Antipsychotics
also known as neuroleptics
Medically reviewed by the Shrinkopedia editorial team, led by Shariq Refai, MD, MBA, FAPA.
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Antipsychotics are a class of medication used mainly to treat psychosis, the symptoms that affect a person's grip on reality, such as hallucinations and delusions. They're a core, evidence-based treatment for schizophrenia, and they're also used in bipolar disorder. They have real side effects that vary by drug, so treatment includes monitoring with a prescriber. This is an overview, and decisions belong with a prescriber.
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Definition
Antipsychotics, sometimes called neuroleptics, are a class of medication used to treat psychosis and several related conditions.
They're most central to the treatment of schizophrenia, where they're a core, evidence-based part of care. They're also used in bipolar disorder, for episodes of mania and as ongoing maintenance treatment, and sometimes as an add-on in depression and for other specific uses. They're commonly grouped into "first-generation" antipsychotics, the older drugs, also called "typical," and "second-generation" or "atypical" antipsychotics. The second-generation drugs are more commonly chosen first today. This entry is a general overview; for drug-by-drug detail and dosing, see PsychiatryRx.org.
### Common second-generation antipsychotics at a glance
| Agent | Typical adult dose | D2 profile | Metabolic risk | Notable features |
|---|---|---|---|---|
| aripiprazole | 10-30 mg | partial agonist | low | activating in some; akathisia common; approved for MDD augmentation |
| brexpiprazole | 1-4 mg | partial agonist | low-moderate | approved for MDD augmentation and schizophrenia |
| cariprazine | 1.5-6 mg | D3-preferring partial agonist | low-moderate | evidence in bipolar depression; long half-life |
| risperidone | 1-8 mg | full antagonist | moderate | hyperprolactinemia common at higher doses; long-acting injectable options |
| paliperidone | 3-12 mg | full antagonist | moderate | active metabolite of risperidone; multiple long-acting injectables (monthly to every 6 months) |
| olanzapine | 5-20 mg | full antagonist | high | strong efficacy; substantial weight gain, metabolic syndrome risk |
| quetiapine | 150-800 mg | full antagonist | high | sedating; approved for bipolar depression; XR formulation for MDD augmentation |
| ziprasidone | 40-160 mg | full antagonist | low | must be taken with ≥500 kcal food; QT prolongation |
| lurasidone | 40-160 mg | full antagonist | low | must be taken with ≥350 kcal food; approved for bipolar depression |
| clozapine | 300-600 mg | full antagonist | high | most effective for treatment-resistant schizophrenia; requires REMS enrollment (agranulocytosis, myocarditis) |
What it looks like
- A person starting an antipsychotic after a first episode of psychosis, as a central part of their care.
- A prescriber choosing a second-generation drug and scheduling regular check-ins to track effects.
- Routine monitoring of weight, blood sugar, and other measures, because some drugs affect metabolism.
- Continuing a medication during stable periods to reduce the chance of a relapse.
What people often confuse this with
Sedatives or "chemical straitjackets." This is a stigmatizing misconception. Antipsychotics aren't simply sedatives, and the "chemical straitjacket" image is inaccurate. They act on the symptoms of psychosis. Some can cause drowsiness, but that isn't their purpose or their mechanism.
Addictive drugs. Antipsychotics aren't addictive in the usual sense. They don't produce the craving and compulsive use seen with addictive substances. Stopping them suddenly can still cause problems, including relapse, so changes are made gradually with a prescriber.
A cure. Antipsychotics treat symptoms and reduce the risk of relapse. They don't cure schizophrenia or bipolar disorder. They're an ongoing part of managing the condition, often alongside therapy and support.
Reality check
Myth: Antipsychotics are just chemical restraints that dull people out.
This idea is stigma, not fact. Antipsychotics work on the symptoms of psychosis, and the goal is to help a person think more clearly and function better, not to flatten them. They're a core, evidence-based treatment for schizophrenia.
Myth: The side effects mean these drugs do more harm than good.
Side effects are real and they matter, and they vary by drug. The older drugs carry more risk of movement-related effects, including, rarely, tardive dyskinesia. Many newer drugs can cause weight gain and metabolic changes. None of that erases the benefit. For psychosis, the evidence that antipsychotics help is strong, and monitoring with a prescriber is how the risks are managed.
Myth: If you feel better, you can just stop taking them.
Feeling well often means the medication is working. Stopping suddenly can trigger a relapse and other problems. Any change should be made gradually and with a prescriber, who can weigh the options with you.
What research says
Antipsychotics have a strong evidence base. They're recommended as a core treatment for schizophrenia by major clinical guidelines, supported by randomized trials showing they reduce symptoms of psychosis and lower the risk of relapse.
- For schizophrenia, antipsychotics are central to both treating acute episodes and preventing relapse.
- In bipolar disorder, they're used for mania and as maintenance treatment, and several are approved for these uses.
- Some are used as an add-on in depression and for other specific indications.
- Side-effect profiles differ between drugs, which is a major reason treatment is individualized and monitored.
The honest, balanced picture is this: antipsychotics clearly help with psychosis and are a well-supported treatment, and they also carry side effects that need ongoing attention. The older and newer drugs differ, with movement-related effects more associated with first-generation drugs and metabolic effects with many second-generation ones. Good care means matching the drug to the person and monitoring over time.
What we know and what we don't know
What we know
- Antipsychotics are a core, evidence-based treatment for schizophrenia and reduce the risk of relapse.
- They're also used in bipolar disorder and sometimes as an add-on in depression.
- They have real side effects that vary by drug, so prescriber monitoring is part of treatment.
What we don't know
- We can't reliably predict which antipsychotic will work best, or be best tolerated, for a given person.
- Their full long-term effects, and how to balance benefits and risks over many years, are still being studied.
- Exactly why response varies so much between people isn't fully explained.
Questions people ask
Are antipsychotics only for schizophrenia?
No. They're used for bipolar disorder (both mania and, for some, depression), schizoaffective disorder, augmentation of antidepressants in treatment-resistant depression, agitation in dementia (carefully), delirium (short-term), and Tourette syndrome. Some have FDA approvals for these specific indications.
What's the difference between typical and atypical antipsychotics?
Typical (first-generation) antipsychotics were developed in the 1950s and 1960s. They block dopamine D2 receptors strongly and are more likely to cause motor side effects. Atypical (second-generation) antipsychotics were developed later and generally have lower risk of motor side effects, though higher risk of metabolic side effects. Both have real utility; choice depends on the picture.
What are the main side effects to know about?
Metabolic effects (weight gain, increased blood sugar, cholesterol changes, particularly with olanzapine and clozapine), motor effects (particularly with first-generation), sedation, and various others depending on the specific agent. Long-term risks include tardive dyskinesia (involuntary movements that can be permanent), which is more common with first-generation.
Is clozapine dangerous?
Clozapine has meaningful risks (agranulocytosis, myocarditis, seizures) that require monitoring, but it also has the strongest evidence of any antipsychotic for treatment-resistant schizophrenia and for reducing suicide risk in schizophrenia. Careful use with monitoring provides real benefit for people who need it.
How long do I need to be on an antipsychotic?
Depends on the condition. For schizophrenia, long-term treatment is standard, particularly after a first episode. For bipolar disorder, may be part of long-term regimen or used only during specific episodes. For treatment-resistant depression augmentation, usually until the depression is stable.
How it works
A few things are worth understanding about how antipsychotics work and how they're used:
- they act largely on dopamine signaling in the brain, and the atypicals also act on serotonin (PsychiatryRx lets you see how antipsychotics act on dopamine)
- they reduce symptoms of psychosis, such as hallucinations and delusions, and help prevent relapse
- they're grouped into first-generation (older, typical) and second-generation (atypical) drugs
- second-generation drugs are more commonly used first now, partly because of their side-effect profiles
- they're often used alongside other treatment, including psychotherapy and social support
- they treat symptoms and lower the risk of relapse, but they aren't a cure
Medications in this class
First-generation ("typical") antipsychotics
Haloperidol
Chlorpromazine
Fluphenazine
Second-generation ("atypical") antipsychotics
Risperidone
Olanzapine
Clozapine
- ANC (absolute neutrophil count). Baseline ANC ≥ 1.5 × 10⁹/L required to start (≥ 1.0 × 10⁹/L in benign ethnic neutropenia / DARC-null). Weekly ANC for the first 6 months, every 2 weeks for months 6-12, then monthly indefinitely. As of February 24, 2025, the FDA eliminated the mandatory REMS program, but monitoring per the prescribing information remains standard of care. Discontinue for ANC < 1.0 × 10⁹/L (< 0.5 × 10⁹/L in benign ethnic neutropenia). See the FDA Drug Safety Communication: https://www.fda.gov/drugs/drug-safety-communications/fda-removes-risk-evaluation-and-mitigation-strategy-rems-program-antipsychotic-drug-clozapine
- Myocarditis/cardiomyopathy. Baseline and week 4 troponin, CRP, ECG; clinical vigilance for tachycardia, fever, chest pain, dyspnea in weeks 1-4.
- Metabolic. Same schedule as olanzapine; co-commence metformin per Carolan/Schizophrenia Bulletin guideline.
- Seizure risk. Dose-dependent; consider EEG if > 600 mg/day or serum > 600 ng/mL.
- Constipation/ileus. Assess bowel function at every visit; scheduled laxatives often indicated.
- Sialorrhea, tachycardia, orthostasis. Symptom-based management.
Quetiapine
Aripiprazole
Ziprasidone
Paliperidone
Lurasidone
Cariprazine
Brexpiprazole
Asenapine and iloperidone
Asenapine is sublingual/transdermal and iloperidone is orthostasis-prone; standard second-generation metabolic and EPS monitoring apply. See FDA labels (Saphris, Fanapt).
Long-acting injectable considerations. LAIs require baseline oral tolerability testing (except paliperidone palmitate and aripiprazole lauroxil, which don't need it under specific initiation regimens). Monitoring frequency is unchanged from oral.
- Pregnancy and breastfeeding. Every entry should link to condition-specific perinatal considerations and reference LactMed/NICE/APA perinatal guidance.
- Drug interactions. SSRIs/SNRIs + MAOIs (14-day washout, 5 weeks for fluoxetine); lithium + NSAIDs/ACEi/thiazides; carbamazepine broad CYP induction; clozapine + fluvoxamine, ciprofloxacin.
- Discontinuation. Taper SSRIs, SNRIs, benzodiazepines, and antipsychotics gradually. Fastest tapers (paroxetine, venlafaxine, short-acting benzos) carry the most discontinuation symptoms.
- Metabolic monitoring standard. Per the ADA/APA consensus, still the standard framework in 2026: baseline, 4, 8, 12 weeks, then quarterly: weight/BMI, waist. Baseline, 3 months, then annually: fasting glucose or HbA1c, fasting lipids, BP.
- QTc considerations. Baseline ECG for citalopram > 20 mg (age > 60), ziprasidone, IV haloperidol, thioridazine, and any combination of QT-prolonging agents.
Sources
- American Psychiatric Association (APA). Practice guidelines for the treatment of schizophrenia and bipolar disorder.
- National Institute for Health and Care Excellence (NICE). Guidance on psychosis, schizophrenia, and bipolar disorder.
- US Food and Drug Administration (FDA). Approved labeling for antipsychotic medications.
- National Institute of Mental Health (NIMH). Mental health medications.
- FDA prescribing information (label) for each drug, accessed via DailyMed.
- APA Practice Guidelines (Schizophrenia 3rd ed.; MDD; Bipolar Disorder; OCD).
- NICE Guidelines: NG222 (Depression 2022), CG185 (Bipolar 2014, updated), CG178 (Psychosis and schizophrenia 2014, updated), NG215 (Medicines associated with dependence).
- ADA/APA Consensus on Antipsychotic Drugs and Obesity/Diabetes (2004, still foundational; updates via ISBD/EPA metabolic monitoring statements).
- Carolan A, et al. Metformin for the Prevention of Antipsychotic-Induced Weight Gain: Guideline Development and Consensus Validation. Schizophrenia Bulletin. 2025;51(5):1193-1203.
- FDA Drug Safety Communication: Clozapine REMS elimination (February 24, 2025).
- AAPP Clozapine in Practice guideline (2025 updates).
- International Society for Bipolar Disorders (ISBD) lithium and mood-stabilizer consensus statements.
- APA/ASKP Consensus on Ketamine and Esketamine (2017 base; 2023-2025 updates).
- Beers Criteria (AGS 2023) and STOPP/START v3 (2023) for prescribing in older adults.
- Cochrane systematic reviews for individual class efficacy and safety.
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Antipsychotics. Shrinkopedia, medically reviewed by Shariq Refai, MD, MBA. https://shrinkopedia.com/treatments/antipsychotics/- APA
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Medical disclaimer
Shrinkopedia is for education, not medical advice. It can't tell you whether an antipsychotic is right for you, and it isn't a substitute for care from a licensed clinician. Decisions about antipsychotic medication belong with a prescriber, who can weigh the benefits, the side effects, and your situation with you.
If you're in crisis or thinking about harming yourself, call or text 988 in the US to reach the Suicide and Crisis Lifeline, or call 911.
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