Risperidone is an antipsychotic medication used to treat schizophrenia, acute manic episodes in bipolar disorder, and irritability linked to autism in children. It belongs to a class called atypical antipsychotics, which work primarily by adjusting the activity of dopamine and serotonin in the brain. Beyond these three approved uses, risperidone is also one of the most commonly prescribed antipsychotics for off-label purposes, particularly for managing agitation and aggression in people with dementia.
Schizophrenia
Risperidone is approved to treat schizophrenia in adults and in adolescents ages 13 to 17. It helps reduce hallucinations, delusions, and disorganized thinking. In adults, the effective dose range typically falls between 4 and 8 mg per day, though some people respond to lower or higher amounts. Adolescents generally take a lower dose, with a recommended target around 3 mg per day.
For many people with schizophrenia, risperidone is used as a long-term maintenance treatment to prevent relapse. It’s available in tablet, liquid, and long-acting injectable forms, which gives some flexibility depending on what works best for the individual.
Bipolar Disorder
Risperidone is approved for treating acute manic or mixed episodes in Bipolar I Disorder, both in adults and in children and adolescents ages 10 to 17. During a manic episode, a person may experience racing thoughts, extreme irritability, reduced need for sleep, and impulsive behavior. Risperidone can be used on its own or alongside mood stabilizers like lithium or valproate to bring these episodes under control.
The typical dose range for bipolar mania is 1 to 6 mg per day in adults, usually starting at 2 to 3 mg. Pediatric doses start lower, at 0.5 mg per day, and are gradually increased. It’s worth noting that risperidone is used for acute episodes rather than as a long-term mood stabilizer on its own.
Irritability in Autism
Risperidone is one of very few medications specifically approved for children with autism spectrum disorder. It targets irritability-related symptoms: aggression toward others, self-injury, severe temper tantrums, and rapidly shifting moods. It’s approved for children and adolescents ages 5 to 17.
Doses are weight-based and much smaller than those used for schizophrenia. Children under 20 kg (about 44 pounds) typically start at 0.25 mg per day, while those 20 kg and above start at 0.5 mg per day. In clinical trials, 90% of children who responded well were taking between 0.5 and 2.5 mg daily. The medication doesn’t treat core autism features like social communication differences; it specifically addresses the behavioral symptoms that can make daily life significantly harder for the child and their family.
Off-Label Uses
Risperidone is the most commonly prescribed antipsychotic for off-label purposes. The most prominent of these is managing behavioral and psychological symptoms of dementia, including agitation, aggression, and psychosis in people with Alzheimer’s disease. No medication is approved for this purpose in the United States, but several countries, including Australia, Canada, the United Kingdom, and New Zealand, have formally approved risperidone for dementia-related behavioral symptoms.
Other off-label uses include treatment-resistant obsessive-compulsive disorder (where it may be added to an antidepressant), Tourette syndrome, and severe anxiety or behavioral problems in various psychiatric conditions. These uses are based on clinical experience and varying levels of evidence, so the decision to prescribe risperidone off-label involves weighing the potential benefits against its side effects.
Common Side Effects
Weight gain is one of the most noticeable effects. In a study of people taking risperidone for the first time, about 63% gained weight over eight weeks, and roughly 13% gained 7% or more of their body weight. Around 10% of participants developed metabolic syndrome, a cluster of changes involving blood sugar, cholesterol, and waist circumference that raises cardiovascular risk over time. People on long-term treatment are typically monitored with blood sugar and cholesterol tests about four months after starting, then at least once a year.
Drowsiness, dizziness, and restlessness are also common, particularly when starting the medication or increasing the dose. Some people experience stiffness or involuntary muscle movements, side effects shared across the antipsychotic class.
Prolactin-Related Effects
Risperidone raises levels of prolactin, a hormone normally involved in milk production, more than most other atypical antipsychotics. Studies report that over 30% of people taking risperidone experience elevated prolactin, and some research has found levels above normal range in as many as 90% of patients.
High prolactin can cause a range of symptoms. In women, this often means irregular or missed periods, breast tenderness or discharge, and reduced fertility. In men, it can lead to breast tissue growth, erectile dysfunction, and decreased sex drive. Over the long term, persistently elevated prolactin may contribute to bone thinning (osteoporosis) because it suppresses estrogen and testosterone production. These effects are often reversible if the medication is changed or the dose is adjusted, but they’re worth discussing early because many people don’t connect these symptoms to their medication.
Safety Concerns in Older Adults
Risperidone carries a boxed warning, the most serious type of safety alert, regarding use in elderly people with dementia-related psychosis. Antipsychotics as a class are associated with an increased risk of death in this population, primarily from heart-related events and infections like pneumonia. This warning applies to all antipsychotic medications, not just risperidone, and it’s the main reason no antipsychotic has received FDA approval for dementia-related behavioral symptoms in the U.S. Despite this, risperidone remains widely prescribed for severe agitation and aggression in dementia when non-drug approaches haven’t worked, particularly in cases where the person is at risk of harming themselves or others.
Stopping Risperidone
Discontinuing risperidone abruptly can cause withdrawal symptoms, including insomnia, anxiety, depression, tremor, headache, and dizziness. The recommended approach is to taper the dose gradually over weeks or months rather than stopping suddenly. Tapering should be especially slow toward the end, because even small dose reductions at that stage produce relatively large changes in how much the drug is blocking receptors in the brain. If you’re considering stopping risperidone, working with your prescriber on a tapering plan significantly reduces the chance of uncomfortable withdrawal effects or symptom relapse.