Haloperidol

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Haloperidol
Haloperidol.jpg
Haloperidol 5mg/ml solution for injection
Names
Pronunciation/ˌhælˈpɛrɪdɒl/
Trade namesHaldol, Serenace, others
  • 4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(4-fluorophenyl)butan-1-one
Clinical data
Drug classTypical antipsychotic
Main usesPsychosis, mania[1]
Side effectsMovement disorder, neuroleptic malignant syndrome, QT prolongation[2]
Pregnancy
category
  • AU: C
  • US: C (Risk not ruled out)
Routes of
use
by mouth, IM, IV, depot (as decanoate ester)
Defined daily dose3.3 to 8 mg[3]
External links
AHFS/Drugs.comMonograph
MedlinePlusa682180
Legal
License data
Legal status
Pharmacokinetics
Bioavailability60–70% (by mouth)[4]
Protein binding~90%[4]
MetabolismLiver-mediated[4]
Elimination half-life14–26 hours (IV), 20.7 hours (IM), 14–37 hours (oral)[4]
ExcretionBiliary (hence in feces) and in urine[4][5]
Chemical and physical data
FormulaC21H23ClFNO2
Molar mass375.87 g·mol−1
3D model (JSmol)
  • c1cc(ccc1C(=O)CCCN2CCC(CC2)(c3ccc(cc3)Cl)O)F
  • InChI=1S/C21H23ClFNO2/c22-18-7-5-17(6-8-18)21(26)11-14-24(15-12-21)13-1-2-20(25)16-3-9-19(23)10-4-16/h3-10,26H,1-2,11-15H2 checkY
  • Key:LNEPOXFFQSENCJ-UHFFFAOYSA-N checkY

Haloperidol, marketed under the trade name Haldol among others, is a typical antipsychotic medication.[2] Haloperidol is used in the treatment of schizophrenia, tics in Tourette syndrome, mania in bipolar disorder, nausea and vomiting, delirium, agitation, acute psychosis, and hallucinations in alcohol withdrawal.[2][6][7] It may be used by mouth or injection into a muscle or a vein.[2] Haloperidol typically works within 30 to 60 minutes.[2] A long-acting formulation may be used as an injection every four weeks in people with schizophrenia or related illnesses, who either forget or refuse to take the medication by mouth.[2]

Haloperidol may result in a movement disorder known as tardive dyskinesia which may be permanent.[2] Neuroleptic malignant syndrome and QT interval prolongation may occur.[2] In older people with psychosis due to dementia it results in an increased risk of death.[2] When taken during pregnancy it may result in problems in the infant.[2][8] It should not be used in people with Parkinson's disease.[2]

Haloperidol was discovered in 1958 by Paul Janssen.[9] It was made from pethidine (meperidine).[10] It is on the World Health Organization's List of Essential Medicines.[11] It is the most commonly used typical antipsychotic.[12] It is relatively inexpensive.[13][14][15] In 2017, it was the 296th most commonly prescribed medication in the United States, with more than one million prescriptions.[16][17]

Medical uses

Haloperidol is used in the control of the symptoms of:

Haloperidol was considered indispensable for treating psychiatric emergency situations,[24][25] although the newer atypical drugs have gained a greater role in a number of situations as outlined in a series of consensus reviews published between 2001 and 2005.[26][27][28]

In a 2013 comparison of 15 antipsychotics in schizophrenia, haloperidol demonstrated standard effectiveness. It was 13–16% more effective than ziprasidone, chlorpromazine, and asenapine, approximately as effective as quetiapine and aripiprazole, and 10% less effective than paliperidone.[29] A 2013 systematic review compared haloperidol to placebo in schizophrenia:[30]

Summary
Haloperidol often causes troublesome adverse effects. If there is no other antipsychotic drug, using haloperidol to offset the consequences of untreated schizophrenia is justified. Where a choice of drug is available, however, an alternative antipsychotic with less likelihood of adverse effects such as parkinsonism, akathisia and acute dystonias may be more desirable.[30]

Pregnancy and breastfeeding

Animal experiments indicate haloperidol is not teratogenic, but is embryotoxic in high doses. In humans, no controlled studies exist. Reports in pregnant women revealed possible damage to the fetus, although most of the women were exposed to multiple drugs during pregnancy. In addition, neonates exposed to antipsychotics are at risk for extrapyramidal and withdrawal symptoms following delivery, such as agitation, hypertonia, hypotonia, tremor, somnolence, respiratory distress, and feeding disorder. Haloperidol should be given during pregnancy only if the benefit to the mother outweighs the potential fetal risk.[21]

Haloperidol is excreted in breast milk. A few studies have examined the impact on breastfed infants and in most cases, there were no effects on infant growth and development.[31]

Other considerations

Skeletal formula of haloperidol decanoate. The decanoate group is highlighted in red.

During long-term treatment of chronic psychiatric disorders, the daily dose should be reduced to the lowest level needed for maintenance of remission. Sometimes, it may be indicated to terminate haloperidol treatment gradually.[32] In addition, during long-term use, routine monitoring including measurement of BMI, blood pressure, fasting blood sugar, and lipids, is recommended due to the risk of side effects.[33]

Other forms of therapy (psychotherapy, occupational therapy/ergotherapy, or social rehabilitation) should be instituted.[citation needed] PET imaging studies have suggested low doses are preferable. Clinical response was associated with at least 65% occupancy of D2 receptors, while greater than 72% was likely to cause hyperprolactinaemia and over 78% associated with extrapyramidal side effects. Doses of haloperidol greater than 5 mg increased the risk of side effects without improving efficacy.[34] Patients responded with doses under even 2 mg in first-episode psychosis.[35] For maintenance treatment of schizophrenia, an international consensus conference recommended a reduction dosage by about 20% every 6 months until a minimal maintenance dose is established.[33]

  • Depot forms are also available; these are injected deeply intramuscularly at regular intervals. The depot forms are not suitable for initial treatment, but are suitable for patients who have demonstrated inconsistency with oral dosages.[citation needed]

The decanoate ester of haloperidol (haloperidol decanoate) has a much longer duration of action, so is often used in people known to be noncompliant with medication by mouth. A dose is given by intramuscular injection once every two to four weeks.[36] The IUPAC name of haloperidol decanoate is [4-(4-chlorophenyl)-1-[4-(4-fluorophenyl)-4-oxobutyl]piperidin-4-yl] decanoate.

Topical formulations of haloperidol should not be used as treatment for nausea because research does not indicate this therapy is more effective than alternatives.[37]

Dosage

The defined daily dose of haloperidol is 8 mg by mouth.[38] The defined daily dose is 3.3 to 8 mg when given by injection.[3] Typical doses for schizophrenia are 5 to 20 mg per day by mouth but may be started as low as 1 mg per day.[2] Between 2 and 5 mg may be used by injection into a muscle for those who are significantly agitated.[2] Lower doses should be used in older people.[1] The maximum recommended dose of the short acting formulation by injection is 15 mg per day in adults and 5 mg in older people.[39] A long acting injection into a muscle can be given every 3 to 4 weeks at 10 times the dose a person is taking by mouth.[40]

For acute psychosis treatment should generally last at least three months while for chronic psychosis treatment should generally last at least a year.[1] Treatment for an episoid of mania may be from 3 to 6 weeks.[1] Treatment should be stopped gradually.[1]

Side effects

Sources for the following lists of side effects:[41][42][43][44]

As haloperidol is a high-potency typical antipsychotic, it tends to produce significant extrapyramidal side effects. According to a 2013 meta-analysis of the comparative efficacy and tolerability of 15 antipsychotic drugs it was the most prone of the 15 for causing extrapyramidal side effects.[29]

With more than 6 months of use 14 percent of users gain weight.[45] Haloperidol may be neurotoxic.[46]

Common (>1% incidence)

  • Extrapyramidal side effects including:
    • Akathisia (motor restlessness)
    • Dystonia (continuous spasms and muscle contractions)
    • Muscle rigidity
    • Parkinsonism (characteristic symptoms such as rigidity)
  • Hypotension
  • Anticholinergic side effects such as: (These adverse effects are more common than with lower-potency typical antipsychotics, such as chlorpromazine and thioridazine.)
    • Blurred vision
    • Constipation
    • Dry mouth
  • Somnolence (which is not a particularly prominent side effect, as is supported by the results of the aforementioned meta-analysis.[29])

Unknown frequency

Rare (<1% incidence)

Contraindications

  • Pre-existing coma, acute stroke
  • Severe intoxication with alcohol or other central depressant drugs
  • Known allergy against haloperidol or other butyrophenones or other drug ingredients
  • Known heart disease, when combined will tend towards cardiac arrest[citation needed]

Special cautions

  • A multiple-year study suggested this drug and other neuroleptic antipsychotic drugs commonly given to people with Alzheimer's with mild behavioral problems often make their condition worse and its withdrawal was even beneficial for some cognitive and functional measures.[47]
  • Elderly patients with dementia-related psychosis: analysis of 17 trials showed the risk of death in this group of patients was 1.6 to 1.7 times that of placebo-treated patients. Most of the causes of death were either cardiovascular or infectious in nature. It is not clear to what extent this observation is attributed to antipsychotic drugs rather than the characteristics of the patients. The drug bears a boxed warning about this risk.[21]
  • Impaired liver function, as haloperidol is metabolized and eliminated mainly by the liver
  • In patients with hyperthyreosis, the action of haloperidol is intensified and side effects are more likely.
  • IV injections: risk of hypotension or orthostatic collapse
  • Patients at special risk for the development of QT prolongation (hypokalemia, concomitant use of other drugs causing QT prolongation)
  • Patients with a history of leukopenia: a complete blood count should be monitored frequently during the first few months of therapy and discontinuation of the drug should be considered at the first sign of a clinically significant decline in white blood cells.[21]
  • Pre-existing Parkinson's disease[48] or dementia with Lewy bodies

Interactions

  • Amiodarone: Q-Tc interval prolongation (potentially dangerous change in heart rhythm).[49]
  • Amphetamine and methylphenidate: counteracts increased action of norepinephrine and dopamine in patients with narcolepsy or ADD/ADHD
  • Epinephrine: action antagonized, paradoxical decrease in blood pressure may result
  • Guanethidine: antihypertensive action antagonized
  • Levodopa: decreased action of levodopa
  • Lithium: rare cases of the following symptoms have been noted: encephalopathy, early and late extrapyramidal side effects, other neurologic symptoms, and coma.[50]
  • Methyldopa: increased risk of extrapyramidal side effects and other unwanted central effects
  • Other central depressants (alcohol, tranquilizers, narcotics): actions and side effects of these drugs (sedation, respiratory depression) are increased. In particular, the doses of concomitantly used opioids for chronic pain can be reduced by 50%.
  • Other drugs metabolized by the CYP3A4 enzyme system: inducers such as carbamazepine, phenobarbital, and rifampicin decrease plasma levels and inhibitors such as quinidine, buspirone, and fluoxetine increase plasma levels[21]
  • Tricyclic antidepressants: metabolism and elimination of tricyclics significantly decreased, increased toxicity noted (anticholinergic and cardiovascular side effects, lowering of seizure threshold)

Discontinuation

The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.[51] Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.[52] Other symptoms may include restlessness, increased sweating, and trouble sleeping.[52] Less commonly there may be a feeling of the world spinning, numbness, or muscle pains.[52] Symptoms generally resolve after a short period of time.[52]

There is tentative evidence that discontinuation of antipsychotics can result in psychosis.[53] It may also result in reoccurrence of the condition that is being treated.[54] Rarely tardive dyskinesia can occur when the medication is stopped.[52]

Overdose

Symptoms

Symptoms are usually due to side effects. Most often encountered are:

Treatment

Treatment is mostly symptomatic and involves intensive care with stabilization of vital functions. In early detected cases of oral overdose, induction of emesis, gastric lavage, and the use of activated charcoal can be tried. In the case of a severe overdose, antidotes such as bromocriptine or ropinirole may be used to treat the extrapyramidal effects caused by haloperidol, acting as dopamine receptor agonists.[citation needed] ECG and vital signs should be monitored especially for QT prolongation and severe arrhythmias should be treated with antiarrhythmic measures.[21]

Prognosis

In general, the prognosis of overdose is good, provided the person has survived the initial phase. An overdose of haloperidol can be fatal.[55]

Pharmacology

Haloperidol is a typical butyrophenone type antipsychotic that exhibits high affinity dopamine D2 receptor antagonism and slow receptor dissociation kinetics.[56] It has effects similar to the phenothiazines.[23] The drug binds preferentially to D2 and α1 receptors at low dose (ED50 = 0.13 and 0.42 mg/kg, respectively), and 5-HT2 receptors at a higher dose (ED50 = 2.6 mg/kg). Given that antagonism of D2 receptors is more beneficial on the positive symptoms of schizophrenia and antagonism of 5-HT2 receptors on the negative symptoms, this characteristic underlies haloperidol's greater effect on delusions, hallucinations and other manifestations of psychosis.[57] Haloperidol's negligible affinity for histamine H1 receptors and muscarinic M1 acetylcholine receptors yields an antipsychotic with a lower incidence of sedation, weight gain, and orthostatic hypotension though having higher rates of treatment emergent extrapyramidal symptoms.

Haloperidol acts on these receptors: (Ki)

Pharmacokinetics

By mouth

The bioavailability of oral haloperidol ranges from 60–70%. However, there is a wide variance in reported mean Tmax and T1/2 in different studies, ranging from 1.7 to 6.1 hours and 14.5 to 36.7 hours respectively.[4]

Intramuscular

The drug is well and rapidly absorbed with a high bioavailability when injected intramuscularly. The Tmax is 20 minutes in healthy individuals and 33.8 minutes in patients with schizophrenia. The mean T1/2 is 20.7 hours.[4] The decanoate injectable formulation is for intramuscular administration only and is not intended to be used intravenously. The plasma concentrations of haloperidol decanoate reach a peak at about six days after the injection, falling thereafter, with an approximate half-life of three weeks.[65] The decanote is on the World Health Organization's List of Essential Medicines as an alternative to fluphenazine.[66]

Intravenous

The bioavailability is 100% in intravenous (IV) injection, and the very rapid onset of action is seen within seconds. The T1/2 is 14.1 to 26.2 hours. The apparent volume of distribution is between 9.5 and 21.7 L/kg.[4] The duration of action is four to six hours.

Therapeutic concentrations

Plasma levels of five to 15 micrograms per liter are typically seen for therapeutic response (Ulrich S, et al. Clin Pharmacokinet. 1998). The determination of plasma levels is rarely used to calculate dose adjustments but can be useful to check compliance.

The concentration of haloperidol in brain tissue is about 20-fold higher compared to blood levels. It is slowly eliminated from brain tissue,[67] which may explain the slow disappearance of side effects when the medication is stopped.[67][68]

Distribution and metabolism

Haloperidol is heavily protein bound in human plasma, with a free fraction of only 7.5 to 11.6%. It is also extensively metabolized in the liver with only about 1% of the administered dose excreted unchanged in the urine. The greatest proportion of the hepatic clearance is by glucuronidation, followed by reduction and CYP-mediated oxidation, primarily by CYP3A4.[4]

History

Haloperidol was discovered by Paul Janssen.[69] It was developed in 1958 at the Belgian company Janssen Pharmaceutica and submitted to the first of clinical trials in Belgium later that year.[70][71]

Haloperidol was approved by the U.S. Food and Drug Administration (FDA) on 12 April 1967; it was later marketed in the U.S. and other countries under the brand name Haldol by McNeil Laboratories.[70]

Society and culture

Cost

Haloperidol is relatively inexpensive, being up to 100 fold less expensive than newer antipsychotics.[14][13] The daily defined dose for haloperidol is 8 mg.[72] In low and middle income countries the typical wholesale cost for 5 mg tablets is less $US0.01 when bought at least 1000 at a time.[72] The cost to the NHS in the United Kingdom is about £1.20 for 30 0.5 mg capsules and £15.00 for 38 5 mg tablets as of 2019.[73] The solution for injection is about £3.50 per 5 mg.[73] The wholesale cost in the United States is $US0.25 per 0.5 mg tablet and $0.53 per 5 mg tablet as of 2020.[74]

Brand names

Haloperidol is the INN, BAN, USAN, AAN approved name.

It is sold under the tradenames Aloperidin, Bioperidolo, Brotopon, Dozic, Duraperidol (Germany), Einalon S, Eukystol, Haldol (common tradename in the US and UK), Halosten, Keselan, Linton, Peluces, Serenace and Sigaperidol.[citation needed]

Veterinary use

Haloperidol is also used on many different kinds of animals for nonselective tranquilization and diminishing behavioral arousal, in veterinary and other settings including captivity management.[76]

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