brexpiprazole
Rexulti (brexpiprazole) is an atypical antipsychotic from Otsuka that modulates dopamine and serotonin receptors. It is used in schizophrenia, as an add-on to antidepressants in major depressive disorder, and for agitation associated with dementia due to Alzheimer's disease.
This page is based on FDA prescribing information and the EMA medicine record for brexpiprazole, cross-checked with MedlinePlus; the mechanism is explained in plain language, and analogies are used only where they stay accurate.
How it works
Explains what the medicine does in the body, not dosing, side effects, or safety.
An analogy
Brain circuits affected in psychosis and depression are like radios stuck between stations - sometimes blasting static, sometimes going quiet. Brexpiprazole acts like fine tuning rather than an on-off switch: it lowers the signal where dopamine is too loud and keeps a faint broadcast going where it is too quiet.
In simple terms
Brexpiprazole belongs to a class of medicines that adjust how brain circuits respond to the chemical messengers dopamine and serotonin. It partially stimulates dopamine D2 receptors, so it calms overactive signalling without shutting it down completely, and it also acts on serotonin receptors involved in mood. This balancing helps control psychotic symptoms, lifts depression when added to an antidepressant, and settles severe agitation.
In depth
Brexpiprazole is a serotonin-dopamine activity modulator with partial agonism at D2 and 5-HT1A receptors and antagonism at 5-HT2A receptors, together with high affinity at D3 receptors. Its lower intrinsic activity at D2 compared with full agonists produces functional dopamine antagonism in hyperactive pathways while preserving basal tone. This receptor profile supports antipsychotic and antidepressant-augmenting effects with a comparatively low burden of extrapyramidal and metabolic adverse effects.
See it in motion
A schematic animation of the mechanism — simplified for clarity, not drawn to scale.
How brexpiprazole fine-tunes dopamine and serotonin as an activity modulator
- Brexpiprazole acts like fine tuning rather than an on-off switch: it lowers the signal where dopamine is too loud and keeps a faint broadcast going where it is too quiet.
- Brexpiprazole is a serotonin-dopamine activity modulator with partial agonism at D2 and 5-HT1A receptors and antagonism at 5-HT2A receptors, together with high affinity at D3 receptors.
- Its lower intrinsic activity at D2 compared with full agonists produces functional dopamine antagonism in hyperactive pathways while preserving basal tone.
- This balancing helps control psychotic symptoms, lifts depression when added to an antidepressant, and settles severe agitation.
Target: Dopamine D2 and serotonin 5-HT1A/5-HT2A receptors
Brain signalling receptors whose imbalance is linked to psychosis, depression and agitation; partial stimulation at D2 keeps dopamine signalling in a steadier middle range.
Approved uses
Approved uses differ by country and change over time. Always follow your local prescribing information.
Approved uses in United States
FDA- Adjunctive treatment to antidepressants for major depressive disorder in adults
- Treatment of schizophrenia in adults and pediatric patients 13 years of age and older
- Treatment of agitation associated with dementia due to Alzheimer's disease
Approved uses in European Union
EMA- Treatment of schizophrenia in adults and adolescents aged 13 years and older
Official sources
The statements on this page trace back to these records.
- Rxulti (brexpiprazole) — Summary of product characteristics and package leaflet, English version
European Medicines Agency
- U.S. Food and Drug Administration: brexpiprazole prescribing information
U.S. Food and Drug Administration
- MedlinePlus: brexpiprazole
MedlinePlus, U.S. National Library of Medicine
This page explains how the medicine works — it isn’t the patient leaflet. For anything that applies to you, read the leaflet that came with your medicine or ask your pharmacist.
MedUnfold provides educational content and is not medical advice. Always follow your local prescribing information and healthcare professional.