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Generic name: clozapineKLOE-za-peen ]
Brand names: Clozaril, Versacloz
Drug class: Atypical antipsychotics

Medically reviewed by on Dec 23, 2022. Written by Cerner Multum.

What is Versacloz?

Versacloz is an antipsychotic medicine that is used in adults to treat schizophrenia after other treatments have failed. This medicine is available only from a certified pharmacy under a special program.

Versacloz is also used in adults to reduce the risk of suicidal behavior in people with schizophrenia or similar disorders.

Versacloz may also be used for purposes not listed in this medication guide.

Versacloz side effects

Get emergency medical help if you have signs of an allergic reaction (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).

You may get infections more easily, even serious or fatal infections. Call your doctor right away if you have signs of infection such as:

Further doses may be delayed until your infection clears up.

High doses or long-term use of clozapine can cause a serious movement disorder that may not be reversible. The longer you use Versacloz, the more likely you are to develop this disorder, especially if you are a woman or an older adult.

Versacloz can increase your risk of seizure, especially at high doses. Avoid any activity that could be dangerous if you have a seizure or lose consciousness.

Versacloz may cause serious side effects. Call your doctor at once if you have:

Untreated constipation may lead to serious bowel complications, hospitalization, or death. Tell your doctor right away if you are not having bowel movements at least 3 times per week.

Common side effects of Versacloz may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Versacloz affects your immune system. You may get infections more easily, even serious or fatal infections. Call your doctor if you have a fever, sore throat, weakness, or lack of energy.

Versacloz can increase your risk of seizure, especially at high doses. Avoid any activity that could be dangerous if you have a seizure or lose consciousness.

Versacloz can cause serious heart problems. Call your doctor right away if you have chest pain, trouble breathing, fast or pounding heartbeats or sudden dizziness.

Versacloz is not approved for use in older adults with dementia-related psychosis.

Before taking this medicine

Versacloz may increase the risk of death in older adults with dementia-related psychosis and is not approved for this use.

You should not take Versacloz if you are allergic to Versacloz.

Tell your doctor if you have ever had:

Taking antipsychotic medicine in the last 3 months of pregnancy may cause breathing problems, feeding problems, or withdrawal symptoms in the newborn. However, you may have withdrawal symptoms or other problems if you stop taking your medicine during pregnancy. If you get pregnant, tell your doctor right away. Do not stop taking Versacloz without your doctor's advice.

You should not breastfeed while using Versacloz.

How should I take Versacloz?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

You may take Versacloz with or without food.

Shake the oral suspension (liquid) for 10 seconds before you measure a dose. Measure a dose with the supplied measuring device (not a kitchen spoon).

Remove an orally disintegrating tablet from the package only when you are ready to take the medicine. Place the tablet in your mouth and allow it to dissolve, without chewing. Swallow several times as the tablet dissolves.

Versacloz affects your immune system and can have long lasting effects on your body. You may get infections more easily, even serious or fatal infections. You may need frequent medical tests while using this medicine and for a short time after your last dose.

You should not stop using Versacloz suddenly. Follow your doctor's instructions about tapering your dose.

If you start taking Versacloz again after 2 or more days off the medicine, you may need to use a lower dose than when you stopped. Follow your doctor's dosing instructions very carefully.

Your doctor may recommend you use a laxative while taking Versacloz. Use only the type of laxative your doctor recommends.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

If you miss taking Versacloz for more than 2 days in a row, call your doctor before you start taking it again.

Get your prescription refilled before you run out of medicine completely.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include drowsiness, confusion, fast heartbeats, feeling light-headed, weak or shallow breathing, drooling, choking, or seizure.

What should I avoid while taking Versacloz?

Do not drink alcohol. Dangerous side effects or death could occur.

Avoid coffee, tea, cola, energy drinks or other sources of caffeine.

Avoid driving or hazardous activity until you know how Versacloz will affect you. Dizziness or drowsiness can cause falls, accidents, or severe injuries.

Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.

What other drugs will affect Versacloz?

When you start or stop taking Versacloz, your doctor may need to adjust the doses of any other medicines you take on a regular basis.

Versacloz can cause a serious heart problem. Your risk may be higher if you also use certain other medicines for infections, asthma, heart problems, high blood pressure, depression, mental illness, cancer, malaria, or HIV.

Using Versacloz with other drugs that make you drowsy or slow your breathing can cause dangerous side effects or death. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, cold or allergy medicine, or medicine for anxiety or seizures.

Many drugs can affect Versacloz. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any medicine you start or stop using.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.