Not to be confused with clonazepam.
Skeletal formula of clozapine
Stick-and-ball model of the clozapine molecule
Clinical data
Trade names Clozaril, FazaClo, Versacloz
AHFS/ Monograph
MedlinePlus a691001
  • AU: C
  • US: B (No risk in non-human studies) [1]
Routes of
ATC code N05AH02 (WHO)
Legal status
Legal status
Pharmacokinetic data
Bioavailability 60 to 70%
Metabolism Liver, by several CYP isozymes
Biological half-life 6 to 26 hours (mean value 14.2 hours in steady state conditions)
Excretion 80% in metabolized state: 30% biliary and 50% kidney
CAS Number 5786-21-0 YesY
PubChem (CID) 2818
DrugBank DB00363 YesY
ChemSpider 10442628 YesY
KEGG D00283 YesY
ECHA InfoCard 100.024.831
Chemical and physical data
Formula C18H19ClN4
Molar mass 326.823 g/mol
3D model (Jmol) Interactive image
Melting point 183 °C (361 °F)
Solubility in water 0.1889[2] mg/mL (20 °C)

Clozapine, sold under the brand name Clozaril among others, is an atypical antipsychotic medication.[1] It is mainly used for schizophrenia that does not improve following the use of other antipsychotic medications. In those with schizophrenia and schizoaffective disorder it may decrease the rate of suicidal behavior.[1] It is possibly more effective than typical antipsychotics and in those who are treatment resistant.[3][4] It is taken by mouth.[1]

Clozapine is associated with a relatively high risk of low white blood cells which may result in death. To decrease this risk it is recommended that the blood be regularly monitored.[1] Other serious risks include seizures, inflammation of the heart, high blood sugar levels, and in older people with psychosis as a result of dementia an increased risk of death.[1][5] Common side effects include drowsiness, dry mouth, low blood pressure, trouble seeing, and dizziness.[1] The potentially permanent movement disorder tardive dyskinesia occurs in about 5% of people.[5] Its mechanism of action is not entirely clear.[1]

Clozapine was first made in 1958 and sold commercially in 1972.[6] It was the first atypical antipsychotic.[7] It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system.[8] It is available as a generic medication.[1] The wholesale cost in the developing world is between 0.05 and 2.10 USD per day as of 2014.[9]

Medical uses

Clozapine is an atypical antipsychotic drug primarily used in people who are unresponsive to or intolerant of other antipsychotics.[10] This means that they have failed to respond satisfactorily to at least two different antipsychotics.[11] It has been shown to be more effective in reducing symptoms of schizophrenia than typical antipsychotics, with more pronounced effects in those who have responded poorly to other medication. The relapse rate is lower and patient acceptability is better.[10] There is some evidence clozapine may reduce propensity for substance abuse in schizophrenic patients.[12]

It may be better than other antipsychotics in people with both schizophrenia and Parkinson's.[13]

Clozapine is not recommended for the treatment of behavior problems in older adults with dementia.

Side effects

Clozapine may cause side effects. Some are serious and potentially fatal. Common side effects include constipation, bed-wetting, night-time drooling, muscle stiffness, sedation, tremors, orthostatic hypotension, hyperglycemia, and weight gain. The risk of developing extrapyramidal symptoms such as tardive dyskinesia is below that of typical antipsychotics; this may be due to clozapine's anticholinergic effects. Extrapyramidal symptoms may subside somewhat after a person switches from another antipsychotic to clozapine.[14]

Clozapine also carries five black box warnings, including warnings for agranulocytosis, CNS depression, leukopenia, neutropenia, seizure disorder, bone marrow suppression, dementia, hypotension, myocarditis, orthostatic hypotension (with or without syncope) and seizures.[15] Lowering of the seizure threshold may be dose related and slow initial titration of dose may decrease the risk for precipitating seizures. Slow titration of dosing may also decrease the risk for orthostatic hypotension and other adverse cardiovascular side effects.[16]

Many male patients have experienced cessation of ejaculation during orgasm as a side effect of clozapine, though this is not documented in official drug guides.[17]

However, many side-effects can be managed and do not necessarily warrant discontinuation.[18]


Main article: Agranulocytosis

Clozapine carries a black box warning for drug-induced agranulocytosis. Without monitoring, agranulocytosis occurs in about 1% of patients who take clozapine during the first few months of treatment;[19] the risk of developing it is highest about three months into treatment, and decreases substantially thereafter, to less than 0.01% after one year.[20]

Clozapine-induced agranulocytosis can be transient.[21]

Cardiac toxicity

Myocarditis is a sometimes fatal side effect of clozapine, which usually develops within the first month of commencement.[22] First manifestations of illness are fever which may be accompanied by symptoms associated with upper respiratory tract, gastrointestinal or urinary tract infection. Typically C-reactive protein (CRP) increases with the onset of fever and rises in the cardiac enzyme, troponin, occur up to 5 days later. Monitoring guidelines advise checking CRP and troponin at baseline and weekly for the first 4 weeks after clozapine initiation and observing the patient for signs and symptoms of illness.[23] Signs of cardiac failure are less common and may develop with the rise in troponin. A recent case-control study found that the risk of clozapine-induced myocarditis is increased with increasing rate of clozapine dose titration, increasing age and concomitant sodium valproate.[24]

Gastrointestinal hypomotility

Another underrecognized and potentially life-threatening side effect spectrum is gastrointestinal hypomotility, which may manifest as severe constipation, fecal impaction, paralytic ileus, bowel obstruction, acute megacolon, ischemia or necrosis. Colonic hypomotility has been shown to occur in up to 80% of people prescribed clozapine when gastrointestinal function is measured objectively using radiopaque markers.[25] Monitoring of bowel function is recommended, as untreated cases are occasionally fatal.[26][27]


While clozapine is a muscarinic antagonist at the M1, M2, M3, and M5 receptors, clozapine is a full agonist at the M4 subset. Because M4 is highly expressed in the salivary gland, its M4 agonist activity is thought to be responsible for the hypersalivation.[28]

Central nervous system

CNS side effects include drowsiness, vertigo, headache, tremor, syncope, sleep disturbances, nightmares, restlessness, akinesia, agitation, seizures, rigidity, akathisia, confusion, fatigue, insomnia, hyperkinesia, weakness, lethargy, ataxia, slurred speech, depression, myoclonic jerks, and anxiety. Rarely seen are delusions, hallucinations, delirium, amnesia, libido increase or decrease, paranoia and irritability, abnormal EEG, worsening of psychosis, paresthesia, status epilepticus, and obsessive compulsive symptoms. Similar to other antipsychotics clozapine rarely has been known to cause neuroleptic malignant syndrome.[29]

Urinary incontinence

Clozapine is linked to urinary incontinence[30] though its appearance may be under-recognized.[31]

Withdrawal effects

Abrupt withdrawal may lead to cholinergic rebound effects, severe movement disorders as well as severe psychotic decompensation. It has been recommended that patients, families, and caregivers are aware of the symptoms and risks of abrupt withdrawal of clozapine. When discontinuing clozapine, gradual dose reduction is recommended to reduce the intensity of withdrawal effects.[32][33]

Weight gain and diabetes

In addition to hyperglycemia, significant weight gain is frequently experienced by patients treated with clozapine.[34] Impaired glucose metabolism and obesity have been shown to be constituents of the metabolic syndrome and may increase the risk of cardiovascular disease. The data suggest that clozapine may be more likely to cause adverse metabolic effects than some of the other atypical antipsychotics.[35] A study has established that olanzapine and clozapine disturb the metabolism by making the body take preferentially its energy from fat (instead of privileging carbohydrates). Levels of carbohydrates remaining high, the body develops insulin resistance (causing diabetes).[36]


Fluvoxamine inhibits the metabolism of clozapine leading to significantly increased blood levels of clozapine.[37]

When carbamazepine is concurrently used with clozapine, it has been shown to decrease plasma levels of clozapine significantly thereby decreasing the beneficial effects of clozapine.[38][39] Patients should be monitored for “decreased therapeutic effects of clozapine if carbamazepine” is started or increased. If carbamazepine is discontinued or the dose of carbamazepine is decreased, therapeutic effects of clozapine should be monitored. The study recommends carbamazepine to not be used concurrently with clozapine due to increased risk of agranulocytosis.[40]

Published case reports have stated that the use of benzodiazepines and clozapine concomitantly can result in severe adverse reaction such as respiratory arrest, cardiac arrest and sudden death.[41]

Ciprofloxacin is an inhibitor of CYP1A2 and clozapine is a major CYP1A2 substrate. Randomized study reported elevation in clozapine concentration in schizophrenia subjects concurrently taking ciprofloxacin.[42] Thus, the prescribing information for clozapine recommends “reducing the dose of clozapine by one-third of original dose” when ciprofloxacin and other CYP1A2 inhibitors are added to therapy, but once ciprofloxacin is removed from therapy, it is recommended to return clozapine to original dose.[43]


Clozapine is a dibenzodiazepine that is structurally related to loxapine. It is slightly soluble in water, soluble in acetone, and highly soluble in chloroform. Its solubility in water is 188.9 mg/L (25 °C).[2] Its manufacturer, Novartis, claims a solubility of <0.01% in water (<100 mg/L).[44]

Mechanism of action

Clozapine is classified as an atypical antipsychotic drug because it binds to serotonin as well as dopamine receptors.[45]

Clozapine is a partial agonist[46] at the 5-HT1A subunit of the serotonin receptor, putatively improving depression, anxiety, and the negative cognitive symptoms associated with schizophrenia.[47]

A direct interaction of clozapine with the GABAB receptor has also been shown.[48] GABAB receptor-deficient mice exhibit increased extracellular dopamine levels and altered locomotor behaviour equivalent to that in schizophrenia animal models.[49] GABAB receptor agonists and positive allosteric modulators reduce the locomotor changes in these models.[50]

Clozapine induces the release of glutamate and D-serine, an agonist at the glycine site of the NMDA receptor, from astrocytes,[51] and reduces the expression of astrocytic glutamate transporters. These are direct effects that are also present in astrocyte cell cultures not containing neurons. Clozapine prevents impaired NMDA receptor expression caused by NMDA receptor antagonists.[52]

Binding Affinity (Ki [nM]) towards cloned human receptors unless otherwise specified[53]

Receptor/Transporter Protein Clozapine Norclozapine
SERT 1624 316.6
NET 3168 493.9
DAT >10,000 >10,000
5-HT1A 123.7 13.9
5-HT1B 519 406.8
5-HT1D 1356 476.2
5-HT2A 5.35 10.9
5-HT2B 8.37 2.8
5-HT2C 9.44 11.9
5-HT3 241 272.2
5-HT5A 3857 350.6
5-HT6 13.49 11.6
5-HT7 17.95 60.1
D1 266.25 14.3
D2 157 101.4
D3 269.08 193.5
D4 26.36 63.94
D5 255.33 283.6
α1A 1.62 104.8
α1B 7 85.2
α2A 37 137.6
α2B 26.5 95.1
α2C 6 117.7
β1 5000 6239
β2 1650 4725
M1 6.17 67.6
M2 36.67 414.5
M3 19.25 95.7
M4 15.33 169.9
M5 15.5 35.4
H1 1.13 3.4
H2 153 345.1
H3 >10,000 >10,000
H4 665 1028
δ-opioid 1000 (Mouse receptor) 127.9
μ-opioid 1000 (Rat receptor) >10,000
κ-opioid 1000 (Guinea pig receptor) >10,000
σ1 5000 (Guinea pig receptor) >10,000
σ2 - >10,000


N-desmethylclozapine (norclozapine), clozapine's chief active metabolite

The absorption of clozapine is almost complete, but the oral bioavailability is only 60 to 70% due to first-pass metabolism. The time to peak concentration after oral dosing is about 2.5 hours, and food does not appear to affect the bioavailability of clozapine. The elimination half-life of clozapine is about 14 hours at steady state conditions (varying with daily dose).

Clozapine is extensively metabolized in the liver, via the cytochrome P450 system, to polar metabolites suitable for elimination in the urine and feces. The major metabolite, norclozapine (desmethyl-clozapine), is pharmacologically active. The cytochrome P450 isoenzyme 1A2 is primarily responsible for clozapine metabolism, but 2C, 2D6, 2E1 and 3A3/4 appear to play roles as well. Agents that induce (e.g., cigarette smoke) or inhibit (e.g., theophylline, ciprofloxacin, fluvoxamine) CYP1A2 may increase or decrease, respectively, the metabolism of clozapine. For example, the induction of metabolism caused by smoking means that smokers require up to double the dose of clozapine compared with non-smokers to achieve an equivalent plasma concentration.[54]

Clozapine and norclozapine plasma levels may also be monitored, though they show a significant degree of variation and are higher in women and increase with age.[55] Monitoring of plasma levels of clozapine and norclozapine has been shown to be useful in assessment of compliance, metabolic status, prevention of toxicity, and in dose optimization.[54]


Clozapine was synthesized in 1958 by Wander AG, a Swiss pharmaceutical company, based on the chemical structure of the tricyclic antidepressant imipramine. The first test in humans in 1962 was considered a failure. Trials in Germany in 1965 and 1966 as well as a trial in Vienna in 1966 were successful. In 1967 Wander AG was acquired by Sandoz.[6] Further trials took place in 1972 when clozapine was released in Switzerland and Austria as Leponex. Two years later it was released in West Germany, and Finland in 1975. Early testing was performed in the United States around the same time.[56] In 1975, after reports of agranulocytosis leading to death in some clozapine-treated patients, clozapine was voluntarily withdrawn by the manufacturer.[57] Clozapine fell out of favor for more than a decade despite unclear reasons for the agranulocytosis which occurred in Finland, the rate of which was 20 times higher[58] than had been reported in any other country. However, when studies demonstrated that clozapine was more effective against treatment-resistant schizophrenia than other antipsychotics, the FDA and health authorities in most other countries approved its use only for treatment-resistant schizophrenia, and required Restricted Distribution, a Patient Registry and regular hematological monitoring to detect granulocytopenia, before agranulocytosis develops. In December 2002, clozapine was approved in the US for reducing the risk of suicide in schizophrenic or schizoaffective patients judged to be at chronic risk for suicidal behavior.[59] In 2005 FDA approved criteria to allow reduced blood monitoring frequency.[60] In 2015 the individual manufacturer Patient Registries were consolidated by FDA request into a single shared Patient Registry Called The Clozapine REMS Registry.

See also


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Further reading

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