Medication guide

Brexpiprazole (Rexulti)

What is brexpiprazole?

Brexpiprazole is known as Rexulti in the United States and Japan alike (レキサルティ on Japanese packaging). It's a dopamine-and-serotonin-balancing medication in the family called antipsychotics, a name that describes the drug group, not what taking it says about you. It's the newer sibling of aripiprazole (Abilify), designed along the same lines with some rough edges smoothed.

How is it different from other antipsychotics?

A balancer, not a blocker: like its sibling aripiprazole, it steadies dopamine signalling in both directions
Tends to cause less restlessness (akathisia) than its older sibling, which is often the deciding factor
One of the less sedating, more weight-neutral options in its family, though monitoring still matters
Works at both ends: full doses for schizophrenia, low doses as an antidepressant booster

What is it used for in Japan?

Schizophrenia
Depression, as an add-on when an antidepressant alone hasn't been enough
Agitation and aggression linked to Alzheimer's-type dementia

How does it help?

By steadying dopamine and serotonin activity, it calms symptoms and helps lift a stalled response to an antidepressant. Some effect can appear within the first weeks; give it time and keep taking it as prescribed.

What should I tell my doctor before starting?

A few situations rule it out entirely; your doctor will choose something else if any of these apply:

A past allergic reaction to brexpiprazole
Being under the strong influence of sedatives, sleeping-drug overdose, or anesthesia (a coma-like or deeply sedated state)
Treatment with adrenaline (epinephrine), except emergency allergy injections and some dental anesthesia

And tell your doctor first if any of these apply; these usually just need adjustments or a closer eye:

Diabetes, high blood sugar, or a family history of diabetes
Certain antifungals or antibiotics (like itraconazole or clarithromycin), or the antidepressants paroxetine and fluoxetine; these change brexpiprazole's level, so the dose is adjusted
A history of seizures
Regular alcohol use; it amplifies drowsiness
Pregnant, planning to be, or breastfeeding (see the section below)

Your doctor may check your weight and blood sugar now and then. If you notice unusual thirst, drinking a lot, or passing urine much more than usual, tell us promptly.

How do I take it, and what if I miss a dose?

Brexpiprazole is taken once a day, with or without food.

If you miss a dose: take it when you remember, unless the next dose is close; in that case just skip. Never take a double dose to catch up
The first weeks are when restlessness (see below) is most likely to appear; report it early rather than enduring it

What side effects should I expect?

Most are mild and settle within the first weeks as your body adjusts, and many can be eased with a counter-medicine if needed. Not everyone gets them.

Restlessness or an urge to keep moving (akathisia): less common than with its older sibling, but still the one to tell us about early; lowering the dose, adjusting timing, or adding a medicine that counters it usually settles it
Weight gain, in some people
Trouble sleeping, or drowsiness
Headache
A rise in prolactin (a hormone), which can affect periods or cause breast changes; tell your doctor if you notice this

If anything is bothering you, tell your doctor; there's often a way to adjust. And if you ever feel worse instead of better, tell us straight away; it's easily managed, and that's what we're here for.

Finally, two things that are rare enough that most people never experience them, but knowing them makes them easy to handle:

A combination of high fever, muscle stiffness, and confusion (on the order of 1 in 1,000 people or fewer): if this happens, get medical care promptly; recognised early, it's manageable
New strong urges that are hard to resist (gambling, spending, eating): uncommon, and it reverses when the medicine is adjusted; just mention it if you notice it

Will I become dependent? How do I stop safely?

No; brexpiprazole isn't addictive and doesn't cause cravings. Stopping is about timing rather than withdrawal: coming off too early can let symptoms return, so the decision and the pace are planned with your doctor. Don't stop it on your own, even when you feel well; feeling well is usually the medicine doing its job.

Can I drive while taking it?

The Japanese label advises against driving while taking it. Brexpiprazole can cause drowsiness, and the label here instructs that patients on it shouldn't drive or operate dangerous machinery. In practice this is a conversation with your doctor: be especially careful when starting or raising the dose.

What about pregnancy and breastfeeding?

Often, treatment can continue when it's needed; the decision is individual. Untreated illness carries real risks in pregnancy too, so this is a planning conversation, not an automatic stop; never stop on your own on learning you're pregnant. Breastfeeding is decided case by case. Our guides to medication in pregnancy and medication while breastfeeding cover the details.