Prochlorperazine

Prochlorperazine is used to prevent vomiting caused by chemotherapy, radiation therapy and in the pre- and postoperative setting.{{cite journal | vauthors = Lau Moon Lin M, Robinson PD, Flank J, Sung L, Dupuis LL | title = The Safety of Prochlorperazine in Children: A Systematic Review and Meta-Analysis | journal = Drug Safety | volume = 39 | issue = 6 | pages = 509–516 | date = June 2016 | pmid = 26884326 | doi = 10.1007/s40264-016-0398-9 | s2cid = 39349233 }} A 2015 Cochrane review found no differences in efficacy among drugs commonly used for this purpose in emergency rooms.{{cite journal | vauthors = Furyk JS, Meek RA, Egerton-Warburton D | title = Drugs for the treatment of nausea and vomiting in adults in the emergency department setting | journal = The Cochrane Database of Systematic Reviews | issue = 9 | pages = CD010106 | date = September 2015 | volume = 2018 | pmid = 26411330 | pmc = 6517141 | doi = 10.1002/14651858.CD010106.pub2 }}

Prochlorperazine, generally by intravenous, is used to treat migraine.{{cite journal | vauthors = Golikhatir I, Cheraghmakani H, Bozorgi F, Jahanian F, Sazgar M, Montazer SH | title = The Efficacy and Safety of Prochlorperazine in Patients With Acute Migraine: A Systematic Review and Meta-Analysis | journal = Headache | volume = 59 | issue = 5 | pages = 682–700 | date = May 2019 | pmid = 30990883 | doi = 10.1111/head.13527 | s2cid = 119544256 }}{{cite journal | vauthors = Patniyot IR, Gelfand AA | title = Acute Treatment Therapies for Pediatric Migraine: A Qualitative Systematic Review | journal = Headache | volume = 56 | issue = 1 | pages = 49–70 | date = January 2016 | pmid = 26790849 | doi = 10.1111/head.12746 | s2cid = 25893066 }} Such use is recommended by The American Headache Society. A 2019 systematic review found prochlorperazine was nearly three times more likely than metoclopramide to relieve headache within 60 minutes of administration.

In the UK prochlorperazine maleate has been used for labyrinthitis, which includes nausea and vertigo.{{cite journal | vauthors = Coatesworth AP | title = Assessment and treatment of dizziness | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 69 | issue = 5 | pages = 706–707 | date = November 2000 | pmid = 11184241 | pmc = 1763384 | doi = 10.1136/jnnp.69.5.706 }}

Sedation is very common, and extrapyramidal side effects are common and include restlessness, dystonic reactions, pseudoparkinsonism, and akathisia; the extrapyramidal symptoms can affect 2% of people at low doses, whereas higher doses may affect as many as 40% of people.{{cite book | vauthors = Brown TM, Stoudemire A | title = Psychiatric Side Effects of Prescription and Over-The-Counter Medications | chapter = Antipsychotics | publisher = American Psychiatric Publishing | year = 1998 | pages = 1946 | chapter-url = https://books.google.com/books?id=K7kevbILCuQC&pg=PA1946| isbn = 9780880488686 }}{{cite web|url=https://www.drugs.com/sfx/procot-side-effects.html|title=Procot Side Effects in Detail|website=Drugs.com}}

Prochlorperazine can also cause a life-threatening condition called neuroleptic malignant syndrome (NMS). Some symptoms of NMS include high fever, stiff muscles, neck muscle spasms, confusion, irregular pulse or blood pressure, fast heart rate (tachycardia), sweating, and abnormal heart rhythms (arrhythmias). Research from the Veterans Administration and the United States Food and Drug Administration show injection site reactions. Adverse effects are similar in children.

The FDA-approved label for prochlorperazine includes a warning for increased risk of mortality in elderly patients with dementia-related psychosis.{{Cite web|title=Prochlorperazine Maleate Tablets, USP|url=https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=2fd7803f-fb1f-4f00-86ad-c2436b569e6d&type=display#:~:text=WARNINGS-,Increased%20Mortality%20in%20Elderly%20Patients%20with%20Dementia-Related%20Psychosis,psychosis%20(see%20BOXED%20WARNING).|access-date=2022-02-02|website=dailymed.nlm.nih.gov}}

The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.{{cite book |editor1-first=BMJ | editor = Joint Formulary Committee | title = British National Formulary | edition = 57 | date = March 2009 |publisher=Royal Pharmaceutical Society of Great Britain |location=United Kingdom |isbn=978-0-85369-845-6 |page=192 |chapter=4.2.1 |quote=Withdrawal of antipsychotic drugs after long-term therapy should always be gradual and closely monitored to avoid the risk of acute withdrawal syndromes or rapid relapse.}} Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.{{cite book | vauthors = Haddad P, Haddad PM, Dursun S, Deakin B |title=Adverse Syndromes and Psychiatric Drugs: A Clinical Guide |date=2004 |publisher=OUP Oxford |isbn=9780198527480 |pages=207–216 |url=https://books.google.com/books?id=CWR7DwAAQBAJ&pg=PA207 }} Other symptoms may include restlessness, increased sweating, and trouble sleeping. Less commonly there may be a feeling of the world spinning, numbness, or muscle pains. Symptoms generally resolve after a short period of time.

There is tentative evidence that discontinuation of antipsychotics can result in psychosis.{{cite journal | vauthors = Moncrieff J | title = Does antipsychotic withdrawal provoke psychosis? Review of the literature on rapid onset psychosis (supersensitivity psychosis) and withdrawal-related relapse | journal = Acta Psychiatrica Scandinavica | volume = 114 | issue = 1 | pages = 3–13 | date = July 2006 | pmid = 16774655 | doi = 10.1111/j.1600-0447.2006.00787.x | s2cid = 6267180 }} It may also result in reoccurrence of the condition that is being treated.{{cite book | vauthors = Sacchetti E, Vita A, Siracusano A, Fleischhacker W |title=Adherence to Antipsychotics in Sc |date=2013 |publisher=Springer Science & Business Media |isbn=9788847026797 |page=85 |url=https://books.google.com/books?id=odE-AgAAQBAJ&pg=PA85 }} Rarely tardive dyskinesia can occur when the medication is stopped.

Prochlorperazine is thought to exert its antipsychotic effects by blocking dopamine receptors.{{cite book | vauthors = Ebadi MS | title = Desk Reference of Clinical Pharmacology | date = 2007 }}

Prochlorperazine is analogous to chlorpromazine; both of these agents antagonize dopaminergic D₂ receptors in various pathways of the central nervous system. This D₂ blockade results in antipsychotic, antiemetic and other effects. Hyperprolactinemia is a side effect of dopamine antagonists as blockade of D₂ receptors within the tuberoinfundibular pathway results in increased plasma levels of prolactin due to increased secretion by lactotrophs in the anterior pituitary.

Following intramuscular injection, the antiemetic action is evident within 5 to 10 minutes and lasts for three to four hours. Rapid action is also noted after buccal treatment. With oral dosing, the start of action is delayed but the duration is somewhat longer (approximately six hours).

In the United Kingdom, prochlorperazine is available for the treatment of nausea caused by migraine as a tablet dissolved in the mouth, and in Australia as a tablet swallowed whole. In the UK, it is available via a prescription and as a pharmacy medicine, meaning it does not require a prescription but is only available after talking with a pharmacist.{{cite web|title=Buccastem M - Summary of Product Characteristics (SPC) - (eMC)|url=https://www.medicines.org.uk/emc/medicine/22797|publisher=UK Electronic Medicines Compendium|access-date=19 September 2017|date=16 February 2016}}{{cite web|title=Medicines information|url=http://www.nhs.uk/conditions/Medicinesinfo/Pages/Introduction.aspx|publisher=NHS Choices|access-date=19 September 2017|archive-date=22 October 2017|archive-url=https://web.archive.org/web/20171022015130/https://www.nhs.uk/conditions/medicinesinfo/pages/introduction.aspx|url-status=dead}}

Prochlorperazine is available as tablets, suppositories, and in an injectable form.

As of September 2017 it was marketed under the trade names Ametil, Antinaus, Buccastem, Bukatel, Chlormeprazine, Chloropernazine, Compazine, Compro, Daolin, Dhaperazine, Emedrotec, Emetiral, Eminorm, Lotamin, Mitil, Mormal, Nautisol, Novamin, Novomit, Proazine, Procalm, Prochlorperazin, Prochlorperazine, Prochlorpérazine, Prochlorperazinum, Prochlozine, Proclorperazina, Promat, Promin, Promtil, Roumin, Scripto-metic, Seratil, Stemetil, Steremal, Vergon, Vestil, and Volimin.{{cite web|title=Prochlorperazine international brands|url=https://www.drugs.com/international/prochlorperazine.html|publisher=Drugs.com|access-date=19 September 2017}}{{cite web|url=https://www.rxlist.com/compazine-drug/patient-images-side-effects.htm|title=Compazine (Prochlorperazine) Patient Information: Side Effects and Drug Images at RxList|website=RxList}}

Prochlorperazine was combined with paracetamol and marketed{{When?|date=April 2025}} for humans as the combination drug Vestil-A; it was combined with isopropamide (brand name Darbazine) as a combination drug for veterinary use.

Until 1981, a combination diet pill composed of prochlorperazine and dextroamphetamine was marketed as Eskatrol in the United States by Smith, Kline & French Laboratories.

Alexza Pharmaceuticals studied an inhaled form of prochlorperazine for the treatment of migraine through Phase II trials under the development name AT-001; development was discontinued in 2011.{{cite journal | vauthors = Chua AL, Silberstein S | title = Inhaled drug therapy development for the treatment of migraine | journal = Expert Opinion on Pharmacotherapy | volume = 17 | issue = 13 | pages = 1733–1743 | date = September 2016 | pmid = 27416108 | doi = 10.1080/14656566.2016.1203901 | s2cid = 11724776 }}

File:Prochlorperazine synthesis.svg

The alkylation of 2-chlorophenothiazine (1) and 1-(3-Chloropropyl)-4-methylpiperazine [104-16-5] (2) in the presence of sodamide gives Prochlorperazine (3); or by alkylation of 2-Chloro-10-(3-chloropropyl)phenothiazine [2765-59-5] (4) and 1-methylpiperazine (5).

{{Reflist}}

• {{cite web | url = https://druginfo.nlm.nih.gov/drugportal/name/prochlorperazine | publisher = U.S. National Library of Medicine | work = Drug Information Portal | title = Prochlorperazine }}

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