Typical antipsychotic

Typical antipsychotic
Drug class
Skeletal formula of chlorpromazine, the first antipsychotic
Names
Stem-peridol[1]
Other namesFirst generation antipsychotics, conventional antipsychotics, classical neuroleptics, traditional antipsychotics, major tranquilizers
Clinical data
UsesAgitation, schizophrenia, bipolar, nausea[2]
Side effectsInvoluntary movement disorders, including tardive dyskinesia, sleepiness, low blood pressure, sexual dysfunction[2]
Common typesChlorpromazine, haloperidol, prochlorperazine[2]

Typical antipsychotics are a class of medication of the antipsychotic type.[3] They are primarily used for agitation, schizophrenia, bipolar, and nausea.[2] Other uses may include hiccups.[2] They can be taken by mouth or used by injection.[3] Long acting injectable formulations are also available.[3]

Side effects may include involuntary movement disorders, including tardive dyskinesia, sleepiness, low blood pressure, and sexual dysfunction.[2] Other serious side effects may include neuroleptic malignant syndrome and QT prolongation.[2] They cause less weight gain and diabetes than atypical antipsychotics.[3] In dementia they increase the risk of death.[2] They are believed to work by blocking receptors in the brain for dopamine.[2]

They were first developed in the 1950s with chlorpromazine.[4] They are available as generic medication and are generally relatively inexpensive.[2] Some of the long acting injectable formulations are more expensive.[2]

Types

Traditional antipsychotics are classified as high-potency, mid-potency, or low-potency based on their potency for the D2 receptor:

PotencyExamples Side effects
Highfluphenazine and haloperidolmore extrapyramidal side effects (EPS) and less antihistaminic effects (e.g. sedation), alpha adrenergic antagonism (e.g. orthostatic hypotension), and anticholinergic effects (e.g. dry mouth)
Middleperphenazine and loxapineintermediate D2 affinity, with more off-target effects than high-potency agents
Lowchlorpromazineless risk of EPS but more antihistaminic effects, alpha adrenergic antagonism, and anticholinergic effects

Prochlorperazine and pimozide are less commonly used to treat psychotic states, and so are sometimes excluded from this classification.[5]

A related concept to D2 potency is the concept of "chlorpromazine equivalence", which provides a measure of the relative effectiveness of antipsychotics.[6][7] The measure specifies the amount (mass) in milligrams of a given drug that must be administered in order to achieve desired effects equivalent to those of 100 milligrams of chlorpromazine.[8] Another method is "defined daily dose" (DDD), which is the assumed average dose of an antipsychotic that an adult would receive during long-term treatment.[8] DDD is primarily used for comparing the utilization of antipsychotics (e.g. in an insurance claim database), rather than comparing therapeutic effects between antipsychotics.[8] Maximum dose methods are sometimes used to compare between antipsychotics as well.[8] It is important to note that these methods do not generally account for differences between the tolerability (i.e. the risk of side effects) or the safety between medications.[8]

For a list of typical antipsychotics organized by potency, see below:

Low potency

Medium potency

High potency

Where: † indicates products that have since been discontinued.[9]

Long-acting injectables

Some typical antipsychotics have been formulated as a long-acting injectable (LAI), or "depot", formulation. Depot injections are also used on persons under involuntary commitment to force compliance with a court treatment order when the person would refuse to take daily oral medication. This has the effect of dosing a person who doesn't consent to take the drug. The United Nations Special Rapporteur On Torture has classified this as a human rights violation and cruel or inhuman treatment.[10]

The first LAI antipsychotics (often referred to as simply "LAIs") were the typical antipsychotics fluphenazine and haloperidol.[11] Both fluphenazile and haloperidol are formulated as decanoates, referring to the attachment of a decanoic acid group to the antipsychotic molecule.[11] These are then dissolved in an organic oil.[11] Together, these modifications prevent the active medications from being released immediately upon injection, attaining a slow release of the active medications (note, though, that the fluphenazine decanoate product is unique for reaching peak fluphenazine blood levels within 24 hours after administration[12]).[11] Fluphenazine decanoate can be administered every 7 to 21 days (usually every 14 to 28 days),[12] while haloperidol decanoate can be administered every 28 days, though some people receive more or less frequent injections.[11] If a scheduled injection of either haloperidol decanoate or fluphenazine decanoate is missed, recommendations for administering make-up injectable dose(s) or providing antipsychotics to be taken by mouth vary by, e.g., how long ago the last injection was and how many previous injections the person has received (i.e., if steady state levels of the medication have been reached or not).[12]

Both of the typical antipsychotic LAIs are inexpensive in comparison to the atypical LAIs.[11] Doctors usually prefer atypical LAIs over typical LAIs due to the differences in adverse effects between typical and atypical antipsychotics in general.[12]

Pharmacokinetics of long-acting injectable antipsychotics
MedicationBrand nameClassVehicleDosageTmaxt1/2 singlet1/2 multiplelogPcRef
Aripiprazole lauroxilAristadaAtypicalWatera441–1064 mg/4–8 weeks24–35 days ?54–57 days7.9–10.0
Aripiprazole monohydrateAbilify MaintenaAtypicalWatera300–400 mg/4 weeks7 days ?30–47 days4.9–5.2
Bromperidol decanoateImpromen DecanoasTypicalSesame oil40–300 mg/4 weeks3–9 days ?21–25 days7.9[13]
Clopentixol decanoateSordinol DepotTypicalViscoleob50–600 mg/1–4 weeks4–7 days ?19 days9.0[14]
Flupentixol decanoateDepixolTypicalViscoleob10–200 mg/2–4 weeks4–10 days8 days17 days7.2–9.2[14][15]
Fluphenazine decanoateProlixin DecanoateTypicalSesame oil12.5–100 mg/2–5 weeks1–2 days1–10 days14–100 days7.2–9.0[16][17][18]
Fluphenazine enanthateProlixin EnanthateTypicalSesame oil12.5–100 mg/1–4 weeks2–3 days4 days ?6.4–7.4[17]
FluspirileneImap, RedeptinTypicalWatera2–12 mg/1 week1–8 days7 days ?5.2–5.8[19]
Haloperidol decanoateHaldol DecanoateTypicalSesame oil20–400 mg/2–4 weeks3–9 days18–21 days7.2–7.9[20][21]
Olanzapine pamoateZyprexa RelprevvAtypicalWatera150–405 mg/2–4 weeks7 days ?30 days–
Oxyprothepin decanoateMeclopinTypical ? ? ? ? ?8.5–8.7
Paliperidone palmitateInvega SustennaAtypicalWatera39–819 mg/4–12 weeks13–33 days25–139 days ?8.1–10.1
Perphenazine decanoateTrilafon DekanoatTypicalSesame oil50–200 mg/2–4 weeks ? ?27 days8.9
Perphenazine enanthateTrilafon EnanthateTypicalSesame oil25–200 mg/2 weeks2–3 days ?4–7 days6.4–7.2[22]
Pipotiazine palmitatePiportil LongumTypicalViscoleob25–400 mg/4 weeks9–10 days ?14–21 days8.5–11.6[15]
Pipotiazine undecylenatePiportil MediumTypicalSesame oil100–200 mg/2 weeks ? ? ?8.4
RisperidoneRisperdal ConstaAtypicalMicrospheres12.5–75 mg/2 weeks21 days ?3–6 days–
Zuclopentixol acetateClopixol AcuphaseTypicalViscoleob50–200 mg/1–3 days1–2 days1–2 days4.7–4.9
Zuclopentixol decanoateClopixol DepotTypicalViscoleob50–800 mg/2–4 weeks4–9 days ?11–21 days7.5–9.0
Note: All by intramuscular injection. Footnotes: a = Microcrystalline or nanocrystalline aqueous suspension. b = Low-viscosity vegetable oil (specifically fractionated coconut oil with medium-chain triglycerides). c = Predicted, from PubChem and DrugBank. Sources: Main: See template.

Medical uses

Bottle containing loxapine capsules, a mid-potency typical antipsychotic.

Typical antipsychotics block the dopamine 2 receptor (D2) receptor, causing a tranquilizing effect.[23] It is thought that 60-80% of D2 receptors need to be occupied for antipsychotic effect.[23] For reference, the typical antipsychotic haloperidol tends to block about 80% of D2 receptors at doses ranging from 2 to 5 mg per day.[23] On the aggregate level, no typical antipsychotic is more effective than any other, though people will vary in which antipsychotic they prefer to take (based on individual differences in tolerability and effectiveness).[23] Typical antipsychotics can be used to treat, e.g., schizophrenia or severe agitation.[23] Haloperidol, due to the availability of a rapid-acting injectable formulation and decades of use, remains the most commonly used tranquilizer for chemical restraint in the emergency department setting (in the interests of hospital staff, not to meet a medical need of the patient.)[23]

Side effects

Further information: Phenothiazines

Side effects vary among the various agents in this class of medications, but common effects include: dry mouth, muscle stiffness, muscle cramping, tremors, EPS and weight gain. EPS refers to a cluster of symptoms consisting of akathisia, parkinsonism, and dystonia. Anticholinergics such as benztropine and diphenhydramine are commonly prescribed to treat the EPS. 4% of users develop rabbit syndrome while on typical antipsychotics.[24]

There is a low risk of developing a serious condition called tardive dyskinesia as a side effect of antipsychotics, including typical antipsychotics. The risk of developing tardive dyskinesia after chronic typical antipsychotic usage varies on several factors, such as age and gender, as well as the specific antipsychotic used. The commonly reported incidence of TD among younger patients is about 5% per year. Among older patients incidence rates as high as 20% per year have been reported. The average prevalence is approximately 30%.[25] There are few treatments that have consistently been shown to be effective for the treatment of tardive dyskinesia, though an VMAT2 inhibitor like valbenazine may help.[26] The atypical antipsychotic clozapine has also been suggested as an alternative antipsychotic for patients experiencing tardive dyskinesia.[27] Tardive dyskinesia may reverse upon discontinuation of the offending agent or it may be irreversible, withdrawal may also make tardive dyskinesia more severe.[28]

Neuroleptic malignant syndrome, or NMS, is a rare, but potentially fatal side effect of antipsychotic treatment. NMS is characterized by fever, muscle rigidity, autonomic dysfunction, and altered mental status. Treatment includes discontinuation of the offending agent and supportive care.

The role of typical antipsychotics has come into question recently as studies have suggested that typical antipsychotics may increase the risk of death in elderly patients. A retrospective cohort study from the New England Journal of Medicine on Dec. 1, 2005 showed an increase in risk of death with the use of typical antipsychotics that was on par with the increase shown with atypical antipsychotics.[29] This has led some to question the common use of antipsychotics for the treatment of agitation in the elderly, particularly with the availability of alternatives such as mood stabilizing and antiepileptic drugs.

History

Main article: Antipsychotic § History
Advertisement for Thorazine (chlorpromazine) from the 1950s, reflecting the perceptions of psychosis, including the now-discredited perception of a tendency towards violence, from the time when antipsychotics were discovered[30]

The original antipsychotic drugs were happened upon largely by chance and then tested for their effectiveness. The first, chlorpromazine, was developed as a surgical anesthetic after an initial report in 1952.[23] It was first used in psychiatric institutions because of its powerful tranquilizing effect; at the time it was regarded as a non-permanent "pharmacological lobotomy".[31] (Note that "tranquilizing" here only refers to changes in external behavior, while the experience a person has internally may be one of increased agitation but inability to express it.)[32][33]

Until the 1970s there was debate within psychiatry on the most appropriate term to describe this case of medication.[34] In the late 1950s the most widely used term was "neuroleptic", followed by "major tranquilizer" and then "ataraxic".[34] The word neuroleptic was coined in 1955 by Delay and Deniker after their discovery (1952) of the antipsychotic effects of chlorpromazine.[34] It is derived from the Greek: "νεῦρον" (neuron, originally meaning "sinew" but today referring to the nerves) and "λαμβάνω" (lambanō, meaning "take hold of"). Thus, the word means taking hold of one's nerves. It was often taken to refer also to common effects such as reduced activity in general, as well as lethargy and impaired motor control. Although these effects are unpleasant and harmful, they were, along with akathisia, considered a reliable sign that the drug was working.[31] These terms have been largely replaced by the term "antipsychotic" in medical and advertising literature, which refers to the medication's more-marketable effects.[34]

References

  1. ↑ "Generic Name Stems - Drug Information Portal - U.S. National Library of Medicine". druginfo.nlm.nih.gov. Archived from the original on 13 April 2021. Retrieved 13 March 2021.
  2. 1 2 3 4 5 6 7 8 9 10 11 Hitchings, Andrew; Lonsdale, Dagan; Burrage, Daniel; Baker, Emma (2019). The Top 100 Drugs: Clinical Pharmacology and Practical Prescribing (2nd ed.). Elsevier. p. 78. ISBN 978-0-7020-7442-4. Archived from the original on 2021-05-22. Retrieved 2021-11-09.
  3. 1 2 3 4 Chokhawala, K; Stevens, L (January 2021). "Antipsychotic Medications". PMID 30137788. {{cite journal}}: Cite journal requires |journal= (help)
  4. ↑ Shen WW (1999). "A history of antipsychotic drug development". Comprehensive Psychiatry. 40 (6): 407–14. doi:10.1016/s0010-440x(99)90082-2. PMID 10579370.
  5. ↑ Gitlin MJ (1996). The psychotherapist's guide to psychopharmacology. New York: Free Press. p. 392. ISBN 0-684-82737-9.
  6. ↑ Woods SW (June 2003). "Chlorpromazine equivalent doses for the newer atypical antipsychotics". The Journal of Clinical Psychiatry. 64 (6): 663–7. doi:10.4088/JCP.v64n0607. PMID 12823080.
  7. ↑ Rijcken CA, Monster TB, Brouwers JR, de Jong-van den Berg LT (December 2003). "Chlorpromazine equivalents versus defined daily doses: how to compare antipsychotic drug doses?". Journal of Clinical Psychopharmacology. 23 (6): 657–9. doi:10.1097/01.jcp.0000096247.29231.3a. PMID 14624195.
  8. 1 2 3 4 5 Patel MX, Arista IA, Taylor M, Barnes TR (September 2013). "How to compare doses of different antipsychotics: a systematic review of methods". Schizophrenia Research. 149 (1–3): 141–8. doi:10.1016/j.schres.2013.06.030. PMID 23845387.
  9. ↑ Martindale: The Complete Drug Reference. The Royal Pharmaceutical Society of Great Britain. 2013. Archived from the original on 15 September 2019. Retrieved 2 November 2013.
  10. ↑ "Archive copy" (PDF). Archived (PDF) from the original on 2020-11-12. Retrieved 2021-03-05.{{cite web}}: CS1 maint: archived copy as title (link)
  11. 1 2 3 4 5 6 Kennedy WK (2012). "When and how to use long-acting injectable antipsychotics". Current Psychiatry. 11 (8): 40–43. Archived from the original on 2020-06-22. Retrieved 2020-06-20.
  12. 1 2 3 4 Carpenter J, Wong KK (2018). "Long-acting injectable antipsychotics: What to do about missed doses". Current Psychiatry. 17 (7): 10–12, 14–19, 56. Archived from the original on 2020-06-22. Retrieved 2020-06-20.
  13. ↑ 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.
  14. 1 2 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.
  15. 1 2 Reynolds JE (1993). "Anxiolytic sedatives, hypnotics and neuroleptics.". Martindale: The Extra Pharmacopoeia (30th ed.). London: Pharmaceutical Press. pp. 364–623.
  16. ↑ 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.
  17. 1 2 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.
  18. ↑ 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.
  19. ↑ Janssen PA, Niemegeers CJ, Schellekens KH, Lenaerts FM, Verbruggen FJ, van Nueten JM, et al. (November 1970). "The pharmacology of fluspirilene (R 6218), a potent, long-acting and injectable neuroleptic drug". Arzneimittel-Forschung. 20 (11): 1689–98. PMID 4992598.
  20. ↑ 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.
  21. ↑ 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.
  22. ↑ Larsson M, Axelsson R, Forsman A (1984). "On the pharmacokinetics of perphenazine: a clinical study of perphenazine enanthate and decanoate". Current Therapeutic Research. 36 (6): 1071–88.
  23. 1 2 3 4 5 6 7 Schatzberg's Manual of Clinical Psychopharmacology (Ninth ed.). American Psychiatric Association Publishing. 2019. ISBN 978-1-61537-230-0. Archived from the original on 2020-06-21. Retrieved 2020-06-21.
  24. ↑ Yassa R, Lal S (May 1986). "Prevalence of the rabbit syndrome". The American Journal of Psychiatry. 143 (5): 656–7. doi:10.1176/ajp.143.5.656. PMID 2870650.
  25. ↑ Llorca PM, Chereau I, Bayle FJ, Lancon C (May 2002). "Tardive dyskinesias and antipsychotics: a review". European Psychiatry. 17 (3): 129–38. doi:10.1016/S0924-9338(02)00647-8. PMID 12052573.
  26. ↑ Office of the Commissioner (24 March 2020). "FDA approves first drug to treat tardive dyskinesia". FDA. Archived from the original on 8 August 2020. Retrieved 18 June 2020.
  27. ↑ Pardis P, Remington G, Panda R, Lemez M, Agid O (October 2019). "Clozapine and tardive dyskinesia in patients with schizophrenia: A systematic review". Journal of Psychopharmacology. 33 (10): 1187–1198. doi:10.1177/0269881119862535. PMID 31347436.
  28. ↑ "Archived copy". Archived from the original on 2017-01-31. Retrieved 2017-01-18.{{cite web}}: CS1 maint: archived copy as title (link)
  29. ↑ Wang PS, Schneeweiss S, Avorn J, Fischer MA, Mogun H, Solomon DH, Brookhart MA (December 2005). "Risk of death in elderly users of conventional vs. atypical antipsychotic medications". The New England Journal of Medicine. 353 (22): 2335–41. doi:10.1056/NEJMoa052827. PMID 16319382. Archived from the original on 2021-08-27. Retrieved 2019-12-16.
  30. ↑ The text reads: "When the patient lashes out against 'them' - THORAZINE (brand of chlorpromazine) quickly puts an end to his violent outburst. 'Thorazine' is especially effective when the psychotic episode is triggered by delusions or hallucinations. At the outset of treatment, Thorazine's combination of antipsychotic and sedative effects provides both emotional and physical calming. Assaultive or destructive behavior is rapidly controlled. As therapy continues, the initial sedative effect gradually disappears. But the antipsychotic effect continues, helping to dispel or modify delusions, hallucinations and confusion, while keeping the patient calm and approachable. SMITH KLINE AND FRENCH LABORATORIES leaders in psychopharmaceutical research."
  31. 1 2 Pieters T, Majerus B (December 2011). "The introduction of chlorpromazine in Belgium and the Netherlands (1951-1968); tango between old and new treatment features". Studies in History and Philosophy of Biological and Biomedical Sciences. 42 (4): 443–52. doi:10.1016/j.shpsc.2011.05.003. PMID 22035718. Archived from the original on 9 July 2017.
  32. ↑ "Akathisia: Symptoms, Causes, Diagnosis, Treatment | RxISK". rxisk.org. Archived from the original on 2021-05-03. Retrieved 2021-03-23.
  33. ↑ Muench, John (1 March 2010). "Adverse Effects Of Antipsychotics". American Family Physician Journal. Archived from the original on 6 February 2021. Retrieved 23 March 2021.
  34. 1 2 3 4 King C, Voruganti LN (May 2002). "What's in a name? The evolution of the nomenclature of antipsychotic drugs". Journal of Psychiatry & Neuroscience. 27 (3): 168–75. PMC 161646. PMID 12066446.
This article is issued from Offline. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.