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[[Category: Drugs]][[Category: typical antipsychotic ]]
[[Category: Drugs]][[Category: Typical Antipsychotic ]]
'''Haloperidol'''(中文:[[      ]])  is a typical antipsychotic medication. It is used in the treatment of various psychoses including:
*Schizophrenia
*Bipolar disorder
*Delirium
*in Tourette’s syndrome and severe tics
*in intractable hiccups
*in severe anxiety including for sedation of patients in intensive care  or palliative care
*in the management of nausea and vomiting of various causes


It may be used by mouth. A long-acting formulation may be used as an injection every 4 weeks in people with schizophrenia, who either forget or refuse to take the medication by mouth.
[[:Category: Antipsychotic Drug | '''Antipsychotic Drug''']]
Doses are expressed in terms of the equivalent amount of haloperidol. Haliperidol decanoate 141 mg is equivalent to about 100 mg of haloperiodl.
Dosages should be reduced in elderly or debilitated patients; a usual starting dose is half the normal adult dose.


==Pronunciation==
'''Drug class: [[:Category: Typical Antipsychotic  | Typical Antipsychotic]]
===Haloperidol 1.5mg===
[[File:Haloperidol 1.5mg.mp3]]


===Haloperidol 10mg===
'''Haloperidol (HALDOL)''' (中文:[[氟哌啶醇]])
[[File:Haloperidol 10mg.mp3]]
==Common Strengths of Haloperidol Tablet==
Haloperidol are available in the following strengths:
*Tablets: 1 mg, 1.5 mg, 5 mg, 10 mg, 20 mg
*Oral drops: 2 mg/mL
*Injectable solution: 5 mg/mL, 50 mg/mL and 100 mg/mL (decanoate)


===Haloperidol 1mg===
==Drug Trade Names of Haloperidol Tablet==
[[File:Haloperidol 1mg.mp3]]
*Haldol
*Serenace


==Drug Names==
==Drug Usage==
*Treatment of schizophrenia and other psychoses
*Control of tics and vocal utterances in Tourette's disorder
*Management of agitation, delirium, and acute psychosis
 
==Mechanism of Action==
Halperidol is a potent dopamine D<sub>2</sub> receptor antagonist in the brain.
 
==Route of Administration==
*Oral (tablets and liquid)
*Intramuscular injection
*Intravenous injection
 
==Dosages==
For schizophrenia/psychosis in adults:
*Oral: 0.5 - 5 mg 2 - 3 times daily, up to 30 mg/day for severe cases
*IM (lactate): 2 - 5 mg every 4 - 8 hours as needed, max 20 mg/day
*IM (decanoate):10 - 20 times daily oral dose given monthly
 
==Side Effects==
{| class="wikitable"
{| class="wikitable"
!Generic Name 藥名
!style="text-align: left"| Frequency
!HA Code 藥物代碼
!Adverse reactions
!Classification藥物分類
|-
|-
|Haloperidol Tab 1 mg
| rowspan="9" | '''Common
|HALO14
| Insomnia
|P1S1S3
|-
|-
|Haloperidol Tab 1.5 mg
| Drowsiness and sedation
|HALO03
|P1S1S3
|-
|-
|Haloperidol Tab 5 mg
| Dizziness
|HALO05
|P1S1S3
|-
|-
|Haloperiodl Drops 2mg/ml 30ml
| Dry mouth
|HALO16
|P1S1S3
|-
|-
|Haloperidol IM Injection 5mg/ml 1ml
| Blurred vision
|HALO08
|-
|P1S1S3
| Constipation
|}
|-
 
| Weight gain
==Mechanism of Action==
|-
Haloperidol is a typical antipsychotic that blocks dopamine D2 receptor with high affinity.
| Increased appetite
The presumed effectiveness of antipsychotic drugs relied on their ability to block dopamine receptors. This assumption arose from the dopamine hypothesis that maintains that both schizophrenia and bipolar disorder are a result of excessive dopamine activity.
|-
In addition, haloperidol also acts as an antagonist (blocking agent) on different postsynaptic and presynaptic receptors:
| Urinary retention
*Dopamine receptors (subtypes D1, D2, D3, D4 and D5), which account for its antipsychotic properties
|-
*Serotonin receptors (5-HT2, 5-HT6 and 5-HT7), with anxiolytic, antidepressant, and anti-aggressive properties
| rowspan="9" | '''Serious
*Histamine receptors (H1 receptors) accounting for sedation, antiemetic effect
| Extrapyramidal symptoms (movement disorders):
*α1- and α2-adrenergic receptors accounting for lowering of blood pressure, reflex tachycardia, vertigo, sedation, hypersalivation and incontinence as well as sexual dysfunction
*Muscle stiffness or spasms
*M1 muscarinic acetylcholine receptors causing anticholinergic symptoms such as dry mouth, blurred vision, constipation, difficulty to urinate, sinus tachycardia, and loss of memory.
*Tremors
 
*Restlessness (akathisia)
==Dosage==
*Parkinson-like symptoms
{| class="wikitable"
|-
!style="text-align: left"| Indication
| Taradive dyskinesia (potentially irreversible involuntary movements of face and tongue)
!style="text-align: left"| Dose
|-
| Neuroleptic malignant syndrome (fever, muscle rigidity, altered mental state)
|-
| Low white blood cell count (agranulocytosis)
|-
| Seizures
|-
|-
!style="text-align: left"|  
| QT prolongation leading to dangerous heart arrhythmias
*Schizophrenia
*Psychoses
*Mania
|By ''mouth
ADULT:
*Initially 2 - 20 mg once daily, or
*Initially 2 – 20 mg in divided doses
*Maintenance 1 – 3 mg 3 times a day, adjusted according to response
ELDERLY or debilitated patients:
*Initially 1 – 10 mg once daily, or
*Initially 1 – 10 mg daily in divided doses;
*Maintenance 1 – 3 mg 3 times a day, adjusted according to response
*Maximum 20 mg per day
CHILD 3 to 12 years:
*Initially 500 micrograms daily
*Increased to a usual dose of 1 to 4 mg daily
*Maximum of 6 mg daily
CHILD 13 to 17 years:
*Initially 500 micrograms daily
*Increased to a usual dose of 1 to 6 mg daily
(Maximum of 10 mg daily
 
By ''intramuscular injection
ADULT:
*2 – 5 mg, repeated dose given according to response and tolerability.
ELDERLY or debilitated patients:
*1 – 2.5 mg, repeated dose given according to response and tolerability.
*Maximum 12 mg per day
|-
|-
!style="text-align: left"| Agitation and restlessness in the elderly
| Hyperprolactinemia:
|By ''mouth
*Breast enlargement or milk production
ADULT:
*Menstrual changes
*0.75 – 1.5 mg 2-3 times a day, adjusted according to response
|-
|-
!style="text-align: left"|  
| Hypersensitivity reactions
*Tourette syndrome
*Severe tics
*Intractable hiccup
|By ''mouth
ADULT:
*1.5 – 3 mg 2 -3 times daily
*Maintenance 0.5 – 3 mg 3 times daily
ELDERLY or debilitated patients:
*0.75 – 1.5 mg 2-3 times daily
*Maintenance 0.5 – 1 mg 3 times daily
|-
|-
!style="text-align: left"| Nausea and vomiting of terminal illness
| Inappropriate antidiuretic hormone secretion
|By ''mouth
ADULT:
*1.5 mg 1-2 times daily, increased to
*5 – 10 mg daily in divided doses if necessary
|}
|}


During long-term treatment of chronic psychiatric disorders, the daily dose should be reduced to the lowest level needed for maintenance of remission. Doses of haloperidol greater than 5mg increased the risk of side effects without improving efficacy.
==Pharmacokinetics==
*Metabolism: Hepatic
*Elimination half-life: 14 to 26 hours (IV), 20.7 hours (IM), 14 to 37 hours (oral)
*Excretion: Biliary and renal
*Onset: 30 - 60 minutes (oral), rapid (IM/IV)
*Duration: 24 hours or longer
 
==Drug Precautions==
'''Pregnancy
 
Use only if potential benefits outweigh the risks. May cause extrapyramidal symptoms in newborns if used in the third trimester.
 
'''Breastfeeding
 
Use caution. Haloperidol is excreted in breast milk.
 
'''Children and Elderly
 
Use caution. Children may be more sensitive to side effects. Elderly patients may require lower doses and are at increased risk of adverse effects.
 
'''Monitoring Requirements
*Extrapyramidal symptoms
*ECG in patients at risk of QT prolongation
*Blood pressure
*Complete blood count
*Liver function tests
 
'''Drug Interactions
*Increased sedation with CNS depressants
*Increased risk of arrhythmias with drugs that prolong QT interval
*Reduced effectiveness of levodopa
*Increased plasma levels with CYP3A4 inhibitors
 
==FAQ==
'''How Should I Take the Tablet?
 
It can be taken with or without food.
 
'''What should I avoid while taking?
 
Avoid alcohol and activities requiring mental alertness until you know how haloperidol affects you.
 
'''What Happens if I Miss a Dose?
 
Take the missed dose as soon as you remember unless it is almost time for your next dose. Do not double doses.

Latest revision as of 01:31, 29 July 2024


Antipsychotic Drug

Drug class: Typical Antipsychotic

Haloperidol (HALDOL) (中文:氟哌啶醇)

Common Strengths of Haloperidol Tablet[edit]

Haloperidol are available in the following strengths:

  • Tablets: 1 mg, 1.5 mg, 5 mg, 10 mg, 20 mg
  • Oral drops: 2 mg/mL
  • Injectable solution: 5 mg/mL, 50 mg/mL and 100 mg/mL (decanoate)

Drug Trade Names of Haloperidol Tablet[edit]

  • Haldol
  • Serenace

Drug Usage[edit]

  • Treatment of schizophrenia and other psychoses
  • Control of tics and vocal utterances in Tourette's disorder
  • Management of agitation, delirium, and acute psychosis

Mechanism of Action[edit]

Halperidol is a potent dopamine D2 receptor antagonist in the brain.

Route of Administration[edit]

  • Oral (tablets and liquid)
  • Intramuscular injection
  • Intravenous injection

Dosages[edit]

For schizophrenia/psychosis in adults:

  • Oral: 0.5 - 5 mg 2 - 3 times daily, up to 30 mg/day for severe cases
  • IM (lactate): 2 - 5 mg every 4 - 8 hours as needed, max 20 mg/day
  • IM (decanoate):10 - 20 times daily oral dose given monthly

Side Effects[edit]

Frequency Adverse reactions
Common Insomnia
Drowsiness and sedation
Dizziness
Dry mouth
Blurred vision
Constipation
Weight gain
Increased appetite
Urinary retention
Serious Extrapyramidal symptoms (movement disorders):
  • Muscle stiffness or spasms
  • Tremors
  • Restlessness (akathisia)
  • Parkinson-like symptoms
Taradive dyskinesia (potentially irreversible involuntary movements of face and tongue)
Neuroleptic malignant syndrome (fever, muscle rigidity, altered mental state)
Low white blood cell count (agranulocytosis)
Seizures
QT prolongation leading to dangerous heart arrhythmias
Hyperprolactinemia:
  • Breast enlargement or milk production
  • Menstrual changes
Hypersensitivity reactions
Inappropriate antidiuretic hormone secretion

Pharmacokinetics[edit]

  • Metabolism: Hepatic
  • Elimination half-life: 14 to 26 hours (IV), 20.7 hours (IM), 14 to 37 hours (oral)
  • Excretion: Biliary and renal
  • Onset: 30 - 60 minutes (oral), rapid (IM/IV)
  • Duration: 24 hours or longer

Drug Precautions[edit]

Pregnancy

Use only if potential benefits outweigh the risks. May cause extrapyramidal symptoms in newborns if used in the third trimester.

Breastfeeding

Use caution. Haloperidol is excreted in breast milk.

Children and Elderly

Use caution. Children may be more sensitive to side effects. Elderly patients may require lower doses and are at increased risk of adverse effects.

Monitoring Requirements

  • Extrapyramidal symptoms
  • ECG in patients at risk of QT prolongation
  • Blood pressure
  • Complete blood count
  • Liver function tests

Drug Interactions

  • Increased sedation with CNS depressants
  • Increased risk of arrhythmias with drugs that prolong QT interval
  • Reduced effectiveness of levodopa
  • Increased plasma levels with CYP3A4 inhibitors

FAQ[edit]

How Should I Take the Tablet?

It can be taken with or without food.

What should I avoid while taking?

Avoid alcohol and activities requiring mental alertness until you know how haloperidol affects you.

What Happens if I Miss a Dose?

Take the missed dose as soon as you remember unless it is almost time for your next dose. Do not double doses.

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