Studies have shown that older adults with dementia (a brain disorder that affects the ability to remember, think clearly, communicate, and perform daily activities and may cause changes in mood and personality) who take antipsychotics (medications for mental illness) have an increased risk of death during treatment. Pimavanserin is not approved for the treatment of people with dementia-related psychosis that are not related to the hallucinations and delusions from Parkinson's disease psychosis.
Why is this medication prescribed?
Pimavanserin is used to treat hallucinations and delusions in people with psychosis from Parkinson's disease (PD; a disorder of the nervous system that causes difficulties with movement, muscle control, and balance). Pimavanserin is in a class of medications called atypical antipsychotics. It works by changing the activity of certain natural substances in the brain.
How should this medicine be used?
Pimavanserin comes as a tablet to take by mouth. It is usually taken once daily with or without food. Take pimavanserin at around the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take pimavanserin exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Other uses for this medicine
This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.
What special precautions should I follow?
Before taking pimavanserin,
- tell your doctor and pharmacist if you are allergic to pimavanserin, any other medications, or any of the ingredients in pimavanserin tablets. Ask your pharmacist for a list of the ingredients.
- tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: carbamazepine (Carbatrol, Tegretol, Teril, others); chlorpromazine; clarithromycin (Biaxin, in Prevpac); gatifloxacin; indinavir (Crixivan); itraconazole (Onmel, Sporanox); ketoconazole (Nizoral); certain medications for irregular heartbeat including amiodarone (Cordarone, Nexterone, Pacerone), disopyramide (Norpace), procainamide, quinidine (in Nuedexta), and sotalol (Betapace, Sorine, Sotylize); moxifloxacin (Avelox); phenytoin (Dilantin, Phenytek); rifampin (Rifadin, Rimactane, in Rifamate, in Rifater); thioridazine; or ziprasidone (Geodon). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with pimavanserin, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
- tell your doctor what herbal products you are taking, especially St. John's wort.
- tell your doctor if you have or have ever had QT prolongation (an irregular heart rhythm that can lead to fainting, loss of consciousness, seizures, or sudden death); an irregular heartbeat; low levels of potassium or magnesium in your blood; or kidney or liver disease.
- tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking pimavanserin, call your doctor.
What special dietary instructions should I follow?
Unless your doctor tells you otherwise, continue your normal diet.
What should I do if I forget a dose?
Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.
What side effects can this medication cause?
Pimavanserin may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
- swelling of hands, ankles, or feet
Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately:
- hallucinations (seeing things or hearing voices that do not exist)
- difficulty walking normally
Pimavanserin may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.
If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (http://www.fda.gov/Safety/MedWatch) or by phone (1-800-332-1088).
What should I know about storage and disposal of this medication?
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom).
Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. Talk to your pharmacist or contact your local garbage/recycling department to learn about take-back programs in your community. See the FDA's Safe Disposal of Medicines website (http://goo.gl/c4Rm4p) for more information if you do not have access to a take-back program.
In case of emergency/overdose
In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.
What other information should I know?
Keep all appointments with your doctor.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.
It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.