Skip to main content


Generic name: iloperidone [ EYE-loe-PER-i-done ]
Brand name: Fanapt
Dosage form: oral tablet (1 mg; 1 mg-2 mg-4 mg-6 mg; 10 mg; 12 mg; 2 mg; 4 mg; 6 mg; 8 mg)
Drug class: Atypical antipsychotics

Medically reviewed by on Jan 26, 2024. Written by Cerner Multum.

What is iloperidone?

Iloperidone is an antipsychotic medication that is used to treat schizophrenia in adults.

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

Iloperidone side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

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

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

Older adults may be more likely to have side effects from iloperidone.

Common side effects of iloperidone 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.


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

Before taking this medicine

You should not use iloperidone if you are allergic to it.

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

Tell your doctor if you have ever had:

If you are pregnant, your name may be listed on a pregnancy registry to track the effects of iloperidone on the baby.

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

You should not breastfeed while you are taking iloperidone.

Iloperidone is not approved for use by anyone younger than 18 years old.

How should I take iloperidone?

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.

It may take up to 2 weeks before your symptoms improve. Keep using the medication as directed and tell your doctor if your symptoms do not improve.

Your doctor will need to check your progress on a regular basis.

If you have stopped taking iloperidone for more than 3 days in a row, talk with your doctor before you start taking it again. You may need to restart the medicine at a lower dose.

Store at room temperature away from moisture, heat, and light.

Iloperidone dosing information

Usual Adult Dose for Schizophrenia:

Initial dose: 1 mg orally twice a day
Maintenance dose: 6 to 12 mg twice a day
Maximum dose: 24 mg/day

-This drug must be titrated slowly to avoid orthostatic hypotension.
-Control of symptoms may be delayed during the first 1 to 2 weeks of treatment because of the need to titrate slowly.
-Treatment should be increased in increments of not more than 2 mg twice daily as tolerated.
-Healthcare providers should periodically re-evaluate the long-term risks and benefits of the drug for the individual patient.

Use: Treatment of schizophrenia

What happens if I miss a dose?

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

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

What should I avoid while taking iloperidone?

Avoid driving or hazardous activity until you know how iloperidone will affect you. Your reactions could be impaired.

Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Dizziness or severe drowsiness can cause falls, fractures, or other injuries.

While you are taking iloperidone, you may be more sensitive to very hot conditions. Avoid becoming overheated or dehydrated. Drink plenty of fluids, especially in hot weather and during exercise.

Drinking alcohol with this medicine can cause side effects.

What other drugs will affect iloperidone?

Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.

Iloperidone 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 iloperidone with other drugs that make you drowsy can worsen this effect. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.

Many drugs can affect iloperidone. 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.