Haloperidol
Generic: haloperidol · Brand: Haldol® · Class: 1st Generation Antipsychotic (High Potency)
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How It Works
Haloperidol is a first-generation (typical) high-potency antipsychotic and one of the most widely used antipsychotics in the world. It works by strongly blocking dopamine D2 receptors in the brain, which reduces hallucinations, delusions, and disorganized thinking. Because it is highly potent at D2 receptors, it is very effective for psychosis but carries a higher risk of movement-related side effects (EPS) than second-generation antipsychotics. It is available in oral, short-acting injectable, and long-acting injectable (Haldol Decanoate, given monthly) forms.
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What It Treats
SchizophreniaFDA-approved; highly effective for positive symptoms including hallucinations and delusions
Acute AgitationWidely used in emergency and inpatient settings via IM injection for rapid sedation
Tourette SyndromeFDA-approved for tics and vocal utterances in Tourette disorder
DeliriumCommonly used off-label in hospital settings to manage delirium
Nausea / VomitingUsed off-label at low doses for refractory nausea
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Schizophrenia (oral) | 0.5–2 mg 2–3x daily | 5–20 mg/day | 100 mg/day |
| Adults Acute Agitation (IM) | 2–5 mg | 2–10 mg | 20 mg/day |
| Adults Haldol Decanoate (monthly) | 10–15x oral dose | Monthly injection | 450 mg/month |
| Older Adults Start very low | 0.25–0.5 mg | 1–2 mg/day | 5 mg/day |
Oral tablets or liquid taken 2–3 times daily. IM injection available for acute situations. Long-acting Haldol Decanoate injection given once monthly for patients who have difficulty with daily oral medication.
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Side Effects
Common
- Muscle stiffness (EPS)
- Restlessness (akathisia)
- Sedation
- Dry mouth
- Constipation
- Blurred vision
- Dizziness
- Elevated prolactin
Call us if you notice
- Tardive dyskinesia (involuntary movements)
- Neuroleptic malignant syndrome (NMS)
- Severe muscle stiffness or rigidity
- High fever with muscle changes
- Severe restlessness (akathisia)
- Unusual eye movements or neck spasms
- Prolonged QT interval
- Elevated prolactin (breast changes, menstrual changes)
Haloperidol has a higher rate of movement side effects (EPS) than second-generation antipsychotics — stiffness, restlessness, and muscle spasms are common, especially early on. These are often manageable with dose adjustments or additional medications.
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Tips for Success
Same Time DailyTake at the same time each day for consistent levels in your system.
With FoodTaking with food reduces nausea and stomach upset.
Don't Stop AbruptlyAlways taper with your provider guidance — stopping suddenly can cause rebound symptoms.
Avoid AlcoholAlcohol increases sedation and side effects significantly.
Tell All ProvidersLet other prescribers know what you are taking — interactions matter.
Track SymptomsNote any unusual movements, mood changes, or new symptoms and share with your provider.
Monthly Injectable OptionIf daily pills are difficult, ask about Haldol Decanoate — a once-monthly injection that maintains steady levels.
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Important Safety Information
Tardive Dyskinesia — BLACK BOX WARNING: Long-term use can cause permanent involuntary movements of the face, tongue, lips, or limbs. Risk increases with dose and duration. Report any unusual movements immediately — early detection is critical.
Neuroleptic Malignant Syndrome (NMS): A rare but life-threatening reaction causing high fever, severe muscle rigidity, confusion, and unstable vital signs. Seek emergency care immediately if these occur.
Elderly Patients with Dementia: First-generation antipsychotics carry a black box warning for increased risk of death in elderly patients with dementia-related psychosis. Not approved for this use.
QT Prolongation: Many first-generation antipsychotics can affect heart rhythm. Tell your provider about any heart conditions or other medications that affect the heart.
Pregnancy & Breastfeeding: Discuss risks and benefits with your provider. Do not stop without consultation.
Drug Interactions: First-generation antipsychotics interact with many medications including other CNS depressants and anticholinergics. Always share your full medication list.
Questions? I am here.
Reach me between appointments if you have concerns about side effects, notice mood changes, or have questions about your medication.
360-389-3712
info@rootedmindspsychiatry.com