Pimozide

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Pimozide
Pimozide.svg
Pimozide-based-on-xtal-3D-bs-17.png
Clinical data
Trade names Orap
AHFS/Drugs.com Monograph
MedlinePlus a686018
License data
Pregnancy
category
  • AU:B1
Routes of
administration
Oral
Drug class Typical antipsychotic
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability 40-50%
Metabolism CYP3A4, CYP1A2 and CYP2D6
Elimination half-life 55 hours (adults), 66 hours (children)
Excretion Urine
Identifiers
  • 1-[1-[4,4-Bis(4-fluorophenyl)butyl]-4-piperidinyl]-1,3-dihydro-2H-benzimidazole-2-one
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard 100.016.520 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C28H29F2N3O
Molar mass 461.557 g·mol−1
3D model (JSmol)
  • Fc1ccc(cc1)C(c2ccc(F)cc2)CCCN5CCC(N4c3ccccc3NC4=O)CC5
  • InChI=1S/C28H29F2N3O/c29-22-11-7-20(8-12-22)25(21-9-13-23(30)14-10-21)4-3-17-32-18-15-24(16-19-32)33-27-6-2-1-5-26(27)31-28(33)34/h1-2,5-14,24-25H,3-4,15-19H2,(H,31,34) Yes check.svgY
  • Key:YVUQSNJEYSNKRX-UHFFFAOYSA-N Yes check.svgY
   (verify)

Pimozide (sold under the brand name Orap) is a neuroleptic drug of the diphenylbutylpiperidine class. It was discovered at Janssen Pharmaceutica in 1963. It has a high potency compared to chlorpromazine (ratio 50-70:1). On a weight basis it is even more potent than haloperidol. It also has special indication for Tourette syndrome and resistant tics.

Contents

Medical uses

Pimozide is used for Tourette syndrome, [2] and resistant tics (Europe, United States, and Canada) and in Europe for schizophrenia, chronic psychosis, delusional disorder, and paranoid personality disorder. [3]

Efficacy

A 2013 systematic review compared pimozide with other antipsychotics for schizophrenia or related psychoses: Pimozide versus any other antipsychotic [4]

In one case a series of 33 patients with delusional parasitosis (median age, 60 years), pimozide was prescribed for 24 patients, 18 of whom took the drug. The dose ranged from 1 to 5 mg daily. No information regarding initial dosing was specified, although the dose was continued for 6 weeks prior to tapering. Of those patients receiving pimozide, 61% (11/18) experienced improvement in or full remission of symptoms. The use of pimozide for the treatment of delusional parasitosis is based primarily on data from case series/reports that demonstrate some efficacy in the majority of patients. Currently, atypical antipsychotics such as olanzapine or risperidone are used as first line treatment. However, patients who experience negative side-effects with the first line medications are typically given pimozide. [5] [6]

Contraindications

It is contraindicated in individuals with either acquired, congenital or a family history of QT interval prolongation. [7] Its use is advised against in individuals with people with either a personal or a family history of arrhythmias or torsades de pointes. [7] Likewise its use is also advised against in individuals with uncorrected hypokalaemia and hypomagnesaemia or clinical significant cardiac disorders (e.g. a recent myocardial infarction or bradycardia. [7] It is also contraindicated in individuals being cotreated with selective serotonin reuptake inhibitors (SSRI) or in those with a known hypersensitivity to pimozide or other diphenylbutyl-piperidine derivatives. [7] Likewise its use is contraindicated in individuals receiving treatment with CYP3A4, CYP1A2, or CYP2D6 inhibitors. [7]

Side effects

Very common (>10% frequency) side effects include: [8] [7] [9] [10]

Overdose

Pimozide overdose presents with severe extrapyramidal symptoms, hypotension, sedation, QT interval prolongation and ventricular arrhythmias including torsades de pointes. [7] Gastric lavage, establishment of a patent airway and, if necessary, mechanically assisted respiration is the recommended treatment for pimozide overdose. [7] Cardiac monitoring should be continued for at least 4 days due to the long half-life of pimozide. [7]

Pharmacology

Pimozide acts as an antagonist of the D2, D3, and D4 receptors and the 5-HT7 receptor. It is also a hERG blocker.

Similarly to other typical antipsychotics pimozide has a high affinity for the dopamine D2 receptor and this likely results in its sexual (due to prolactin hypersecretion) and extrapyramidal side effects as well as its therapeutic efficacy against the positive symptoms of schizophrenia. [11]

Binding profile [Note 1]
ProteinKi (nM) [12] Notes
5-HT1A 650
5-HT2A 48.4This receptor is believed to be responsible for the atypicality of other antipsychotics like clozapine, olanzapine and quetiapine. Pimozide's affinity towards this receptor is low compared to its affinity for the D2 receptor and hence this receptor unlikely contributes to its effects to any meaningful extent.
5-HT2C 2,112
5-HT6 71
5-HT7 0.5Relatively high affinity for this receptor may explain its supposed antidepressant-like effects in animal models of depression. [13]
α1A 197.7Low affinity towards this receptor may explain why pimozide has a lower liability for producing orthostatic hypotension. [11]
α2A 1,593
α2B 821
α2C 376.5
M3 1,955This receptor is believed to be responsible for the interference with glucose homeostasis seen with some of the atypical antipsychotics such as clozapine and olanzapine. [14] Pimozide's low affinity for this receptor likely contributes to the comparatively mild effects on glucose homeostasis.
D1 >10,000
D2 0.33Likely the receptor responsible for the therapeutic effects against the positive symptoms of schizophrenia of antipsychotics like pimozide as well as the prolactin-elevating and extrapyramidal side effect-generating effects of typical antipsychotics like pimozide. [14]
D3 0.25
D4 1.8
hERG 18May be responsible for pimozide's high liability for prolonging the QT interval. [14]
H1 692Likely responsible for why pimozide tends to produce so little sedation. [14]
σ 508
Pharmacokinetic data [8] [7] [9] [10]
Pharmacokinetic parameterValue
Time to peak plasma concentration (Tmax)6-8 hr
Peak plasma concentration (Cmax)4-19 ng/mL
Elimination half-life (t1/2)55 hours (adults), 66 hours (children)
Metabolising enzymes CYP3A4, CYP1A2 and CYP2D6
Excretion pathwaysUrine

History

In 1985 pimozide was approved by the FDA for marketing as an orphan drug for the treatment of Tourette's syndrome. [2]

See also

Notes

  1. A lower Ki value indicates a stronger binding

Related Research Articles

<span class="mw-page-title-main">Antipsychotic</span> Class of medications

Antipsychotics, previously known as neuroleptics and major tranquilizers, are a class of psychotropic medication primarily used to manage psychosis, principally in schizophrenia but also in a range of other psychotic disorders. They are also the mainstay, together with mood stabilizers, in the treatment of bipolar disorder. Moreover, they are also used as adjuncts in the treatment of treatment-resistant major depressive disorder.

<span class="mw-page-title-main">Haloperidol</span> Typical antipsychotic medication

Haloperidol, sold under the brand name Haldol among others, is a typical antipsychotic medication. Haloperidol is used in the treatment of schizophrenia, tics in Tourette syndrome, mania in bipolar disorder, delirium, agitation, acute psychosis, and hallucinations from alcohol withdrawal. It may be used by mouth or injection into a muscle or a vein. Haloperidol typically works within 30 to 60 minutes. A long-acting formulation may be used as an injection every four weeks by people with schizophrenia or related illnesses, who either forget or refuse to take the medication by mouth.

<span class="mw-page-title-main">Typical antipsychotic</span> Class of drugs

Typical antipsychotics are a class of antipsychotic drugs first developed in the 1950s and used to treat psychosis. Typical antipsychotics may also be used for the treatment of acute mania, agitation, and other conditions. The first typical antipsychotics to come into medical use were the phenothiazines, namely chlorpromazine which was discovered serendipitously. Another prominent grouping of antipsychotics are the butyrophenones, an example of which is haloperidol. The newer, second-generation antipsychotics, also known as atypical antipsychotics, have largely supplanted the use of typical antipsychotics as first-line agents due to the higher risk of movement disorders with typical antipsychotics.

<span class="mw-page-title-main">Atypical antipsychotic</span> Class of pharmaceutical drugs

The atypical antipsychotics (AAP), also known as second generation antipsychotics (SGAs) and serotonin–dopamine antagonists (SDAs), are a group of antipsychotic drugs largely introduced after the 1970s and used to treat psychiatric conditions. Some atypical antipsychotics have received regulatory approval for schizophrenia, bipolar disorder, irritability in autism, and as an adjunct in major depressive disorder.

<span class="mw-page-title-main">Risperidone</span> Antipsychotic medication

Risperidone, sold under the brand name Risperdal among others, is an atypical antipsychotic used to treat schizophrenia and bipolar disorder, as well as irritability associated with autism. It is taken either by mouth or by injection. The injectable versions are long-acting and last for 2–4 weeks.

<span class="mw-page-title-main">Quetiapine</span> Atypical antipsychotic medication

Quetiapine, sold under the brand name Seroquel among others, is an atypical antipsychotic medication used for the treatment of schizophrenia, bipolar disorder, and major depressive disorder. Despite being widely used as a sleep aid due to its sedating effect, the benefits of such use may not outweigh its undesirable side effects. It is taken orally.

<span class="mw-page-title-main">Ziprasidone</span> Antipsychotic medication

Ziprasidone, sold under the brand name Geodon among others, is an atypical antipsychotic used to treat schizophrenia and bipolar disorder. It may be used by mouth and by injection into a muscle (IM). The IM form may be used for acute agitation in people with schizophrenia.

<span class="mw-page-title-main">Olanzapine</span> Atypical antipsychotic medication

Olanzapine, sold under the brand name Zyprexa among others, is an atypical antipsychotic primarily used to treat schizophrenia and bipolar disorder. For schizophrenia, it can be used for both new-onset disease and long-term maintenance. It is taken by mouth or by injection into a muscle.

Delusional parasitosis (DP) or delusional infestation is a mental disorder in which individuals have a persistent delusion that they are infested with living or nonliving agents, such as parasites, insects, or bacteria, when no such infestation is present. Individuals may present with dermatologic symptoms, such as excoriation or formication associated with tactile hallucinations, or, in the case of Morgellons disease, a subtype of delusional parasitosis, with wounds from which they believe harmful fibers or parasites are emerging.

<span class="mw-page-title-main">Perphenazine</span> Antipsychotic medication

Perphenazine is a typical antipsychotic drug. Chemically, it is classified as a piperazinyl phenothiazine. Originally marketed in the United States as Trilafon, it has been in clinical use for decades.

<span class="mw-page-title-main">Aripiprazole</span> Atypical antipsychotic

Aripiprazole, sold under the brand names Abilify and Aristada, among others, is an atypical antipsychotic. It is primarily used in the treatment of schizophrenia and bipolar disorder; other uses include as an add-on treatment in major depressive disorder and obsessive–compulsive disorder (OCD), tic disorders, and irritability associated with autism. Aripiprazole is taken by mouth or via injection into a muscle. A Cochrane review found low-quality evidence of effectiveness in treating schizophrenia.

<span class="mw-page-title-main">Sertindole</span> Antipsychotic medication

Sertindole, sold under the brand name Serdolect among others, is an antipsychotic medication. Sertindole was developed by the Danish pharmaceutical company Lundbeck and marketed under license by Abbott Labs. Like other atypical antipsychotics, it has activity at dopamine and serotonin receptors in the brain. It is used in the treatment of schizophrenia. It is classified chemically as a phenylindole derivative.

<span class="mw-page-title-main">Dopamine antagonist</span> Drug which blocks dopamine receptors

A dopamine antagonist, also known as an anti-dopaminergic and a dopamine receptor antagonist (DRA), is a type of drug which blocks dopamine receptors by receptor antagonism. Most antipsychotics are dopamine antagonists, and as such they have found use in treating schizophrenia, bipolar disorder, and stimulant psychosis. Several other dopamine antagonists are antiemetics used in the treatment of nausea and vomiting.

<span class="mw-page-title-main">Amisulpride</span> Atypical antipsychotic and antiemetic medication

Amisulpride is an antiemetic and antipsychotic medication used at lower doses intravenously to prevent and treat postoperative nausea and vomiting; and at higher doses by mouth to treat schizophrenia and acute psychotic episodes. It is sold under the brand names Barhemsys and Solian, Socian, Deniban and others. At very low doses it is also used to treat dysthymia.

<span class="mw-page-title-main">Sulpiride</span> Atypical antipsychotic

Sulpiride, sold under the brand name Dogmatil among others, is an atypical antipsychotic medication of the benzamide class which is used mainly in the treatment of psychosis associated with schizophrenia and major depressive disorder, and is sometimes used in low dosage to treat anxiety and mild depression. Sulpiride is commonly used in Asia, Central America, Europe, South Africa and South America. Levosulpiride is its purified levo-isomer and is sold in India for similar purposes. It is not approved in the United States, Canada, or Australia. The drug is chemically and clinically similar to amisulpride.

<span class="mw-page-title-main">Zotepine</span> Atypical antipsychotic medication

Zotepine is an atypical antipsychotic drug indicated for acute and chronic schizophrenia. It has been used in Germany since 1990 and Japan since 1982.

<span class="mw-page-title-main">Asenapine</span> Medication to treat schizophrenia

Asenapine, sold under the brand name Saphris among others, is an atypical antipsychotic medication used to treat schizophrenia and acute mania associated with bipolar disorder as well as the medium to long-term management of bipolar disorder.

<span class="mw-page-title-main">Lurasidone</span> Atypical antipsychotic medication

Lurasidone, sold under the brand name Latuda among others, is an antipsychotic medication used to treat schizophrenia and bipolar disorder. It is taken by mouth.

<span class="mw-page-title-main">Ecopipam</span> Investigational dopamine antagonist

Ecopipam is a dopamine antagonist which is under development for the treatment of Lesch-Nyhan syndrome, Tourette syndrome, speech disorders, and restless legs syndrome. It is taken by mouth.

<span class="mw-page-title-main">Cariprazine</span> Atypical antipsychotic medicine

Cariprazine, sold under the brand name Vraylar among others, is an atypical antipsychotic developed by Gedeon Richter, which is used in the treatment of schizophrenia, bipolar mania, bipolar depression, and major depressive disorder. It acts primarily as a D3 and D2 receptor partial agonist, with a preference for the D3 receptor. Cariprazine is also a partial agonist at the serotonin 5-HT1A receptor and acts as an antagonist at 5-HT2B and 5-HT2A receptors, with high selectivity for the D3 receptor. It is taken by mouth.

References

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  3. Munro A (1999). Delusional disorder. Cambridge: Cambridge University Press. ISBN   0-521-58180-X.
  4. Mothi M, Sampson S (November 2013). "Pimozide for schizophrenia or related psychoses". The Cochrane Database of Systematic Reviews. 11 (11): CD001949. doi:10.1002/14651858.CD001949.pub3. PMID   24194433. Archived from the original on 27 November 2017.
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  6. Meehan WJ, Badreshia S, Mackley CL (March 2006). "Successful treatment of delusions of parasitosis with olanzapine". Archives of Dermatology. 142 (3): 352–355. doi:10.1001/archderm.142.3.352. PMID   16549712.
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  12. Roth BL, Driscol J (12 January 2011). "PDSP Ki Database". Psychoactive Drug Screening Program (PDSP). University of North Carolina at Chapel Hill and the United States National Institute of Mental Health. Archived from the original on 8 November 2013. Retrieved 4 December 2013.
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