Risperidone (Risperdal)

Risperidone is pronounced ris-PER-ih-done. The brand name Risperdal is pronounced RIS-per-dal.

Risperidone is FDA-approved to treat schizophrenia in adults and adolescents ages 13 and older, acute manic or mixed episodes of bipolar I disorder, and irritability associated with autism spectrum disorder in children and adolescents ages 5 to 16. It is also prescribed off-label for schizoaffective disorder, as an adjunct for treatment-resistant OCD, as an adjunct for chronic PTSD, and for behavioral symptoms associated with intellectual disability or delirium.

Yes. Risperidone is a second-generation antipsychotic, sometimes called an atypical antipsychotic or an SGA. Second-generation antipsychotics differ from older first-generation medications in that they act on both dopamine and serotonin systems, which is associated with a lower risk of certain movement-related side effects.

Your brain uses chemical messengers called neurotransmitters to pass signals between nerve cells. Two of them — dopamine and serotonin — help regulate perception, thinking, motivation, and mood. Impairments in dopamine signaling brain pathways contribute to symptoms such as hallucinations, delusions, and disorganized thinking. Risperidone reduces dopamine signaling, which appears to reduce psychotic symptoms, while also adjusting serotonin activity, which may stabilize mood and reduce the likelihood of the adverse effects typical of older antipsychotic medications.

Clinically, risperidone acts as an antagonist at dopamine D2 receptors and serotonin 5-HT2A receptors, with additional activity at alpha-1 and alpha-2 adrenergic and histamine H1 receptors. Its combined D2 and 5-HT2A blockade is the basis for its classification as a second-generation antipsychotic.

Common side effects of risperidone include:

• Drowsiness or sedation — often most noticeable in the first few weeks. Many clinicians recommend evening dosing for this reason.
• Weight gain and increased appetite — one of the more commonly reported effects. Tracking weight and discussing diet and activity early can help.
• Dizziness or lightheadedness when standing — rising slowly from sitting or lying down can reduce this.
• Increased prolactin levels — which may cause breast tenderness, breast enlargement (in men and women), milk production, or menstrual changes.
• Restlessness or an urge to keep moving (akathisia) — report this to your clinician, as it may be manageable with a dose adjustment.
• Tremor, stiffness, or slowed movement — these uncontrolled movement symptoms appear within days or not at all, and require urgent attention. They are only managed with stopping the medication and a short term course of anti-cholinergic medication.
• Nausea, constipation, dry mouth, or drooling — usually improve over time.

Serious side effects — contact your clinician promptly or seek emergency care if you experience:

• Fever with muscle rigidity, confusion, sweating, or an irregular heartbeat (possible neuroleptic malignant syndrome)
• Uncontrolled repetitive movements of the face, tongue, or limbs (possible tardive dyskinesia)
• Significant increases in blood sugar, cholesterol, or triglycerides
• Fainting or a fall related to a sudden drop in blood pressure
• A prolonged or painful erection
• Signs of infection such as persistent fever or sore throat

For some individuals, side effects improve after days or weeks. Others may need a dose adjustment or an alternative medication. Always discuss side effects with your prescribing clinician rather than changing or stopping the medication on your own.

Yes, weight gain is one of the more commonly reported side effects of risperidone. A network meta-analysis of 18 antipsychotics found evidence of weight gain and increased BMI with risperidone compared with placebo, placing it in a moderate range — higher than aripiprazole or lurasidone, and lower than olanzapine or clozapine. Weight change varies considerably between individuals and appears to be partly dose-related. Your clinician may monitor your weight, blood sugar, and lipid levels during treatment. Speak with your prescribing clinician if weight changes are a concern so they can discuss strategies to manage this side effect.

Risperidone commonly causes drowsiness, particularly when treatment first begins or after a dose increase. Taking it in the evening means that sedation is more likely to occur while you are already sleeping rather than during the day. Evening dosing may also reduce the impact of dizziness on standing. Timing depends on your individual response and formulation, so only adjust the timing of your dose when recommended by your psychiatric clinician.

Some effects, such as reduced agitation and improved sleep, may be noticeable immediately or within the first few days. Improvements in core symptoms such as hallucinations, delusions, and disorganized thinking typically occur gradually but steadily over two to six weeks, with fuller benefit sometimes taking longer. For irritability associated with autism spectrum disorder, changes are often observed within the first few weeks. Regular follow-ups with your clinician are important to monitor your response and adverse effect, and to adjust your care plan as needed.

Yes. Risperidone raises prolactin more than most other second-generation antipsychotics. A review of preclinical and clinical research describes a significant, dose-dependent elevation of prolactin with risperidone therapy, in contrast to medications such as clozapine, olanzapine, and quetiapine. Elevated prolactin can cause breast tenderness or enlargement, milk production, irregular or absent menstrual periods, reduced sex drive, and sexual difficulties. If you notice any of these changes, tell your clinician — prolactin levels can be measured with a blood test, and options include a dose adjustment, adding another medication, or switching to an alternative.

Risperidone is FDA-approved to treat irritability associated with autism spectrum disorder in children and adolescents ages 5 to 16, including symptoms such as aggression toward others, deliberate self-injury, temper outbursts, and rapidly changing moods. It is important to note that risperidone does not treat the core features of autism, such as differences in social communication. It is typically considered alongside behavioral approaches such as ABA therapy rather than as a standalone treatment.

Risperidone is not FDA-approved for obsessive-compulsive disorder, but it is prescribed off-label as an add-on treatment when a serotonin reuptake inhibitor (SSRI) has not produced enough improvement on its own. A review of antipsychotic augmentation in OCD found that roughly one in three SSRI non-responders improve with this approach, and that risperidone and aripiprazole have the strongest supporting evidence among antipsychotics. The presence of co-occurring tics may predict a better response.

Treatment guidelines cited in that review recommend low-to-medium dosing for no longer than about three months, with discontinuation if there is no response. Risperidone is not used on its own for OCD and does not replace first-line approaches such as an SSRI or exposure and response prevention therapy. If your symptoms have not improved on your current treatment, discuss options with your prescribing clinician rather than adjusting medication yourself.

No. Risperidone is not a controlled substance and is not classified under any schedule by the Drug Enforcement Administration. It is prescription-only, meaning it requires a clinician’s prescription to obtain. Risperidone is not considered habit-forming and does not produce cravings or a high. However, stopping it suddenly can cause symptoms to return or rebound. Always follow your psychiatric provider’s directions on when to stop taking medications or change dosages.

Both risperidone and Abilify (aripiprazole) are second-generation antipsychotics used for schizophrenia and bipolar I disorder, and both are FDA-approved for irritability associated with autism spectrum disorder. The main difference is how they act on dopamine. Risperidone blocks dopamine D2 receptors, while aripiprazole is a partial agonist — it moderates dopamine activity rather than blocking it outright. In practice, risperidone is more likely to raise prolactin and cause weight gain, while aripiprazole is less likely sedating and more likely to cause restlessness. Your clinician will consider your symptoms, side effect history, and other medications when recommending one over the other.

Invega (paliperidone) is the active metabolite of risperidone — essentially the compound your body converts risperidone into. Because of this, the two have very similar effects and side effect profiles, including a shared tendency to raise prolactin. The practical differences are in formulation and processing: Invega is an extended-release oral tablet designed for once-daily dosing, and it is cleared primarily by the kidneys rather than metabolized by the liver, which can matter for individuals taking other medications. Long-acting injectable versions exist for both. Your prescribing clinician will determine which is most appropriate for your situation.

Both are second-generation antipsychotics, but their side effect profiles differ meaningfully. Risperidone is generally more potent at dopamine D2 receptors, which makes it more likely to cause prolactin elevation and movement-related side effects. Seroquel (quetiapine) is more sedating and is more often associated with drowsiness and metabolic effects, and it carries an FDA approval for bipolar depression that risperidone does not. The choice depends on your diagnosis, symptoms, and side-effect profile.

Both treat schizophrenia and bipolar I disorder. The most consistent difference is metabolic: olanzapine is associated with greater weight gain and metabolic effects than risperidone in comparative research. Risperidone, in turn, raises prolactin substantially more often than olanzapine and is somewhat more likely to cause movement-related side effects at higher doses. Only risperidone carries FDA approval for irritability associated with autism spectrum disorder. Your clinician will weigh these differences against your medical history.

The cost of risperidone varies depending on whether you receive the generic or a brand-name version, and on the formulation prescribed. As of publication date, potential pricing is listed below.

Generic risperidone:

• Oral tablets start at about $6.00 for 14 tablets (2 mg).
• Oral solution (1 mg/mL) starts at about $20.84 for 30 mL.
• Orally disintegrating tablets start at about $26.25 for 28 tablets (0.5 mg).
• Long-acting injection starts at about $253.03 per 12.5 mg/2-week dose.

Brand-name Risperdal: Oral tablets start at about $188.46 for 30 tablets (0.5 mg).

Prices can vary by location, pharmacy, and discount program.

If you have insurance, your out-of-pocket cost will depend on your supporting diagnosis and plan type (e.g., commercial, Medicare, Medicaid) and may include a copay or coinsurance.

Yes. Risperidone is the generic name and Risperdal is the original brand name. Both contain the same active ingredient, and generic risperidone typically costs substantially less. Risperdal Consta, Perseris, Uzedy, and Rykindo are additional brand names for long-acting injectable formulations of the same medication.

Oral risperidone is taken daily as a tablet, orally disintegrating tablet, or liquid. Long-acting injectable formulations — including Risperdal Consta, Perseris, Uzedy, and Rykindo — are administered by a healthcare professional every two weeks to every two months depending on the product, and release the medication gradually. Long-acting injections may be considered when consistent daily dosing is difficult. Your clinician will recommend the formulation that best fits your treatment needs.

Risperidone dosing is individualized and determined by your prescribing clinician based on your diagnosis, age, clinical response, and tolerability. Treatment typically starts at a low dose and is adjusted gradually. Oral doses over 6mg daily changes the side effect profile considerably to be more like first generation anti-psychotics. Do not adjust your dose without consulting your prescribing clinician.

Symptoms may return, particularly if the medication is stopped suddenly. Some individuals also experience discontinuation effects such as nausea, sweating, insomnia, or transient movement symptoms. Always follow your psychiatric provider’s directions on when to stop taking medications or change dosages.

Consult your prescribing clinician before starting, stopping, or combining any medications or substances with risperidone. Interactions of note include carbamazepine and other strong inducers of certain liver enzymes, which can reduce risperidone levels; fluoxetine, paroxetine, and other inhibitors of certain liver enzymes, which can raise them; medications that lower blood pressure; and other sedating medications. Share a full list of everything you take, including supplements, with your clinician.

Try to avoid alcohol while taking risperidone. Alcohol can worsen drowsiness, dizziness, and impaired coordination, and may increase the risk of falls or a drop in blood pressure. Always discuss alcohol use with your prescribing clinician.