Fluphenazine
Generic: fluphenazine hydrochloride · Brand: Prolixin® · Class: 1st Generation Antipsychotic (High Potency)
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How It Works
Fluphenazine is a first-generation (typical) high-potency antipsychotic in the phenothiazine class. Like haloperidol, it works by potently blocking dopamine D2 receptors, making it highly effective for psychotic symptoms. It is available as oral tablets, oral concentrate, short-acting injection, and a long-acting decanoate injection (given every 2–4 weeks). The long-acting injectable form is particularly valuable for patients who have difficulty with medication adherence. It has a high risk of EPS (movement side effects) similar to haloperidol.
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What It Treats
SchizophreniaFDA-approved for psychotic disorders including schizophrenia and schizoaffective disorder
Chronic PsychosisLong-acting injectable particularly useful for maintenance treatment and adherence
Acute PsychosisShort-acting IM available for acute management
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Schizophrenia (oral) | 2.5–10 mg/day | 2.5–20 mg/day | 40 mg/day |
| Adults Decanoate (every 2–4 wks) | 12.5–25 mg | 12.5–50 mg | 100 mg per dose |
| Older Adults Start low | 1–2.5 mg/day | 1–5 mg/day | 20 mg/day |
Oral dose divided 2–3 times daily. Decanoate injection given every 2–4 weeks by a healthcare provider. Avoid getting liquid concentrate on skin — it can cause contact dermatitis.
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Side Effects
Common
- Muscle stiffness and rigidity (EPS)
- Restlessness (akathisia)
- Sedation
- Dry mouth
- Blurred vision
- Constipation
- Elevated prolactin
- Photosensitivity
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
- Severe photosensitivity (sunburn risk)
- Contact dermatitis from liquid form
Fluphenazine has a high rate of EPS — stiffness, spasms, and restlessness are common. The long-acting injectable is a major advantage for patients who struggle with daily medication. Sun protection is important as photosensitivity is a known side effect.
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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.
Sun ProtectionFluphenazine increases sun sensitivity — use sunscreen and protective clothing when outdoors.
Injectable OptionProlixin Decanoate injection every 2–4 weeks is available for better adherence.
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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