Brexpiprazole: Difference between revisions

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{{MedTemplate

~~| generic = Brexpiprazole~~

| brand = Rexulti

| classes = Atypical antipsychotic, D2/5HT1A partial agonist with stronger α1A, 5HT2A, 5HT1A activity than aripiprazole

~~| structure =~~

| mechanism = Partial agonist at D2 and 5HT1A. Antagonist at 5HT2A, α1A, α1B, α2C. More potent 5HT2A antagonism, 5HT1A partial agonism, and α1 antagonism (relative to D2 partial agonism) than aripiprazole, proposed to reduce akathisia and enhance affective/cognitive effects.

| classes = ~~Antipsychotic~~, ~~Neuroleptic~~

| uses = Schizophrenia (FDA-approved 2015). Adjunctive treatment of major depressive disorder (2015). '''Agitation associated with dementia due to Alzheimer disease''' (FDA-approved May 2023, first agent specifically approved for this problem). Investigational for PTSD (combined with sertraline).

| mechanism = D2~~/5-HT1A~~ partial ~~agonist; 5-HT2A~~/~~alpha antagonist~~

| starting_dose = Schizophrenia: 1 mg PO daily × 4 days, then 2 mg daily × 3 days, then 4 mg daily. MDD adjunct: 0.5-1 mg daily, increase to 2 mg max. AD agitation: 0.5 mg daily, titrate to 2-3 mg daily.

| uses =

| preparations = 0.25 mg, 0.5 mg, 1 mg, 2 mg, 3 mg, 4 mg tablets

| starting_dose =

| fda_max = 4 mg/d (schizophrenia); 3 mg/d (AD agitation); 3 mg/d (MDD adjunct)

| preparations =

| routes = Oral

| fda_max =

| onset = Weeks for psychosis/depression; AD agitation benefit emerges over weeks

| routes =

| duration = Daily dosing

| onset =

| halflife = ~91 hours

| duration =

| bioavailability = ~95%

| halflife =

| pregnancy = Limited data; National Pregnancy Registry available

| bioavailability =

| legal = Rx

| pregnancy =

| intro = '''Brexpiprazole''' (brand name Rexulti) is a 'pip' D2/5HT1A partial agonist FDA-approved for schizophrenia (2015), adjunctive treatment of major depressive disorder (2015), and, in a landmark 2023 approval, '''agitation associated with Alzheimer dementia'''. It is the first FDA-approved medicine specifically for AD agitation. Compared to its 'pip' cousin aripiprazole, brexpiprazole has relatively stronger 5HT2A antagonism, 5HT1A partial agonism, and α1 antagonism, proposed to reduce akathisia and enhance affective/cognitive efficacy.

| legal =

| intro =

The AD agitation approval carries the antipsychotic class black-box warning for increased mortality in elderly dementia patients; FDA approval rested on demonstrating a favorable risk-benefit ratio in this population specifically for the problem.

~~| pharmacokinetics =~~

| pharmacodynamics= D2 partial agonist (lower intrinsic activity than aripiprazole). 5HT1A partial agonist. 5HT2A, 5HT2B, 5HT7, α1A, α1B, α2C antagonist. H1 antagonism. Notable: lower D2 intrinsic activity and stronger 5HT2A antagonism may underlie reduced akathisia compared with aripiprazole.

| pharmacodynamics =

| effects = Weight gain (especially long-term), akathisia (reduced compared to aripiprazole), restlessness, headache, somnolence, increased fasting glucose. Class warning: increased mortality in elderly dementia-related psychosis. AD agitation problem acknowledges this risk with specific benefit-risk analysis.

~~| indications =~~

| interactions = <pharmaInteractions/>

~~| dosing~~ =

| effects =

| interactions = <pharmaInteractions/>

~~| pregnancy_details =~~

~~| monitoring =~~

~~| counseling =~~

~~| anecdotes =~~

~~| seealso =~~

~~| references =~~

}}

[[Category:Second-generation neuroleptics]]

~~[[Category:Antipsychotics / Neuroleptics]]~~

[[Category:Second-~~Generation Antipsychotics (SGAs / Atypicals)~~]]

[[Category:Neuroleptics]]

[[Category:Third-generation neuroleptics]]

[[Category:Atypical Antipsychotics]]

[[Category:Dopamine Partial Agonists]]

[[Category:Psychotic Disorders]]

[[Category:Adjunctive Antidepressants]]

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