An antipsychotic (tablets and depot)

Zuclopenthixol

An older antipsychotic for schizophrenia, available as tablets and as a long-acting depot injection.

What is Zuclopenthixol?

Zuclopenthixol is a first-generation (typical) antipsychotic used for schizophrenia and other psychotic illnesses. It comes as tablets and also as a long-acting depot injection given into a muscle, which slowly releases the medicine so it does not have to be taken every day. Like other older antipsychotics it can cause movement side effects and sedation.

Class: Antipsychotics · Brands: Clopixol

Education and reference only. This is a plain-language guide to Zuclopenthixol — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.

Written by Meds Global Health Clinical Team · Clinically reviewed by Dr Muhammad Suffyan, MB BS, Founder & Clinical Director · Last reviewed · How we review
Class: Antipsychotics → Brands: Clopixol
Zuclopenthixol (Antipsychotics) — Meds Global Health reference card with 2D molecular structure
Zuclopenthixol — Antipsychotics. The image shows the active ingredient's 2D molecular structure.

What it is

Zuclopenthixol is an older, first-generation antipsychotic. It is used to treat schizophrenia and similar conditions, including when ongoing agitation or aggression is a problem. A key feature is that it is available as a depot: a long-acting injection given into a muscle every few weeks, which can help people who find daily tablets difficult.

How it works

Zuclopenthixol mainly blocks dopamine receptors in the brain, reducing the overactive dopamine signalling thought to drive psychotic symptoms such as hallucinations and delusions. The depot injection forms a slow-release store in the muscle, so the medicine is released steadily between appointments rather than taken daily.

Company & origin

Originated / developed by: Branded as Clopixol; also available as generic preparations in the UK..

Zuclopenthixol is a first-generation antipsychotic of the thioxanthene group, available both as tablets and as a long-acting depot injection.

What it treats

Conditions Zuclopenthixol is used for

Schizophrenia & psychosisA serious mental illness where a person loses some contact with reality — treated with ant…

Practical use

How to take Zuclopenthixol

General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.

  • Tablets are taken by mouth as directed; the depot is given by a nurse as an injection into a muscle (often the buttock) at planned intervals.
  • Take or attend for your medicine regularly, even when you feel well, to keep symptoms controlled.
  • Do not stop the tablets suddenly, as this can cause withdrawal effects or a relapse.
  • Keep your depot injection appointments; tell your team if you cannot attend.
  • Avoid alcohol, which adds to drowsiness, and take care with driving until you know how it affects you.

Weighing it up

Advantages & disadvantages of Zuclopenthixol

Advantages

  • Effective for schizophrenia, including agitation and aggression.
  • The depot injection avoids the need to remember daily tablets and gives a steady effect.
  • Tablet and depot options allow treatment to be tailored to the person.

Disadvantages

  • More likely than newer antipsychotics to cause movement side effects such as stiffness, tremor and restlessness.
  • Sedating, which can affect daytime alertness and driving.
  • With the depot, side effects cannot be removed quickly because the medicine lingers after the injection.

Practical use

Good to know

Zuclopenthixol can be given as tablets or as a depot injection; the depot helps maintain a steady effect without daily tablets. It is sedating and can cause movement side effects. Do not stop the tablets suddenly. With the depot, the effect continues for some time after the last injection. Seek urgent help (999 or A&E) if you develop a high temperature with severe muscle stiffness, confusion and a fast heartbeat — this can signal a rare but serious reaction called neuroleptic malignant syndrome.

Who should not take it / use with caution

  • People with a known allergy to zuclopenthixol or related thioxanthenes.
  • People who are very drowsy or have a reduced level of consciousness.
  • Used with caution in heart disease, Parkinson's disease, epilepsy, glaucoma and prostate problems, and in older people.

Monitoring

  • Regular review of symptoms and side effects, especially movement effects.
  • Blood pressure, weight and, where appropriate, blood sugar and cholesterol.
  • An ECG may be checked in some people; the depot site is reviewed at each injection.

Side effects

  • Drowsiness, especially at first.
  • Movement effects (extrapyramidal symptoms): stiffness, tremor, slowed movements and restlessness.
  • Dizziness on standing due to lower blood pressure (postural hypotension).
  • Dry mouth, blurred vision, constipation and weight gain.
  • Raised prolactin, causing breast tenderness, milk production or period changes.
  • Soreness at the injection site with the depot; rarely, effects on heart rhythm (QT prolongation).

Key interactions

  • Alcohol and other sedating medicines increase drowsiness.
  • Medicines that affect heart rhythm may add to the risk of QT problems.
  • Blood-pressure-lowering medicines can worsen dizziness on standing.
  • Tell your team about all medicines, including those bought over the counter.

Available as: Tablets and a long-acting depot injection.

Answers

Zuclopenthixol: frequently asked questions

What is a depot injection?

A depot is a long-acting injection given into a muscle. It releases the medicine slowly over days to weeks, so you do not need daily tablets. A nurse gives it at planned appointments.

Can I stop zuclopenthixol when I feel well?

Do not stop the tablets suddenly, as this can cause withdrawal or a relapse. With the depot, the effect continues for some time after the last injection. Any change should be planned with your team.

Why might the depot be offered to me?

The depot can help if daily tablets are hard to remember or if a steady level of medicine is wanted. It is a shared decision between you and your team.

What is neuroleptic malignant syndrome?

It is a rare but serious reaction to antipsychotics. Warning signs include high temperature, severe muscle stiffness, confusion, a fast or irregular heartbeat and sweating. This is a medical emergency: seek urgent help (call 999 or go to A&E) straight away.

Will it cause movement problems?

Older antipsychotics like zuclopenthixol can cause stiffness, tremor or restlessness. Tell your team about any such symptoms, as the dose can be adjusted or other medicines added to help.

The wider class

About Antipsychotics

Zuclopenthixol belongs to the antipsychotics class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.

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Mental healthConditions and medicines for mood, anxiety, psychosis, sleep and dependence — used alongsi…

Authoritative sources

  • BNF: Zuclopenthixol.
  • NICE CKS: Antipsychotics.

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