Clozapina
Clozaril, Denzapine, Zaponex
Revisione paritaria di Sid DajaniUltimo aggiornamento di Michael Stewart, MRPharmSUltimo aggiornamento 7 Ago 2023
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Clozapine is prescribed for mental health problems which affect the way you think, feel or behave.
It is important that you have regular check-ups and blood tests.
Make sure you read all the printed information you are given. If there is anything you are unsure about, ask your doctor or clinic for further advice.
A colpo d'occhio
Clozapine is an antipsychotic medicine prescribed for schizophrenia and psychosis in Parkinson's disease.
A specialist doctor will prescribe and closely monitor your progress with clozapine.
You will need regular blood tests and monitoring appointments while taking this medicine.
Do not drink alcohol, and tell your doctor if you start or stop smoking.
If you miss more than two days of doses, contact your clinic for advice.
Report symptoms like muscle stiffness, high temperature, or confusion to your doctor immediately.
About clozapine
Tipo di medicinale | Un medicinale antipsicotico |
Utilizzato per | Schizophrenia; psychosis in people with Parkinson's disease |
Chiamato anche | Clozaril®; Denzapine®; Zaponex® |
Disponibile come | Tablets, oral liquid medicine and melt-in-the-mouth (orodispersible) tablets |
Clozapine belongs to a group of medicines called antipsicotici. These medicines work on the balance of chemical substances in the brain. You will be prescribed clozapine by a specialist doctor who will keep a thorough and close check on your progress.
Clozapine is prescribed to relieve the symptoms of psychosis. This is the name used by doctors to describe a disordered state of mind. Clozapine is prescribed in particular for people with schizofrenia. Schizophrenia is a mental health problem that causes disordered ideas, beliefs and experiences. People with schizophrenia can have difficulty knowing which thoughts and experiences are true and real and which are not. Similar symptoms to these can also sometimes occur in people who have Malattia di Parkinson.
Before taking clozapine
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking clozapine it is important that your doctor knows:
Se sei incinta o stai allattando.
Se hai una malattia cardiaca o dei vasi sanguigni.
Se hai problemi al fegato, ai reni o alla prostata.
Se hai problemi respiratori.
If you have had any surgery on your bowels, or if you have any bowel problems (including severe constipation).
If you have any of the following: epilepsy, depression, raised pressure in your eye (glaucoma) or myasthenia gravis, a condition which causes muscle weakness.
Se hai mai avuto ingiallimento della pelle o del bianco degli occhi (ittero) o un disturbo del sangue.
Se hai un tumore sulla ghiandola surrenale, una condizione chiamata feocromocitoma.
Se hai avuto una reazione allergica a un medicinale.
Se stai assumendo o utilizzando altri medicinali. Questo include qualsiasi medicinale che stai assumendo e che è disponibile per l'acquisto senza prescrizione, così come i medicinali a base di erbe e complementari.
How to take clozapine
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack and the additional information you have been given by your doctor or clinic. These will provide you with more information about clozapine and will include a full list of the side-effects which you may experience from taking it.
Your dose will be individually adjusted to control your symptoms, so take clozapine exactly as your doctor tells you to. Try to get into the habit of taking your doses at the same times of day as this will help you avoid missing any. Clozapine is not affected by food in your stomach so you can take your doses either before or after meals.
Many people find it helps to swallow the tablet with a drink of water. If you have any difficulties swallowing, let your doctor know about this so that you can be prescribed liquid medicine or melt-in-the-mouth tablets instead.
If you have been given liquid medicine, make sure you understand how to use the dose syringes (dispensers) to measure out your doses. If you are unsure about this, you can ask your clinic or pharmacist to show you what to do. You can mix your dose into a small glass of water if you like, but do not mix it with any other drinks.
After you receive a new bottle of liquid medicine from the pharmacy you should shake the bottle vigorously for 90 seconds to ensure the medicine is properly mixed. Then, if possible, leave the bottle to stand for 24 hours before using it. You should also gently shake the bottle for ten seconds before every dose.
If you have been given an orodispersible tablet, these are made to dissolve in your mouth before swallowing. Remove the tablet carefully from the blister and place it on your tongue. It will dissolve quickly but it may help to have a drink of water first so that your mouth is moist. Make sure your hands are dry before touching the tablet.
If you forget to take a dose, take it as soon as you remember unless your next dose is due. If it is nearly time for your next dose, take the next dose when it is due but leave out the forgotten dose. Do not take two doses together to make up for a missed dose. If you miss taking clozapine for more than two days, speak with your clinic for advice, as your dose may need adjusting for a short while.
Ottenere il massimo dal tuo trattamento
You will need to register with a monitoring service, which will make sure it is safe for you to keep taking clozapine. You will be told how to do this by your clinic.
Remember to keep your regular doctor's appointments so that your progress can be checked. It is important that you have regular blood tests while you are being treated with clozapine.
Drinking alcohol will increase the chance that you experience side-effects so should be avoided.
If you are having an operation, tell the person carrying out the treatment which medicines you are taking. This is important because clozapine may interfere with any anaesthetic you receive.
If you buy or take any 'over-the-counter' medicines, check with a pharmacist that they are suitable to take with clozapine.
If you have diabetes you may need to check your blood sugar (glucose) more frequently, as clozapine can affect the levels of sugar in your blood. Your doctor will advise you about this.
Smoking may affect the amount of clozapine in your body. Let your doctor know if you start or stop smoking while taking clozapine.
Treatment with clozapine is long-term and it is important that you continue to take it for as long as your doctor tells you to. Do not change your dose or stop treatment suddenly as this can cause problems. If a change in your treatment becomes necessary, your doctor will want you to reduce your dose gradually over a week or so.
Can clozapine cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. Your doctor will discuss the risks of the treatment with you before you start taking clozapine. In particular, clozapine can cause heart problems and blood disorders. You will be given regular check-up appointments so that your doctor can monitor you for any evidence of these.
The table below contains some of the most common unwanted effects associated with clozapine. You will find a full list in the manufacturer's information leaflet supplied with your medicine.
Common clozapine side-effects | Cosa posso fare se sperimento questo? |
Feeling sleepy, blurred vision | Non guidare e non utilizzare strumenti o macchinari. Non bere alcolici |
Costipazione | Let your doctor know straightaway |
Feeling faint or dizzy, especially when you sit up or stand up | Getting up or moving more slowly may help |
Extreme tiredness, feeling short of breath, the sensation of having a 'thumping' heart (palpitations), fast heartbeat | Let your doctor know straightaway |
Mal di testa | Bevi molta acqua e chiedi al tuo farmacista di consigliarti un antidolorifico adatto. Se i mal di testa persistono, informa il tuo medico |
Sensazione di nausea | Attieniti a cibi semplici - evita pasti ricchi o piccanti |
Sensazione di tremore o irrequietezza, movimenti muscolari insoliti o incontrollabili | Parla con il tuo medico il prima possibile riguardo a uno di questi. Il tuo trattamento potrebbe necessitare di aggiustamenti |
Increased weight, dry mouth, lack of appetite, increased amounts of saliva, feeling hot or sweaty, problems passing urine | Discuti questi con il tuo medico se qualcuno diventa problematico |
Changes to blood tests and ECG tests | Il tuo medico controllerà regolarmente questi aspetti |
Importante: if you experience symptoms such as muscle stiffness, a very high temperature, feeling confused, a fast heartbeat and sweating, you should contact your doctor immediately. These can be signs of a rare but serious condition known as neuroleptic malignant syndrome.
Se si verificano altri sintomi che ritieni possano essere dovuti al medicinale, parla con il tuo medico o farmacista per ulteriori consigli.
How to store clozapine
Tenere tutti i medicinali fuori dalla portata e dalla vista dei bambini.
Conservare in un luogo fresco e asciutto, lontano da fonti di calore e luce diretta.
Informazioni importanti su tutti i medicinali
Informazioni importanti su tutti i medicinali
Non assumere mai più della dose prescritta. Se sospetti che tu o qualcun altro possa aver assunto un sovradosaggio di questo medicinale, recati al pronto soccorso del tuo ospedale locale. Porta con te il contenitore, anche se è vuoto.
Questo medicinale è per te. Non darlo mai ad altre persone, anche se la loro condizione sembra essere la stessa della tua.
Non conservare medicinali scaduti o indesiderati. Portali alla tua farmacia locale che li smaltirà per te.
Se hai domande su questo medicinale, chiedi al tuo farmacista.
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Domande frequenti
What is psychosis, and how does clozapine help with it?
Psychosis is a medical term for a disordered state of mind. It can manifest as disordered ideas, beliefs, and experiences, making it difficult to distinguish reality. Clozapine works by affecting the balance of chemical substances in the brain to help relieve these symptoms.
Why is clozapine prescribed specifically for people with schizophrenia or Parkinson's disease, and not other conditions?
Clozapine is specifically prescribed for schizophrenia, a mental health problem characterised by disordered thoughts and experiences. Similar psychotic symptoms can also occur in people with Parkinson's disease, for which clozapine is also used to help manage these symptoms.
What should I do if I miss more than two days of my clozapine medication?
If you miss taking clozapine for more than two days, you should contact your clinic for advice. Your dose may need to be adjusted for a short period to safely restart your treatment.
Does clozapine interact with other medicines, including over-the-counter or herbal remedies?
Yes, clozapine can interact with other medicines. It's important to inform your doctor about all medicines you are taking, including those bought without a prescription, as well as herbal and complementary medicines. Also, if you buy any over-the-counter medicines, check with a pharmacist to ensure they are suitable to take with clozapine.
What are the signs of a rare but serious condition called neuroleptic malignant syndrome?
If you experience symptoms such as muscle stiffness, a very high temperature, feeling confused, a fast heartbeat, and sweating, these could be signs of neuroleptic malignant syndrome. You should contact your doctor immediately if you notice these symptoms.
Ulteriori letture e riferimenti
- Manufacturer's PIL, Clozaril® 25 mg and 100 mg tablets; Mylan Products Ltd, The electronic Medicines Compendium. Dated June 2019.
- Manufacturer's PIL, Denzapine® 50 mg/ml Oral Suspension; Britannia Pharmaceuticals Limited, The electronic Medicines Compendium. Dated February 2019.
- Manufacturer's PIL, Zaponex® 12.5 mg, 25 mg, 50 mg, 100 mg and 200 mg orodispersible tablets; Leyden Delta BV, The electronic Medicines Compendium. Dated July 2020.
- Medicinali Completi BNF 89ª Edizione; Associazione Medica Britannica e Società Farmaceutica Reale di Gran Bretagna, Londra.
Informazioni sull'autoreVisualizza il profilo completo

Michael Stewart, MRPharmS
Responsabile Revisione Foglietti Illustrativi – Contrattista, Farmacista
BPharm (Hons), MRPharmS
Michael è un farmacista comunitario che esercita nelle Midlands e nel South Yorkshire con oltre 20 anni di esperienza nel consigliare su farmaci e condizioni mediche. Ha una solida esperienza nella formazione sanitaria, avendo prodotto e tenuto corsi di formazione per team di farmacia e personale di strutture di assistenza residenziale, inclusi infermieri. Ha anche contribuito a consigli consultivi farmaceutici per la gestione di condizioni a bassa gravità nella comunità.
Informazioni sul recensore

Sid Dajani
Sultan Dajani si è laureato alla London School of Pharmacy nel 1994 ed è diventato il più giovane membro eletto del consiglio della Royal Pharmaceutical Society dalla sua fondazione nel 1842.
Storia dell'articolo
Le informazioni su questa pagina sono scritte e revisionate da clinici qualificati.
Articolo disponibile anche in Inglese, Tedesco, Spagnolo, Francese, Italiano, Portoghese, Hindi, Ebraico, Arabo, and Svedese.
Prossima revisione prevista: 6 ago 2026
7 Ago 2023 | Ultima versione

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