Pimavanserin - oral
Pimavanserin - oral
There may be a slightly increased risk of serious, possibly fatal side effects (such as stroke, heart failure, fast/irregular heartbeat, pneumonia) when this medication is used by older adults with dementia. This medication should only be used to treat a certain mental/mood disorder (psychosis) due to Parkinson's disease. Talk with the doctor about the risks and benefits of treatment with this medication.
Pimavanserin is used to treat the symptoms of a certain mental/mood disorder (psychosis) that might occur with Parkinson's disease. It helps lessen symptoms such as seeing or hearing things that are not there (hallucinations) and false beliefs (delusions). Pimavanserin belongs to a class of drugs known as atypical antipsychotics, though it works differently from most other drugs in this class.
Take this medication by mouth with or without food as directed by your doctor, usually once daily.
Take this medication regularly to get the most benefit from it. To help you remember, take it at the same time each day.
The dosage is based on other medications you may be taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Tell your doctor if your condition gets worse.
Swelling ankles/feet/hands, confusion, or nausea may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Get medical help right away if you have any very serious side effects, including:
In the US -
Before taking pimavanserin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of:
Pimavanserin may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can rarely cause serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that need medical attention right away.
The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Before using pimavanserin, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions:
Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting.
Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Older adults may be more sensitive to the side effects of this drug, especially QT prolongation (see above).
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.
Many drugs besides pimavanserin may affect the heart rhythm (QT prolongation), including amiodarone, chlorpromazine, disopyramide, moxifloxacin, procainamide, quinidine, sotalol, thioridazine, ziprasidone, among others.
Other medications can affect the removal of pimavanserin from your body, which may affect how pimavanserin works. Examples include efavirenz, rifamycins (such as rifampin/rifabutin), St. John's wort, drugs used to treat seizures (such as carbamazepine, phenytoin), among others.
If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.
Do not share this medication with others.
If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.
Information last revised May 2019.
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