What is Fanapt: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Jan 25, 2023

Fanapt overview

BRAND NAMES:

  • Fanapt, Fanapt Titration Pack

Generic Names:

  • Fanapt

Uses:

  • Treats schizophrenia.

Therapeutic Classes:

  • Antipsychotic

Forms:

  • Tablet

How it’s taken:

  • By mouth

What is Fanapt used for?

Fanapt is an atypical antipsychotic used to treat schizophrenia and psychosis. Fanapt works by changing the effects of specific natural chemicals in the brain.

What form(s) does Fanapt come in

  • Tablet

What are common Fanapt doses?

  • Tablet 1mg

  • Tablet 2mg

  • Tablet 4mg

  • Tablet 6mg

  • Tablet 8mg

  • Tablet 10mg

  • Tablet 12mg

Common Fanapt prescriptions

  • Fanapt
    10mg tablet

  • Fanapt
    12mg tablet

  • Fanapt
    1mg tablet

  • Fanapt
    2mg tablet

  • Fanapt
    4mg tablet

  • Fanapt
    6mg tablet

  • Fanapt
    8mg tablet

How to take Fanapt

  • Take your medicine as directed. Your dose may need to be changed several times to find what works best for you.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose. Call your doctor for instructions if you must stop taking the medicine for more than 3 days.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

What to do if you miss a dose of Fanapt

Fanapt contraindications

  • This medicine is not right for everyone. Do not use it if you had an allergic reaction to iloperidone.

Fanapt warnings

  • Tell your doctor if you are pregnant, or if you have liver disease, diabetes, low blood pressure, heart failure, heart rhythm problems (such as prolonged QT interval), breast cancer, high cholesterol, or trouble swallowing. Tell your doctor if you have a history of stroke, heart attack, or seizures.

  • Do not breastfeed while you are using this medicine.

  • This medicine may cause the following problems:Heart rhythm problemsHigh blood sugar or high cholesterol levelsNeuroleptic malignant syndrome (a nerve disorder that can be life-threatening)Tardive dyskinesia (muscle movement you cannot control)Increased levels of prolactin hormoneUnusual mood or behavior

  • This medicine may make you dizzy or drowsy, or may cause trouble with thinking or controlling body movements, which may lead to falls, fractures or other injuries. Do not drive or do anything that could be dangerous until you know how this medicine affects you. You may also feel lightheaded when getting up suddenly from a lying or sitting position, so stand up slowly.

  • This medicine lowers the number of white blood cells. This weakens your immune system, so you may get infections more easily. Wash your hands often. Avoid people who are sick.

  • This medicine may change how your body regulates temperature. Avoid activities that could cause you to become very cold, hot, or dehydrated.

  • Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

  • Seizure

Fanapt interactions

  • Some medicines can affect how iloperidone works. Tell your doctor if you are using any of the following:Chlorpromazine, clarithromycin, fluoxetine, gatifloxacin, itraconazole, ketoconazole, levomethadyl acetate, methadone, moxifloxacin, paroxetine, pentamidine, thioridazineBlood pressure medicineMedicine to treat heart rhythm problems (including amiodarone, procainamide, quinidine, sotalol)

  • Tell your doctor if you use anything else that makes you sleepy. Some examples are allergy medicine, narcotic pain medicine, and alcohol.

  • Do not drink alcohol while you are using this medicine.

  • This medicine lowers the number of white blood cells. This weakens your immune system, so you may get infections more easily. Wash your hands often. Avoid people who are sick.

  • This medicine may cause you to overheat. Drink plenty of water during hot weather or when exercising. Avoid hot tubs and saunas.

  • Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Fanapt side effects

Serious Side Effects

  • Lightheadedness, dizziness, fainting

  • Seizure

  • Jerky muscle movement you cannot control (often in your face, tongue, or jaw)

  • Mood or behavior changes, or thoughts of hurting yourself or others

  • Increased hunger or thirst, urinating more often than usual

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Fast, pounding, uneven heartbeat

  • Fever, sweating, confusion, muscle stiffness

Less Serious Side Effects

  • Diarrhea, nausea

  • Sleepiness, tiredness

  • Dry mouth

  • Weight gain