Fanapt (iloperidone) is a prescription oral tablet used to treat schizophrenia in adults. It’s usually taken twice per day.
This article describes the dosages of Fanapt, as well as its strengths and how to take it. To learn more about Fanapt, see this in-depth article.
The table below highlights the basics of Fanapt’s dosage. All dosages are listed in milligrams (mg).
|1 mg twice daily
|2 mg twice daily
|4 mg twice daily
|6 mg twice daily
|8 mg twice daily
|10 mg twice daily
|Days 7 and beyond*
|12 mg twice daily
* The usual target dosage is 6–12 mg twice per day (a total of 12–24 mg daily). The maximum recommended daily dosage based on studies is 24 mg per day.
Note: The chart above shows an example of how your doctor may gradually increase your dose over time. However, they’ll instruct you on exactly how your dose should be increased to reach your maintenance (ongoing) dose.
Keep reading for more details about Fanapt’s dosage.
What is Fanapt’s form?
Fanapt comes as an oral tablet.
What strengths does Fanapt come in?
Fanapt is available in seven strengths:
- 1 mg
- 2 mg
- 4 mg
- 6 mg
- 8 mg
- 10 mg
- 12 mg
What are the usual dosages of Fanapt?
Your doctor will likely start you on a low dose of Fanapt and adjust it over time to reach the right amount for you. They’ll ultimately prescribe the smallest dosage that provides the desired effect.
The information below describes dosages that are commonly used or recommended. But be sure to take the dosage your doctor prescribes. They’ll determine the best dosage to fit your needs.
Dosage for schizophrenia
The typical Fanapt dosage for adults with schizophrenia is 6–12 mg taken twice per day (a total of 12–24 mg daily). The maximum recommended dosage of Fanapt is 24 mg per day.
To reach this dosage, your doctor will likely prescribe a lower dose and gradually increase it over time. This is to reduce the risk of side effects. (See the chart at the beginning of this section for an example of how this dosage increase might look.)
Per the drug’s prescribing information, there should be no more than a 2-mg increase per dose (4 mg per day).
Is Fanapt used long term?
Yes, Fanapt is usually a long-term treatment. If you and your doctor determine that it’s safe and effective for your condition, you’ll likely take it long term.
Certain drugs may affect how Fanapt is broken down in your body. These include drugs that:
- slow down the CYP2D6 enzyme*, such as
- slow down the CYP3A4 enzyme*, such as
If you take any of these medications, your doctor will likely recommend a reduced dose of Fanapt.
They may also suggest a reduced dose if you have moderate liver problems or your body is slow at breaking down drugs using the CYP2D6 enzyme.*
* Cytochrome P450 2D6 (CYP2D6) and cytochrome P450 3A4 (CYP3A4) are enzymes in the liver that help break down certain drugs, including Fanapt.
The dosage of Fanapt you’re prescribed may depend on several factors. These include:
- the severity of the condition you’re taking the drug to treat
- your age
- other conditions you may have (see the “Dosage adjustments” section above)
- other medications you take
If you have certain conditions, your doctor may recommend you not take Fanapt. These include:
- severe liver problems
- heart rhythm problems, including long QT syndrome
- certain types of heart failure or recent heart attack
Your doctor may recommend that you stop taking Fanapt if you develop certain conditions during treatment. These include:
- neuroleptic malignant syndrome, which may cause high fever or rapid heart rate
- tardive dyskinesia, which can cause unmanageable movements in various areas of your body
- low levels of white blood cells, especially if you had the condition before starting Fanapt
Fanapt may also cause or worsen other conditions, such as:
- type 2 diabetes
- high cholesterol
- high triglycerides
- high levels of prolactin in your blood
- obesity (Fanapt may cause weight gain)
- difficulty swallowing
- dizziness when standing up
- fainting or passing out
- prone to falling
Fanapt may also cause an impaired sense of judgment and coordination. You should not drive or operate machinery until you know how this drug will affect you.
Fanapt comes as an oral tablet. If you have trouble swallowing tablets, see this article for tips on how to take this form of medication.
You can take Fanapt with or without food any time of day. However, it’s best to take your doses at the same times of day every day. This helps keep a level amount of the drug in your body.
For information on the expiration, storage, and disposal of Fanapt, talk with your doctor or pharmacist.
Accessible drug containers and labels
Some pharmacies provide medication labels that:
- have large print
- use braille
- feature a code you can scan with a smartphone to change the text to audio
Your doctor or pharmacist may be able to recommend pharmacies that offer these accessibility features if your current pharmacy doesn’t.
Let your pharmacist know if you have trouble opening medication bottles. They may have tips to help, or they may be able to supply Fanapt in an easy-open container.
If you miss a dose of Fanapt, take it as soon as you remember. But if it’s almost time for your next dose, skip the missed dose and take your next dose at its usual time.
If you’ve missed your Fanapt doses for more than 3 days in a row, contact your doctor. They’ll likely recommend a lower dose that will be gradually increased over time to return you to your usual dose.
If you’re not sure whether you should take a missed dose, talk with your doctor or pharmacist.
If you need help remembering to take your dose of Fanapt on time, try using a medication reminder. This can include setting an alarm or downloading a reminder app on your phone.
Do not take more Fanapt than your doctor prescribes, as this can lead to harmful effects.
Symptoms of overdose
Symptoms caused by an overdose can include:
What to do in case you take too much Fanapt
Call your doctor right away if you think you’ve taken too much Fanapt. You can also call 800-222-1222 to reach America’s Poison Centers or use its online resource. But if you have severe symptoms, immediately call 911 (or your local emergency number) or go to the nearest emergency room.
Below are answers to some commonly asked questions about Fanapt’s dosage.
Is Fanapt’s dosage similar to that of Risperdal?
Fanapt and Risperdal (risperidone) both come as oral tablets. Risperdal also comes as a liquid solution.
Fanapt is taken twice per day. Risperdal can be taken once or twice per day. Both drugs can be taken with or without food.
The dose in milligrams for each drug differs. Your doctor will prescribe the drug and the dosage that’s right for you.
To learn more about how these drugs compare, talk with your doctor.
How long does it take for Fanapt to start working?
Fanapt starts to work after your first dose. But your doctor will likely instruct you to start taking a lower dose and gradually increase it over time. This may help reduce your risk of side effects.
It may take several days to reach your prescribed dose. So you could take Fanapt for a few weeks before you notice changes in your symptoms. But your doctor will monitor you during treatment to be sure the drug is working to manage your condition.
If you have other questions about what to expect from Fanapt treatment, talk with your doctor.
The sections above describe the usual dosages provided by the manufacturer of Fanapt. If your doctor recommends this drug, they’ll prescribe the dosage that’s right for you.
Remember, you should not change your dosage of Fanapt without your doctor’s recommendation. Only take this drug exactly as prescribed. Talk with your doctor if you have questions or concerns about your current dosage. Examples of questions you may want to ask include:
- Will taking a lower dose of Fanapt mean I gain less weight?
- If I develop type 2 diabetes or high cholesterol while taking Fanapt, should my dose be reduced?
- Once I feel my symptoms are well managed, can I try a lower dose?
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Disclaimer: Healthline has made every effort to make certain that all information is factually correct, comprehensive, and up to date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or another healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.