Chlorpromazine
Generic: chlorpromazine hydrochloride · Brand: Thorazine® · Class: 1st Generation Antipsychotic (Low Potency)
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How It Works
Chlorpromazine is a first-generation (typical) low-potency antipsychotic and the very first antipsychotic ever developed, introduced in 1952. Its discovery revolutionized psychiatry. It works by blocking dopamine D2 receptors along with a very broad range of other receptors including histamine, acetylcholine, norepinephrine, and serotonin — resulting in significant sedation, anticholinergic effects, and blood pressure lowering. As a low-potency agent, it has less EPS than high-potency agents like haloperidol, but much more sedation, weight gain, and orthostatic hypotension. It is one of the most sedating antipsychotics available.
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What It Treats
SchizophreniaFDA-approved; the original antipsychotic — still used today particularly when sedation is desired
Bipolar ManiaFDA-approved for manic episodes with or without psychosis
Intractable HiccupsFDA-approved — one of the few effective treatments for severe persistent hiccups
Nausea and VomitingFDA-approved for severe nausea and vomiting
Acute AgitationUsed in inpatient settings for sedation and agitation control
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Schizophrenia | 30–75 mg/day | 200–800 mg/day | 2000 mg/day |
| Adults Bipolar Mania | 25 mg 3x daily | 25–50 mg 3x daily | 400 mg/day |
| Adults Hiccups | 25–50 mg 3–4x daily | 25–50 mg 3–4x daily | 400 mg/day |
| Older Adults Start very low | 10–25 mg/day | 25–75 mg/day | 200 mg/day |
Taken 2–4 times daily with food. Highly sedating — evening dosing preferred when possible. Avoid getting liquid on skin — can cause contact dermatitis. Causes significant photosensitivity.
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Side Effects
Common
- Significant sedation
- Weight gain
- Dry mouth
- Constipation
- Blurred vision
- Orthostatic hypotension (dizziness on standing)
- Photosensitivity
- 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
- Severe orthostatic hypotension
- Agranulocytosis (rare)
- Pigmentary changes in skin and eyes (long-term)
Chlorpromazine is one of the most sedating medications in psychiatry — this can be useful when sedation is the goal but problematic for daily functioning. Sun protection is essential. Long-term use can cause bluish-gray skin discoloration and eye pigment changes.
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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 Protection EssentialChlorpromazine causes severe photosensitivity and long-term skin pigment changes. Use sunscreen and protective clothing every day.
Rise SlowlyChlorpromazine significantly lowers blood pressure — stand up slowly to avoid fainting.
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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.
Skin and Eye Pigmentation: Long-term use can cause bluish-gray discoloration of sun-exposed skin and pigment deposits in the eyes. Annual eye exams are recommended for long-term users.
Orthostatic Hypotension: Chlorpromazine significantly lowers blood pressure, especially when standing. Rise slowly from sitting or lying positions to avoid dizziness and falls.
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