Class Name(s):

• 28:16.08.04 Atypical Antipsychotics

Pronunciation:

• (ris per' i done)

Brand Name(s):

• Perseris^®
• Risperdal Consta^®
• Risvan^®Â¶
• Rykindo^®
• Uzedy^®

IMPORTANT WARNING:

Older adults with dementia (loss of memory and brain function) may have an increased risk of death if treated with antipsychotic medications such as risperidone injection. Older adults with dementia may also have a greater chance of having a stroke or mini stroke during treatment.

Risperidone injection is not approved by the Food and Drug Administration (FDA) for the treatment of behavior problems in older adults with dementia. Talk to the doctor who prescribed this medication if you, a family member, or someone you care for has dementia and is taking or receiving risperidone.

Talk to your doctor about the risks of receiving risperidone injection.

WHY is this medicine prescribed?

Risperidone injection is used to treat schizophrenia (a mental illness that causes disturbed or unusual thinking, loss of interest in life, and strong or inappropriate emotions) and bipolar I disorder (a disease that causes episodes of depression, episodes of severe mania, and other abnormal moods). Risperidone 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?

Risperidone extended-release (long-acting) injection comes as a powder to be mixed with a liquid and a suspension (liquid) to be injected intramuscularly (into a muscle) into the arm or buttocks or subcutaneously (under the skin) into the arm or abdomen by a healthcare provider. You will receive an injection every 2 weeks to 2 months, depending on the product given. If you have never received risperidone extended-release injection previously, your doctor will probably tell you to take risperidone tablets or oral solution by mouth before you receive your first injection.

Risperidone extended-release injection may help control your symptoms but will not cure your condition. Continue to keep appointments to receive risperidone injection even if you feel well. Talk to your doctor if you do not feel like you are getting better during your treatment with risperidone injection.

Are there OTHER USES for this medication?

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

What SPECIAL PRECAUTIONS should I follow?

Before receiving risperidone injection,

• tell your doctor or pharmacist if you are allergic to this drug, any part of this drug, or any other drugs, foods or substances. Tell your doctor or pharmacist about the allergy and what symptoms you had..
• tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
• the following nonprescription or herbal products may interact with risperidone: cimetidine, ranitidine, and St. John's Wort. Be sure to let your doctor and pharmacist know that you are taking these medications before you start receiving risperidone injection. Do not start these medications while receiving risperidone injection without discussing with your healthcare provider.
• tell your doctor if you have a low number of white blood cells or if any other medication has ever caused a decrease in your white blood cells. Also tell your doctor if you have had or have ever had a stroke, a ministroke, heart disease, a heart attack, heart failure, irregular heartbeat, high cholesterol levels, seizures, difficulty swallowing, trouble keeping your balance, Parkinson's disease (PD; a disorder of the nervous system that causes difficulties with movement, muscle control, and balance), osteoporosis, or kidney or liver disease. Tell your doctor if you or anyone in your family has or has ever had diabetes and if you have severe vomiting, diarrhea or signs of dehydration now, or if you develop these symptoms at any time during your treatment.
• tell your doctor if you are pregnant, if you plan to become pregnant, or are breastfeeding. If you become pregnant while receiving risperidone injection, call your doctor. Risperidone may cause problems in newborns following delivery if it is taken during the last months of pregnancy.
• you should know that receiving risperidone injection may make you drowsy and may affect your ability to think clearly, make decisions, and react quickly. Do not drive a car or operate machinery during your treatment with risperidone injection until you know how this medication affects you.
• you should know that alcohol can add to the drowsiness caused by this medication. Do not drink alcohol during your treatment with risperidone injection.
• you should know that you may experience hyperglycemia (increases in your blood sugar) while you are receiving this medication, even if you do not already have diabetes. If you have schizophrenia, you are more likely to develop diabetes than people who do not have schizophrenia, and receiving risperidone injection or similar medications may increase this risk. Tell your doctor immediately if you have any of the following symptoms during your treatment: extreme thirst, frequent urination, extreme hunger, blurred vision, or weakness. It is very important to call your doctor as soon as you have any of these symptoms, because high blood sugar can cause a serious condition called ketoacidosis. Ketoacidosis may become life-threatening if it is not treated at an early stage. Symptoms of ketoacidosis include dry mouth, nausea and vomiting, shortness of breath, breath that smells fruity, and decreased consciousness.
• you should know that risperidone injection may cause dizziness, lightheadedness, fast or slow heartbeat, and fainting when you get up too quickly from a lying position, especially right after you receive your injection. If you feel dizzy or drowsy after you receive your injection, you will need to lie down until you feel better. During your treatment, you should get out of bed slowly, resting your feet on the floor for a few minutes before standing up.
• you should know that risperidone injection may make it harder for your body to cool down when it gets very hot or warm up when it gets very cold. Tell your doctor if you plan to do vigorous exercise or be exposed to extremely high or low temperatures.

What SPECIAL DIETARY instructions should I follow?

Unless your doctor tells you otherwise, continue your normal diet.

What should I do IF I FORGET to take a dose?

If you forget to keep an appointment to receive risperidone injection, call your doctor to schedule another appointment as soon as possible.

What SIDE EFFECTS can this medicine cause?

Risperidone injection may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• constipation
• nausea, heartburn
• weight change (gain or loss)
• headache
• tiredness
• dry mouth
• increased saliva
• breast enlargement or discharge
• late or missed menstrual periods
• decreased sexual ability
• dizziness, feeling unsteady, or having trouble keeping your balance
• muscle stiffness, spasms, or pain
• pain, itching, hardness, or a lump in the place where the medication was injected

Some side effects can be serious. If you experience any of these symptoms or those listed in the SPECIAL PRECAUTIONS section, call your doctor immediately or get emergency medical treatment:

• seizures
• agitation, fever, sweating, confusion, loss of consciousness, fast or irregular heartbeat, shivering or shaking, severe muscle stiffness or twitching, hallucinations, loss of coordination, nausea, vomiting, or diarrhea
• rash; itching; hives; swelling of the face, throat, lips, and eyes; difficulty swallowing or breathing
• unusual movements of your face or body that you cannot control
• slow movements or shuffling walk
• tightening of the neck muscles or throat tightness, difficulty swallowing
• falling down
• painful erection of the penis that lasts for hours
• fever, cough, chills and/or other signs of infection

Risperidone injection may cause other side effects. Call your doctor if you have any unusual problems while receiving 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 do in case of OVERDOSE?

In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at http://www.poisonhelp.org/help. If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.

What OTHER INFORMATION should I know?

Keep all appointments with your doctor and the laboratory. Your doctor may order certain lab tests to check your body's response to risperidone injection.

Keep a written list of all of the prescription and nonprescription (over-the-counter) medicines, vitamins, minerals, and dietary supplements you are taking. Bring this list with you each time you visit a doctor or if you are admitted to the hospital. You should carry the list with you in case of emergencies.

^¶ This branded product is no longer on the market. Generic alternatives may be available.

This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.

The American Society of Health-System Pharmacists, Inc. represents that the information provided hereunder was formulated with a reasonable standard of care, and in conformity with professional standards in the field. The American Society of Health-System Pharmacists, Inc. makes no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to such information and specifically disclaims all such warranties. Users are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information is provided for informational purposes only. The entire monograph for a drug should be reviewed for a thorough understanding of the drug's actions, uses and side effects. The American Society of Health-System Pharmacists, Inc. does not endorse or recommend the use of any drug. The information is not a substitute for medical care.

AHFS^® Patient Medication Information™ Copyright, 2025. The American Society of Health-System Pharmacists^®, 4500 East-West Highway, Suite 900, Bethesda, Maryland. All Rights Reserved. Duplication for commercial use must be authorized by ASHP.

Selected Revisions: November 15, 2025.