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Fluphenazine, sold under the brand name Prolixin among others, is a high-potency typical antipsychotic medication.^[2] It is used in the treatment of chronic psychoses such as schizophrenia,^[2]^[3] and appears to be about equal in effectiveness to low-potency antipsychotics like chlorpromazine.^[4] It is given by mouth, injection into a muscle, or just under the skin.^[2] There is also a long acting injectable version that may last for up to four weeks.^[2] Fluphenazine decanoate, the depot injection form of fluphenazine, should not be used by people with severe depression.^[5]

Common side effects include movement problems, sleepiness, depression and increased weight.^[2] Serious side effects may include neuroleptic malignant syndrome, low white blood cell levels, and the potentially permanent movement disorder tardive dyskinesia.^[2] In older people with psychosis as a result of dementia it may increase the risk of dying.^[2] It may also increase prolactin levels which may result in milk production, enlarged breasts in males, impotence, and the absence of menstrual periods.^[2] It is unclear if it is safe for use in pregnancy.^[2]

Fluphenazine is a typical antipsychotic of the phenothiazine class.^[2] Its mechanism of action is not entirely clear but believed to be related to its ability to block dopamine receptors.^[2] In up to 40% of those on long term phenothiazines, liver function tests become mildly abnormal.^[6]

Fluphenazine came into use in 1959.^[7] The injectable form is on the World Health Organization's List of Essential Medicines.^[8] It is available as a generic medication.^[2] It was discontinued in Australia in 2017.^[9]

A 2018 Cochrane review found that fluphenazine was an imperfect treatment and other inexpensive drugs less associated with side effects may be an equally effective choice for people with schizophrenia.^[10] Another 2018 Cochrane review found that there was limited evidence that newer atypical antipsychotics were more tolerable than fluphenazine.^[11] Intramuscular depot injection forms are available as both the decanoate and enanthate esters.^[12]

The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.^[13] Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.^[14] Other symptoms may include restlessness, increased sweating, and trouble sleeping.^[14] Less commonly there may be a feeling of the world spinning, numbness, or muscle pains.^[14] Symptoms generally resolve after a short period of time.^[14]

There is tentative evidence that discontinuation of antipsychotics can result in psychosis.^[15] It may also result in reoccurrence of the condition that is being treated.^[16] Rarely tardive dyskinesia can occur when the medication is stopped.^[14]

Fluphenazine acts primarily by blocking post-synaptic dopaminergic D₂ receptors in the basal ganglia, cortical and limbic system. It also blocks α₁ adrenergic receptors, muscarinic M₁ receptors, and histaminergic H₁ receptors.^[17]^[18]

Fluphenazine^[19] Site K_i (nM) Action Ref 5-HT_1A 145–2829 ND ^[19] 5-HT_1B 334 ND ^[19] 5-HT_1D 334 ND ^[19] 5-HT_1E 540 ND ^[19] 5-HT_2A 3.8–98 ND ^[19] 5-HT_2B ND ND ^[19] 5-HT_2C 174–2,570 ND ^[19] 5-HT₃ 4,265– >10,000 ND ^[19] 5-HT_5A 145 ND ^[19] 5-HT₆ 7.9–38 ND ^[19] 5-HT₇ 8 ND ^[19] D₁ 14.45 ND ^[19] D₂ 0.89 ND D_2L ND ^[19] D₃ 1.412 ND ^[19] D₄ 89.12 ND ^[19] D₅ 95–2,590 ND ^[19] α_1A 6.4–9 ND ^[19] α_1B 13 ND ^[19] α_2A 304–314 ND ^[19] α_2B 181.6–320 ND ^[19] α_2C 28.8–122 ND ^[19] β₁ >10,000 ND ^[19] β₂ >10,000 ND ^[19] H₁ 7.3–70 ND ^[19] H₂ 560 ND ^[19] H₃ 1,000 ND ^[19] H₄ >10,000 ND ^[19] M₁ 1,095-3,235.93 ND ^[19] M₂ 2,187.76–7,163 ND ^[19] M₃ 1441–1445.4 ND ^[19] M₄ 5,321 ND ^[19] M₅ 357 ND ^[19] SERTTooltip Serotonin transporter ND ND ^[19] NETTooltip Norepinephrine transporter ND ND ^[19] DATTooltip Dopamine transporter ND ND ^[19] NMDA
(PCP) ND ND ^[19] Values are K_i (nM). The smaller the value, the more strongly the drug binds to the site. All data are for human cloned proteins, except 5-HT₃ (rat), D₄ (human/rat), H₃ (guinea pig), and NMDA/PCP (rat).^[19]

Fluphenazine came into use in 1959.^[7]

The injectable form is on the World Health Organization's List of Essential Medicines.^[8] It is available as a generic medication.^[2] It was discontinued in Australia in 2017.^[9]

In horses, it is sometimes given by injection as an anxiety-relieving medication, though there are many negative common side effects and it is forbidden by many equestrian competition organizations.^[30]

^ Anvisa (31 March 2023). "RDC Nº 784 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial" [Collegiate Board Resolution No. 784 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control] (in Brazilian Portuguese). Diário Oficial da União (published 4 April 2023). Archived from the original on 3 August 2023. Retrieved 16 August 2023.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o "fluphenazine decanoate". The American Society of Health-System Pharmacists. Archived from the original on 8 December 2015. Retrieved 1 December 2015.
^ "Product Information: Modecate (Fluphenazine Decanoate Oily Injection )" (PDF). TGA eBusiness Services. Bristol-Myers Squibb Australia Pty Ltd. 1 November 2012. Archived from the original on 2 August 2017. Retrieved 9 December 2013.
^ Tardy M, Huhn M, Engel RR, Leucht S (August 2014). "Fluphenazine versus low-potency first-generation antipsychotic drugs for schizophrenia". The Cochrane Database of Systematic Reviews. 2014 (8): CD009230. doi:10.1002/14651858.CD009230.pub2. PMC 10898219. PMID 25087165.
^ "Modecate Injection 25mg/ml - Patient Information Leaflet (PIL) - (eMC)". www.medicines.org.uk. Archived from the original on 7 November 2017. Retrieved 6 November 2017.
^ "Fluphenazine". livertox.nih.gov. 2012. PMID 31643176. Retrieved 6 November 2017.
^ ^a ^b McPherson EM (2007). Pharmaceutical Manufacturing Encyclopedia (3rd ed.). Burlington: Elsevier. p. 1680. ISBN 9780815518563.
^ ^a ^b World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
^ ^a ^b Rossi S, ed. (July 2017). "Fluphenazine - Australian Medicines Handbook". Australian Medicines Handbook. Adelaide, Australia: Australian Medicines Handbook Pty Ltd. Retrieved 8 August 2017.
^ Matar HE, Almerie MQ, Sampson SJ (June 2018). "Fluphenazine (oral) versus placebo for schizophrenia". The Cochrane Database of Systematic Reviews. 6 (6): CD006352. doi:10.1002/14651858.CD006352.pub3. PMC 6513420. PMID 29893410.
^ Sampford JR, Sampson S, Li BG, Zhao S, Xia J, Furtado VA (July 2016). "Fluphenazine (oral) versus atypical antipsychotics for schizophrenia". The Cochrane Database of Systematic Reviews. 7 (7): CD010832. doi:10.1002/14651858.CD010832.pub2. PMC 6474115. PMID 27370402.
^ Maayan N, Quraishi SN, David A, Jayaswal A, Eisenbruch M, Rathbone J, et al. (February 2015). "Fluphenazine decanoate (depot) and enanthate for schizophrenia". The Cochrane Database of Systematic Reviews. 2015 (2): CD000307. doi:10.1002/14651858.CD000307.pub2. PMC 10388394. PMID 25654768.
^ Joint Formulary Committee B, ed. (March 2009). "4.2.1". British National Formulary (57 ed.). United Kingdom: Royal Pharmaceutical Society of Great Britain. p. 192. ISBN 978-0-85369-845-6. 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.
^ ^a ^b ^c ^d ^e Haddad P, Haddad PM, Dursun S, Deakin B (2004). Adverse Syndromes and Psychiatric Drugs: A Clinical Guide. OUP Oxford. pp. 207–216. ISBN 9780198527480.
^ Moncrieff J (July 2006). "Does antipsychotic withdrawal provoke psychosis? Review of the literature on rapid onset psychosis (supersensitivity psychosis) and withdrawal-related relapse". Acta Psychiatrica Scandinavica. 114 (1): 3–13. doi:10.1111/j.1600-0447.2006.00787.x. PMID 16774655. S2CID 6267180.
^ Sacchetti E, Vita A, Siracusano A, Fleischhacker W (2013). Adherence to Antipsychotics in Schizophrenia. Springer Science & Business Media. p. 85. ISBN 9788847026797.
^ Siragusa S, Saadabadi A (2020). "Fluphenazine". StatPearls. PMID 29083807.
^ "Fluphenazine". PubChem. U.S. National Library of Medicine. Retrieved 30 September 2019.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae ^af ^ag ^ah ^ai ^aj ^ak ^al Roth BL, Driscol J. "PDSP K_i Database". Psychoactive Drug Screening Program (PDSP). University of North Carolina at Chapel Hill and the United States National Institute of Mental Health. Retrieved 14 August 2017.
^ Parent M, Toussaint C, Gilson H (1983). "Long-term treatment of chronic psychotics with bromperidol decanoate: clinical and pharmacokinetic evaluation". Current Therapeutic Research. 34 (1): 1–6.
^ ^a ^b Jørgensen A, Overø KF (1980). "Clopenthixol and flupenthixol depot preparations in outpatient schizophrenics. III. Serum levels". Acta Psychiatrica Scandinavica. Supplementum. 279: 41–54. doi:10.1111/j.1600-0447.1980.tb07082.x. PMID 6931472.
^ ^a ^b Reynolds JE (1993). "Anxiolytic sedatives, hypnotics and neuroleptics.". Martindale: The Extra Pharmacopoeia (30th ed.). London: Pharmaceutical Press. pp. 364–623.
^ Ereshefsky L, Saklad SR, Jann MW, Davis CM, Richards A, Seidel DR (May 1984). "Future of depot neuroleptic therapy: pharmacokinetic and pharmacodynamic approaches". The Journal of Clinical Psychiatry. 45 (5 Pt 2): 50–9. PMID 6143748.
^ ^a ^b Curry SH, Whelpton R, de Schepper PJ, Vranckx S, Schiff AA (April 1979). "Kinetics of fluphenazine after fluphenazine dihydrochloride, enanthate and decanoate administration to man". British Journal of Clinical Pharmacology. 7 (4): 325–31. doi:10.1111/j.1365-2125.1979.tb00941.x. PMC 1429660. PMID 444352.
^ Young D, Ereshefsky L, Saklad SR, Jann MW, Garcia N (1984). Explaining the pharmacokinetics of fluphenazine through computer simulations. (Abstract.). 19th Annual Midyear Clinical Meeting of the American Society of Hospital Pharmacists. Dallas, Texas.
^
^ Beresford R, Ward A (January 1987). "Haloperidol decanoate. A preliminary review of its pharmacodynamic and pharmacokinetic properties and therapeutic use in psychosis". Drugs. 33 (1): 31–49. doi:10.2165/00003495-198733010-00002. PMID 3545764.
^ Reyntigens AJ, Heykants JJ, Woestenborghs RJ, Gelders YG, Aerts TJ (1982). "Pharmacokinetics of haloperidol decanoate. A 2-year follow-up". International Pharmacopsychiatry. 17 (4): 238–46. doi:10.1159/000468580. PMID 7185768.
^ Loving NS (31 March 2012). "Effects of Behavior-Modifying Drug Investigated (AAEP 2011)". The Horse Media Group. Archived from the original on 6 January 2017. Retrieved 13 December 2016.