that clozapine is not without its side effects. It can cause serious heart problems and increase the risk of seizures, especially at high doses. Clozapine also affects the immune system, making individuals more susceptible to infections, including serious or fatal ones. Therefore, it is crucial to consult with a healthcare professional before taking clozapine or making any changes to medication.
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Frequently asked questions
Clozapine is an antipsychotic medicine used to treat schizophrenia and schizoaffective disorders. It is also used to reduce the risk of suicidal behaviour in adults with schizophrenia or similar disorders.
Clozapine works by changing the actions of chemicals in the brain. It is available only from a certified pharmacy under a special program.
Clozapine has been associated with drowsiness, constipation, hypersalivation (increased saliva production), tachycardia, low blood pressure, blurred vision, significant weight gain, and dizziness. It may also cause serious heart problems, including inflammation of the heart muscle and a severe drop in immune cells.
Yes, clozapine has been found to improve sleep in people with schizophrenia and schizoaffective disorders. It has been shown to prolong sleep latency, improve restedness, increase total sleep time, and enhance NREM sleep.
Clozapine should be taken exactly as prescribed by a doctor. It is not approved for use in older adults with dementia-related psychosis or in anyone younger than 18 years old. Clozapine may also increase the risk of seizures and infections, especially at high doses.





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