Basic Largactil Information

• INN (International Nonproprietary Name): Chlorpromazine
• Brand Names Available In United Kingdom: Largactil (tablets, oral solution, injection)
• ATC Code: N05AA01
• Forms & Dosages: Tablets 10 mg, 25 mg, 50 mg, 100 mg, 200 mg; oral solution commonly 10 mg/mL; injection 25 mg/mL
• Manufacturers In United Kingdom: Sanofi historically for Largactil; also widely available as generic chlorpromazine hydrochloride from multiple suppliers
• Registration Status In United Kingdom: Licensed and marketed under brand and generic names (Largactil/chlorpromazine)
• OTC / Rx Classification: Prescription-only (Rx) in all jurisdictions

Critical Warnings & Restrictions

Who needs protection first? Chlorpromazine (Largactil) is a potent medicine and must be treated with caution.

It is a prescription-only medicine and carries important safety risks for several defined groups.

Absolute contraindications include comatose states, known hypersensitivity to phenothiazines, severe bone marrow depression, pheochromocytoma and infants under six months.

Relative contraindications that require specialist review and enhanced monitoring include hepatic or renal impairment, cardiovascular disease with QT risk, epilepsy, Parkinson’s disease, dementia and pregnancy.

Elderly patients need “start low, go slow” dosing and frequent review for orthostatic hypotension, sedation and anticholinergic effects.

• Baseline observations and monitoring items:
• Blood pressure and pulse
• Weight and metabolic baseline
• Electrocardiogram to assess QT interval
• Full blood count
• Liver function tests
• Medication reconciliation for interactions
• Pregnancy test where applicable

Pre-treatment checklist for prescribers and pharmacists:

• Confirm absolute contraindications are absent.
• Obtain baseline BP, pulse, weight, ECG, FBC and LFTs.
• Review all current medicines for interactions and CYP modifiers.
• Discuss reproductive status and pregnancy risk where relevant.

Pharmacists should counsel patients about photosensitivity and the risk of drowsiness affecting driving.

Serious adverse reactions should be reported via the MHRA Yellow Card scheme.

Available UK dosing forms and strengths include tablets 10–200 mg, oral solution (commonly 10 mg/mL) and injection 25 mg/mL.

Can I Drive After Taking It In The UK?

Chlorpromazine commonly causes drowsiness, slowed reaction times and orthostatic hypotension.

The DVLA expects patients to inform their clinician if treatment affects driving ability.

If you feel sleepy, dizzy or less alert, do not drive or operate machinery and seek pharmacist or GP advice.

Report persistent impairment to your prescriber and discuss dose adjustments or alternative treatments.

Usage Basics

INN, Brand Names Available In The UK

INN: chlorpromazine.

Prominent UK brand: Largactil, supplied as tablets, oral solution and injection.

ATC classification: N05AA01, a first‑generation typical antipsychotic of the phenothiazine family.

Legal Classification (POM, P, GSL)

Chlorpromazine is classified as a prescription‑only medicine (POM) across the UK and is not available over the counter.

Pharmacies such as Boots, LloydsPharmacy and Superdrug dispense it on NHS or private prescriptions, and MHRA‑registered online pharmacies supply it via valid prescriptions.

Available strengths and forms in the UK include:

• Tablets: 10 mg, 25 mg, 50 mg, 100 mg, 200 mg.
• Oral solution: commonly 10 mg/mL.
• Injection (IM/IV): 25 mg/mL.

The drug is listed on the WHO Model List of Essential Medicines and is widely available as generic chlorpromazine hydrochloride globally.

Dosing Guide

Standard Regimens (NHS Guidelines)

For psychosis and schizophrenia, initial oral dosing commonly starts at 25–100 mg three times daily and is titrated to effect.

Typical maintenance dosing often falls between 200–800 mg per day, divided into two to four doses as appropriate.

For nausea or as an antiemetic, lower doses of 10–25 mg every 4–6 hours may be used.

For preoperative anxiolysis, a single dose of 25–50 mg about one hour before a procedure is typical.

Adjustments For Comorbidities

Children use weight‑based dosing; a starting dose around 0.5–0.55 mg/kg per dose is common for severe behavioural disturbance, with close monitoring.

In elderly patients, start at roughly half the adult starting dose and titrate slowly while monitoring for hypotension and sedation.

Renal or hepatic impairment requires dose reduction and increased clinical and laboratory monitoring because of the risk of accumulation.

• Starting dose ranges:
• Psychosis: 25–100 mg three times daily initially.
• Maintenance: typically 200–800 mg/day divided.
• Nausea: 10–25 mg every 4–6 hours.
• Preoperative: 25–50 mg one hour preop.

Monitoring checklist and suggested frequencies:

• Vital signs (BP, pulse): baseline, weekly until stable, then per clinic protocol.
• ECG: baseline and if cardiac symptoms or QT‑prolonging co‑medications are present.
• Full blood count and LFTs: baseline and periodically during treatment.

Never change dose or stop treatment without prescriber approval.

What If I Miss A Dose?

If a dose is missed, take it as soon as you remember unless it is near the time for your next scheduled dose.

Do not double the dose to make up for a missed one.

If you miss doses frequently, contact your GP or pharmacist to discuss adherence support.

In cases of suspected overdose, seek emergency medical assistance immediately.

Interaction Chart

Food And Drinks (Alcohol, Tea/Coffee, Diet Habits)

Chlorpromazine potentiates the effects of other central nervous system depressants such as alcohol, benzodiazepines and opioids, increasing sedation and the risk of respiratory depression.

Caffeine or large amounts of tea or coffee may mask sedation but can aggravate akathisia in some patients.

Avoid excess alcohol while being treated with chlorpromazine.

Common Drug Conflicts (MHRA Yellow Card Data)

Drugs that prolong the QT interval (for example some macrolide antibiotics and certain antidepressants) can increase cardiac risk when combined with chlorpromazine.

Co-prescribing with strong CYP inhibitors or inducers may alter chlorpromazine plasma levels and requires dose review and monitoring.

Antihistamines and opioids add to sedation risk and should be co-prescribed with caution.

Injection formulations can exacerbate parenteral hypotension when given with other vasoactive drugs, so monitor blood pressure closely after IM/IV dosing.

Pharmacists should complete a medication reconciliation checklist and report suspected interactions via the MHRA Yellow Card.

User Reports & Trends

What do patients say online? UK forums and patient platforms report a mix of positive and negative experiences with Largactil.

Reported benefits include rapid calming in acute agitation and useful antiemetic effects in short courses.

Common negatives mentioned by users are daytime drowsiness, weight gain, extrapyramidal symptoms and photosensitivity.

Perception varies between older typical antipsychotics like Largactil and newer atypicals, with many patients noting differences in side‑effect profiles.

• Recurring patient concerns:
• Drowsiness affecting daily life and work.
• Movement side effects such as tremor or restlessness.
• Weight gain and metabolic worries.
• Stigma associated with older antipsychotics.

• Reported benefits:
• Rapid symptom control for agitation.
• Low cost and wide availability.
• Antiemetic benefit in short courses.

Clinicians should contextualise online reports, correct misinformation and direct patients to evidence‑based resources such as NHS and Patient.info for balanced information.

Online pharmacy reviews also highlight access issues and occasional prescription delays in some regions.

Access & Purchase Options

Boots, LloydsPharmacy, Superdrug

Primary access routes in the UK are NHS prescriptions issued by a GP or specialist and dispensed at community pharmacy chains such as Boots, LloydsPharmacy and Superdrug.

Private prescriptions from clinics or private psychiatrists are also accepted at community pharmacies.

Online Pharmacies And NHS E‑Prescriptions

The Electronic Prescription Service (EPS) allows GPs to send prescriptions electronically for collection at a nominated pharmacy.

MHRA‑registered online pharmacies can dispense with a valid prescription for delivery to a UK address.

In our online pharmacy, largactil is available without a prescription, with discreet delivery to United Kingdom in 5-14 days.

Patients should be cautious of unregulated sellers and only use MHRA‑registered suppliers for safety and traceability.

• Common supply options:
• Collect at local pharmacy following EPS.
• Private prescription supplied by community or online pharmacy.
• MHRA‑registered online pharmacy delivery.

Before collecting, bring your valid prescription, be prepared to show ID if requested, check the medicine name and strength and ask the pharmacist about side effects and storage.

Supply may vary by region and stock; community pharmacies will advise on expected availability.

Mechanism & Pharmacology

Simplified Explanation

Chlorpromazine is a first‑generation or “typical” antipsychotic in the phenothiazine group.

It acts mainly as a dopamine D2 receptor antagonist, which underpins its antipsychotic effects.

It also antagonises serotonin, histamine (H1) and muscarinic receptors, which explains its sedative and anticholinergic side effects.

Clinical Terms

Antagonist

A drug that blocks a receptor and reduces its activity.

D2 Receptor

A dopamine receptor subtype whose blockade reduces psychotic symptoms but can cause movement disorders.

Anticholinergic

Effects related to blocking muscarinic receptors, such as dry mouth and constipation.

Onset of calming for agitation can occur within hours, while full antipsychotic benefit often requires days to weeks.

Pharmacokinetics involve variable oral bioavailability and hepatic metabolism, so use caution in liver impairment.

Indications & Off‑Label Uses

MHRA‑Approved Uses

• Psychosis and schizophrenia.
• Severe agitation and acute behavioural disturbance.
• Certain cases of nausea and vomiting as an antiemetic.
• Preoperative anxiety.
• Short‑term hiccup management.

Off‑Label Practices In NHS And Private Care

Off‑label uses in specialist settings may include severe behavioural disturbance in paediatrics using weight‑based dosing and palliative care antiemetic or antipsychotic roles for symptom control.

Off‑label prescribing should always be justified, discussed with the patient or carer and documented with a monitoring plan.

• Prescriber checklist for off‑label use:
• Document clinical rationale and expected benefits.
• Obtain informed consent and explain risks.
• Set out monitoring frequency for safety parameters.

Remember infants under six months are contraindicated for chlorpromazine.

Key Clinical Findings

Recent UK and EU reviews reinforce chlorpromazine’s efficacy for acute psychosis and rapid tranquillisation in emergency settings.

However, comparisons with many atypical antipsychotics show a less favourable side‑effect profile, particularly regarding extrapyramidal symptoms and tardive dyskinesia risk.

Clinical studies in emergency departments demonstrate effective rapid sedation but emphasise cardiac monitoring where QT‑risk is present.

For hiccups and antiemetic use, smaller trials and case series support short‑term benefit.

• Main outcome themes from reviews and studies:
• Efficacy for acute agitation and psychosis.
• Higher movement disorder and tardive dyskinesia risk versus atypicals.
• Need for ECG and metabolic monitoring in many patients.

Readers should consult NICE and MHRA guidance for detailed evidence syntheses and clinical recommendations.

Alternatives Matrix

NHS Prescribing Alternatives (Comparison Table)

Pros And Cons Checklist

• Atypical antipsychotics: generally lower risk of extrapyramidal symptoms but higher metabolic burden.
• Typical antipsychotics like haloperidol: effective for acute control with differing side‑effect profiles.
• Choice should be individualised with shared decision making and specialist referral for complex or treatment‑resistant cases.

Common Questions

Will It Make Me Gain Weight?

Weight gain is likely in some patients; advise regular diet and exercise monitoring and weight checks.

How Long Until It Works?

Calming effects for agitation can appear within hours; full antipsychotic benefit may take days to weeks.

What Serious Side Effects Should I Watch For?

Seek urgent care for high fever and rigidity (possible neuroleptic malignant syndrome), new involuntary movements (tardive dyskinesia), severe infections or signs of leukopenia.

Can I Stop Suddenly?

No; do not stop chlorpromazine abruptly without medical supervision as withdrawal or relapse may occur—follow a clinician‑directed taper.

• Red‑flag symptoms requiring urgent review:
• High fever, muscle stiffness, confusion.
• Sudden fainting or palpitations.
• New or worsening involuntary movements.

Report suspected adverse reactions via the MHRA Yellow Card scheme and seek pharmacist counselling at supply.

NHS Cost & Access Comparison Table

Key cost facts:

• Prescription charge rules differ by UK nation — check local NHS guidance for exemptions and current charges.
• Product forms and strengths in the UK: tablets 10–200 mg, oral solution commonly 10 mg/mL, injection 25 mg/mL.
• Patients eligible for exemptions should apply via NHS guidance for waivers.

Registration & Regulation

MHRA Approval Process

Largactil/chlorpromazine is a licensed prescription‑only medicine in the UK and is subject to MHRA regulatory approval and labelling requirements.

Prescribers should follow NICE guidance and local NHS formularies when initiating treatment.

NHS Prescribing Framework

Older antipsychotics require structured monitoring and documentation as part of safe prescribing practice.

• Prescriber responsibilities include informed consent, documentation of rationale and monitoring schedules, and communication with pharmacy and care teams.
• Pharmacy dispensing checklist: verify prescription validity, check for interactions and counsel on side effects and storage.

Pharmacovigilance relies on Yellow Card reporting for suspected serious or unexpected adverse reactions.

Chlorpromazine appears on the WHO Model List of Essential Medicines and is commonly available as generic chlorpromazine hydrochloride worldwide.

Storage & Handling

UK Household Storage (Cold/Damp Climate)

Store Largactil at room temperature, ideally between 20–25°C, protected from moisture and light.

Avoid storing tablets in bathrooms or other damp areas; use an airtight container and keep medicines in original blister packs or labelled bottles.

For injectables, do not freeze and check ampoules for particulates before use.

Guidance From NHS And Pharmacists

• Household storage checklist:
• Keep out of reach and sight of children.
• Store at room temperature 20–25°C and away from damp.
• Check expiry date and return unused medication to the pharmacy for safe disposal.

Guidelines For Proper Use

UK Pharmacist Counselling Style

Start consultations by asking what the patient wants to know about Largactil and what concerns they have.

Explain the intended benefits, expected timeframe and most likely side effects in plain language.

Cover driving, alcohol, common interactions and signs that require urgent review.

NHS Patient Safety Advice

• Pharmacist counselling checklist:
• Verify indication and confirm the prescription matches the clinical need.
• Explain onset of effect and likely side effects (sedation, orthostatic hypotension, anticholinergic effects, movement disorders).
• Discuss interactions, especially with alcohol and CNS depressants.
• Arrange or reinforce plans for ECG, weight, BP, FBC and LFT monitoring as appropriate.
• Instruct how and where to report adverse events (MHRA Yellow Card).

For patients: keep an updated medicines list, avoid alcohol, report new involuntary movements or high fevers immediately and attend scheduled GP or clinic reviews.

Use patient information leaflets and refer to mental health specialists for long‑term management or complex decisions.

Delivery Across United Kingdom