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Aripiprazole

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Aripiprazole
Structural formula of aripiprazole
Ball-and-stick model of the aripiprazole molecule
Clinical data
Pronunciation/ˌɛərɪˈpɪprəzoʊl/
AIR-ih-PIP-rə-zohl
Abilify /əˈbɪlɪfaɪ/
ə-BIL-if-eye
Trade namesAbilify, Aristada, others
Other namesOPC-14597; OPC14597; OPC-31; OPC31; RDC-3317
AHFS/Drugs.comMonograph
MedlinePlusa603012
License data
Pregnancy
category
Routes of
administration		By mouth, intramuscular
Drug classAtypical antipsychotic
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability87%[4][6][7]
Protein binding>99%[4][6][7]
MetabolismLiver (mostly via CYP3A4 and 2D6[4][6][7])
Elimination half-life75 hours (active metabolite is 94 hours)[4][6][7]
ExcretionKidney (27%; <1% unchanged)
feces (60%; 18% unchanged)[4][6][7]
Identifiers
  • 7-{4-[4-(2,3-Dichlorophenyl)piperazin-1-yl]butoxy}-3,4-dihydroquinolin-2(1H)-one
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.112.532 Edit this at Wikidata
Chemical and physical data
FormulaC23H27Cl2N3O2
Molar mass448.39 g·mol−1
3D model (JSmol)
  • Clc4cccc(N3CCN(CCCCOc2ccc1c(NC(=O)CC1)c2)CC3)c4Cl
  • InChI=1S/C23H27Cl2N3O2/c24-19-4-3-5-21(23(19)25)28-13-11-27(12-14-28)10-1-2-15-30-18-8-6-17-7-9-22(29)26-20(17)16-18/h3-6,8,16H,1-2,7,9-15H2,(H,26,29) checkY
  • Key:CEUORZQYGODEFX-UHFFFAOYSA-N checkY
  (verify)
Aribit (Aripiprazole) tablets

Aripiprazole, sold under the brand names Abilify and Aristada, among others, is an atypical antipsychotic.[8] It is primarily used in the treatment of schizophrenia and bipolar disorder;[8] other uses include as an add-on treatment in major depressive disorder, tic disorders.[8] Aripiprazole is taken by mouth or via injection into a muscle.[8] A Cochrane review found low-quality evidence of effectiveness in treating schizophrenia.[9]

Common side effects include restlessness, insomnia, transient weight gain, nausea, vomiting, constipation, dizziness, and mild sedation.[8] Serious side effects may include neuroleptic malignant syndrome, tardive dyskinesia, and anaphylaxis.[8] It is not recommended for older people with dementia-related psychosis due to an increased risk of death.[8] In pregnancy, there is evidence of possible harm to the fetus.[8][10] It is not recommended in women who are breastfeeding.[8] It has not been very well studied in people less than 18 years old.[8]

Aripiprazole was approved for medical use in the United States in 2002.[8] It is available as a generic medication.[11] In 2022, it was the 106th most commonly prescribed medication in the United States, with more than 6 million prescriptions.[12][13] It is on the World Health Organization's List of Essential Medicines.[14]

Medical uses

[edit]

Aripiprazole is primarily used for the treatment of schizophrenia or bipolar disorder.[7][8][4]

Schizophrenia

[edit]

The 2016 National Institute for Health and Care Excellence (NICE) guidance for treating psychosis and schizophrenia in children and young people recommended aripiprazole as a second-line treatment after risperidone for people between 15 and 17 who are having an acute exacerbation or recurrence of psychosis or schizophrenia.[15] A 2014 NICE review of the depot formulation of the drug found that it might have a role in treatment as an alternative to other depot formulations of second-generation antipsychotics for people who have trouble taking medication as directed or who prefer it.[16]

A 2014 Cochrane review comparing aripiprazole and other atypical antipsychotics found that it is difficult to determine differences as data quality is poor.[17] A 2011 Cochrane review comparing aripiprazole with placebo concluded that high dropout rates in clinical trials, and a lack of outcome data regarding general functioning, behavior, mortality, economic outcomes, or cognitive functioning make it difficult to definitively conclude that aripiprazole is useful for the prevention of relapse.[9] A Cochrane review found only low-quality evidence of effectiveness in treating schizophrenia.[9] Accordingly, part of its methodology on quality of evidence is based on the quantity of qualified studies.[18]

A 2013 review placed aripiprazole in the middle range of 15 antipsychotics for effectiveness, approximately as effective as haloperidol and quetiapine[19] and slightly more effective than ziprasidone, chlorpromazine, and asenapine, with better tolerability compared to the other antipsychotic drugs (4th best for reducing weight gain, 5th best for reducing extrapyramidal symptoms, best for reducing prolactin levels, 2nd best for prolongated QTc interval, and 5th best for sedative symptoms). The authors concluded that for acute psychotic episodes, aripiprazole results in benefits in some aspects of the condition.[20]

In 2013 the World Federation of Societies for Biological Psychiatry recommended aripiprazole for the treatment of acute exacerbations of schizophrenia as a Grade 1 recommendation and evidence level A.[21]

The British Association for Psychopharmacology similarly recommends that all persons presenting with psychosis receive treatment with an antipsychotic and that such treatment should continue for at least 1–2 years, as "There is no doubt that antipsychotic discontinuation is strongly associated with relapse during this period". The guideline further notes that "Established schizophrenia requires continued maintenance with doses of antipsychotic medication within the recommended range (Evidence level A)".[22]

The British Association for Psychopharmacology[22] and the World Federation of Societies for Biological Psychiatry suggest that there is little difference in effectiveness between antipsychotics in the prevention of relapse, and recommend that the specific choice of antipsychotic be chosen based on each person's preference and side effect profile. The latter group recommends switching to aripiprazole when excessive weight gain is encountered during treatment with other antipsychotics.[21]

Bipolar disorder

[edit]

Aripiprazole is effective for the treatment of acute manic episodes of bipolar disorder in adults, children, and adolescents.[23][24] Used as maintenance therapy, it is useful for the prevention of manic episodes but is not useful for bipolar depression.[25][26] Thus, it is often used in combination with an additional mood stabilizer; however, co-administration with a mood stabilizer increases the risk of extrapyramidal side effects.[27] In September 2014, aripiprazole had a UK marketing authorization for up to twelve weeks of treatment for moderate to severe manic episodes in bipolar I disorder in young people aged thirteen and older. Aripiprazole in low doses of 2.5 mg can cause mania in those with Bipolar disorder.[28][29][30]

Depression

[edit]

Aripiprazole is an effective add-on treatment for major depressive disorder; however, there is a greater rate of side effects such as weight gain and movement disorders.[31][32][33] The overall benefit is small to moderate and its use appears to neither improve quality of life nor functioning.[31] Aripiprazole may interact with some antidepressants, especially selective serotonin reuptake inhibitors (SSRIs) that are metabolized by CYP2D6. There are known interactions with fluoxetine and paroxetine[34] and it appears lesser interactions with sertraline, escitalopram, citalopram and fluvoxamine. CYP2D6 inhibitors increase aripiprazole concentrations to 2–3 times their normal level.[35] When strong CYP2D6 SSRIs (such as fluoxetine, paroxetine) are co-administered, the FDA recommends dose monitoring, although it is not clear the SSRI dose should be lowered.[4][36][37][38]

Autism

[edit]

Short-term data (8 weeks) shows reduced irritability, hyperactivity, inappropriate speech, and stereotypy, but no change in lethargic behaviours.[39] Adverse effects include weight gain, sleepiness, drooling, and tremors.[39] It is suggested that children and adolescents need to be monitored regularly while taking this medication to evaluate if this treatment option is still effective after long-term use and note if side effects are worsening. Further studies are needed to understand if this drug is helpful for children after long-term use.[39]

Tic disorders

[edit]

Aripiprazole is approved for the treatment of Tourette syndrome and other tic disorders.[40][41][42] It is effective, safe, and well-tolerated for this use per systematic reviews and meta-analyses.[43][44][45][46]

Obsessive-compulsive disorder

[edit]

A 2014 systematic review and meta-analysis concluded that add-on therapy with low-dose aripiprazole is an effective treatment for obsessive-compulsive disorder (OCD) that does not improve with selective serotonin reuptake inhibitors (SSRIs) alone.[47] The conclusion was based on the results of two relatively small, short-term trials, each of which demonstrated improvements in symptoms.[47][48][49][50] However, aripiprazole is cautiously recommended by a 2017 review on antipsychotics for OCD.[51] Aripiprazole is not currently approved for the treatment of OCD and is instead used off-label for this indication.[40] Depending on the dose, aripiprazole can increase impulse control issues in a small percentage of people. The FDA Drug Safety Communication warned about this side effect.[52]

Available forms

[edit]
See also: Aripiprazole lauroxil

Aripiprazole is available in the form of oral tablets, orally disintegrating tablets, oral solutions, oral films, and as injectables for intramuscular administration.[53][failed verification] It is also available in the form of aripiprazole lauroxil, a lipophilic ester prodrug of aripiprazole for use as a long-acting injectable.[53][failed verification]

Contraindications

[edit]

Contraindications to aripiprazole include known hypersensitivity to aripiprazole, among others.[8]

Adverse effects

[edit]
See also: List of adverse effects of aripiprazole

In the elderly with dementia, there is an increased risk of death.[54] In children, adolescents, and young adults, there is an increased risk of suicide.[54][55]

In adults, side effects with greater than 10% incidence include weight gain, mania, headache, akathisia, insomnia, delirium, and gastrointestinal effects like nausea, constipation, and lightheadedness.[4][6][7][35][56] Side effects in children are similar, and include sleepiness, increased appetite, and stuffy nose.[35] A strong desire to gamble, binge eat, shop, and engage in sexual activity may also occur rarely.[57][58] These urges can be uncontrollable.[57]

Uncontrolled movement such as restlessness, tremors, and muscle rigidity may occur.[35]

Discontinuation

[edit]

The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.[59] Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.[60] Other symptoms may include restlessness, increased sweating, and trouble sleeping.[60] Less commonly there may be a feeling of the world spinning, numbness, or muscle pains.[60] Symptoms generally resolve after a short period of time.[60]

There is tentative evidence that discontinuation of antipsychotics can result in psychosis as a part of a withdrawal syndrome.[61] It may also result in reoccurrence of the condition that is being treated.[62] Rarely tardive dyskinesia can occur when the medication is stopped.[60]

Overdose

[edit]

Children or adults who ingested acute overdoses have usually manifested central nervous system depression ranging from mild sedation to coma; serum concentrations of aripiprazole and dehydroaripiprazole in these people were elevated by up to 3–4 fold over normal therapeutic levels; as of 2008, no deaths had been recorded.[63][64]

Interactions

[edit]

Aripiprazole is a substrate of CYP2D6 and CYP3A4. Coadministration with medications that inhibit (e.g. paroxetine, fluoxetine) or induce (e.g. carbamazepine) these metabolic enzymes are known to increase and decrease, respectively, plasma levels of aripiprazole.[65][4]

Precautions should be taken in people with an established diagnosis of diabetes mellitus who are started on atypical antipsychotics along with other medications that affect blood sugar levels and should be monitored regularly for worsening of glucose control. The liquid form (oral solution) of this medication may contain up to 15 grams of sugar per dose.[8]

Antipsychotics like aripiprazole and stimulant medications, such as amphetamine, are traditionally thought to have opposing effects to their effects on dopamine receptors: stimulants are thought to increase dopamine in the synaptic cleft, whereas antipsychotics are thought to decrease dopamine. However, it is an oversimplification to state the interaction as such, due to the differing actions of antipsychotics and stimulants in different parts of the brain, as well as the effects of antipsychotics on non-dopaminergic receptors. This interaction frequently occurs in the setting of comorbid attention deficit hyperactivity disorder (ADHD) (for which stimulants are commonly prescribed) and off-label treatment of aggression with antipsychotics. Aripiprazole has been reported to provide some benefit in improving cognitive functioning in people with ADHD without other psychiatric comorbidities, though the results have been disputed. The combination of antipsychotics like aripiprazole with stimulants should not be considered an absolute contraindication.[66]

Pharmacology

[edit]

Pharmacodynamics

[edit]
See also: Atypical antipsychotic § Pharmacodynamics, and Antipsychotic § Comparison of medications
Aripiprazole[67][68][69]
Site Ki (nM) IA (%) Action Ref
SERTTooltip Serotonin transporter 900 – 1260 Reuptake Inhibitor [70][68]
NETTooltip Norepinephrine transporter 1340 – 2840 Reuptake inhibitor [68]
DATTooltip Dopamine transporter 2560 – 3880 Reuptake inhibitor [68]
5-HT1A 1.7 – 6.4 ~68% Partial agonist [68][71][70]
5-HT1B 570 – 1090 ND [68]
5-HT1D 57 – 79 ND [68]
5-HT1E 3000 – >10,000 ND [68]
5-HT2A 6.7 – 39 12.7% Very weak partial
agonist or antagonist 		[70][68][71]
5-HT2B 0.25 – 0.47 Inverse agonist [68]
5-HT2C 11 – 197 82% Partial agonist [70][68][71]
5-HT3 520 – 740 ND [68]
5-HT5A 960 – 1520 87% Near-full Agonist [68]
5-HT6 475 – 665 Antagonist [70][68][71]
5-HT7 6.6 – 14 58% Partial agonist [68][71][70]
α1A 26 Antagonist [68][71]
α1B 35 Antagonist [68]
α2A 74.3 Antagonist [68][71]
α2B 102 ND [68][71]
α2C 38 Antagonist [68][71]
β1 141 Antagonist [68]
β2 163 Antagonist [68]
D1 1290 – 2630 Partial agonist [70][68]
D2S 2.2 – 4.4 ~60% Partial agonist [68]
D2L 0.65 – 0.83 ~50% Partial agonist
D3 4.3 – 15.1 ~30% Partial agonist [70][68]
D4 417 – 603 ~30% Partial agonist [70][68]
D5 1240 – 3940 Antagonist [70][68]
H1 22.5 – 27.7 Neutral Antagonist [68][71][70]
H2 >10,000 ND [68]
H3 60 – 388 ND [68]
H4 >10,000 ND [68]
M1 6,780 ND [68]
M2 3,510 ND [68]
M3 4,680 ND [68][71]
M4 1,520 ND [68]
M5 2,330 ND [68]
GABAA-rho
(GABAC) 		Orthostatic
Negative allosteric modulator
NMDA
(PCP1) 		1824 Uncompetitive channel blocker
Antagonist 		[68]
NMDA
(PCP2) 		1824 Uncompetitive agonist [68]
Values are Ki (nM). The smaller the value, the more strongly the drug binds to the site. All data are for human cloned proteins, except 5-HT3 (rat), D4 (human/rat), H3 (guinea pig), and NMDA/PCP (rat).[68] IA = Intrinsic Activity

Aripiprazole's mechanism of action is different from those of the other FDA-approved atypical antipsychotics (e.g., clozapine, olanzapine, quetiapine, ziprasidone, and risperidone).[72][73][74][75] It shows differential engagement at the dopamine receptor (D2[68]). Aripiprazole is a partial agonist at dopamine D2 receptors, a partial agonist at 5-HT1A receptors, and an antagonist or very weak partial agonist and at 5-HT2A receptors.[76][77]

It appears to show predominantly partial agonistic activity on postsynaptic D2 receptors and partial agonist activity on presynaptic D2 receptors,[78] D3,[68][79][80] and partially D4[68][73] and is a partial activator of serotonin (5-HT1A,[68][81][82] 5-HT2A,[68] 5-HT2B,[68] 5-HT6, and 5-HT7).[68][75] It also shows lower effect on histamine (H1), as well as the serotonin transporter.[68][73] Aripiprazole acts by modulating neurotransmission overactivity of dopamine, which is thought to mitigate schizophrenia symptoms.[83]

There are studies to date confirming aripiprazole as an antagonist at alpha-adrenergic receptors such as α1A, α2A and α2C, the orthostatic hypotension observed with aripiprazole may be explained by its antagonist activity at adrenergic α1A receptors.[84]

As a pharmacologically unique antipsychotic with pronounced functional selectivity, characterization of this dopamine D2 partial agonist (with an intrinsic activity of ~50%)[85] as being similar to a full agonist but at a reduced level of activity presents a misleading oversimplification of its actions; for example, among other effects, aripiprazole has been shown, in vitro, to bind to and/or induce receptor conformations (i.e., facilitate receptor shapes) in such a way as to not only prevent receptor internalization (and, thus, lower receptor density) but even to lower the rate of receptor internalization below that of neurons not in the presence of agonists (including dopamine) or antagonists.[86] It is often the nature of partial agonists, including aripiprazole, to display a stabilizing effect (such as on mood in this case) with agonistic activity when there are low levels of endogenous neurotransmitters (such as dopamine) and antagonistic activity in the presence of high levels of agonists associated with events such as mania, psychosis, and drug use. In addition to aripiprazole's partial agonism and functional selectivity characteristics, its effectiveness may be mediated by its very high dopamine D2 receptor occupancy (approximately 31%, 44%, 75%, 80%, and 95% at daily dosages of 0.5 mg, 2 mg, 10 mg, 30mg and 40 mg respectively)[87][88] Aripiprazole has been characterized as possessing predominantly partial agonist activity on postsynaptic D2 receptors and partial agonist activity on presynaptic D2 receptors;[78] however, while this explanation intuitively explains the drug's efficacy as an antipsychotic, as the degree of agonism is a function of more than a drug's inherent properties as well as in vitro demonstration of aripiprazole's partial agonism in cells expressing postsynaptic (D2L) receptors, it was noted that "It is unlikely that the differential actions of aripiprazole as an agonist, antagonist, or partial agonist were entirely due to differences in relative D2 receptor expression since aripiprazole was an antagonist in cells with the highest level of expression (4.6 pmol/mg) and a partial agonist in cells with an intermediate level of expression (0.5–1 pmol/mg). Instead, the current data are most parsimoniously explained by the "functional selectivity" hypothesis of Lawler et al. (1999)".[89] Aripiprazole is also a partial agonist of the D3 receptor.[68] In healthy human volunteers, D2 and D3 receptor occupancy levels are high, with average levels ranging between approximately 75% at 2 mg/day to approximately 95% at 40 mg/day.[79][80] Most atypical antipsychotics bind preferentially to extrastriatal receptors, but aripiprazole appears to be less preferential in this regard, as binding rates are high throughout the brain.[90]

Aripiprazole is also a partial agonist of the postsynaptic serotonin 5-HT1A receptor (intrinsic activity = 68%).[68][81][82] a PET scan study of 12 patients receiving doses ranging from 10 to 30 mg found 5-HT1A receptor occupancy to be only 16% compared to ~90% for D2.[82] It is a very weak partial agonist of the Postsynaptic 5-HT2A receptor (intrinsic activity = 12.7%).[68] The drug differs from other atypical antipsychotics in having higher affinity for the D2 receptor than for the 5-HT2A receptor.[82] At the 5-HT2B receptor, aripiprazole has both great binding affinity and acts as a potent inverse agonist, "Aripiprazole decreased PI hydrolysis from a basal level of 61% down to a low of 30% at 1000 nM, with an EC50 of 11 nM".[68] Unlike other antipsychotics, aripiprazole is a high-efficacy partial agonist of the postsynaptic 5-HT2C receptor (intrinsic activity = 82%) this property may underlie the minimal weight gain seen in the course of therapy, however if used while taking antidepressants it will become a functional antagonist and increase weight gain.[91] At the presynaptic 5-HT7 receptor, aripiprazole is a very weak partial agonist with barely measurable intrinsic activity, and hence is a functional antagonist of this receptor.[68][75] Aripiprazole also shows lower but likely clinically insignificant affinity for a number of other sites such as the serotonin transporter, while it has negligible affinity for the muscarinic acetylcholine receptors[68][73]

Since the actions of aripiprazole differ markedly across receptor systems aripiprazole was sometimes an antagonist (e.g., at 5-HT6), sometimes an inverse agonist (e.g., 5-HT2B), sometimes a partial agonist (e.g., D2S, D3S, D4S, D2L). Aripiprazole was frequently found to be a partial agonist or full agonist, with an intrinsic activity that could be low (5-HT2A, 5-HT7), intermediate (D2L, 5-HT1A), or high (5-HT2C). This mixture of agonist actions at D2-dopamine receptors is consistent with the hypothesis that aripiprazole has "functionally selective" actions.[92] The "functional-selectivity" hypothesis proposes that a mixture of agonist/partial agonist/antagonist actions are likely. According to this hypothesis, agonists may induce structural changes in receptor conformations that are differentially "sensed" by the local complement of G proteins to induce a variety of functional actions depending upon the precise cellular milieu. The diverse actions of aripiprazole at D2-dopamine receptors are clearly cell-type specific (e.g., agonism, antagonism, partial agonism), and are most parsimoniously explained by the "functional selectivity" hypothesis.[68]

Since 5-HT2C receptors have been implicated in the control of depression, obsessive–compulsive disorder (OCD), and appetite, postsynaptic partial agonism at the 5-HT2C receptor might be associated with therapeutic potential in obsessive-compulsive disorder, obesity, and depression. 5-HT2C agonism has been demonstrated to induce anorexia via enhancement of serotonergic neurotransmission via activation of postsynaptic 5-HT2C receptors; it is conceivable that the 5-HT2C partial agonist actions of aripiprazole may, thus, be partly responsible for the minimal weight gain associated with this compound in clinical trials. In terms of potential action as an antiobsessional agent, it is worthwhile noting that a variety of 5-HT2A/5-HT2C agonists have shown promise as antiobsessional agents, yet many of these compounds are hallucinogenic. Aripiprazole has a favorable pharmacological profile in being a 5-HT2C partial agonist. Based on this profile, one can predict that aripiprazole may have antiobsessional and anorectic actions in humans.[68]

Wood and Reavill's (2007) review of published and unpublished data proposed that, at therapeutically relevant doses, aripiprazole may act essentially as a selective partial agonist of the D2 receptor without significantly affecting the majority of serotonin receptors.[78] A positron emission tomography imaging study found that 10 to 30 mg/day aripiprazole resulted in 85 to 95% occupancy of the D2 receptor in various brain areas (putamen, caudate, ventral striatum) versus 54 to 60% occupancy of the 5-HT2A receptor and only 16% occupancy of the 5-HT1A receptor.[93][82] It has been suggested that the low occupancy of the 5-HT1A receptor by aripiprazole may have been an erroneous measurement however.[94]

Aripiprazole acts by modulating neurotransmission overactivity on the dopaminergic mesolimbic pathway, which is thought to be a cause of positive schizophrenia symptoms.[83] Due to its partial agonist activity on D2L receptors, aripiprazole may also increase dopaminergic activity to optimal levels in the mesocortical pathways where it is reduced.[83]

Pharmacokinetics

[edit]

Aripiprazole displays linear kinetics and has an elimination half-life of approximately 75 hours. Steady-state plasma concentrations are achieved in about 14 days. Cmax (maximum plasma concentration) is achieved 3–5 hours after oral dosing. Bioavailability of the oral tablets is about 90% and the drug undergoes extensive hepatic metabolization (dehydrogenation, hydroxylation, and N-dealkylation), principally by the enzymes CYP2D6 and CYP3A4. Its only known active metabolite is dehydro-aripiprazole, which typically accumulates to approximately 40% of the aripiprazole concentration. The parenteral drug is excreted only in traces, and its metabolites, active or not, are excreted via feces and urine.[73][4]

Pharmacokinetics of long-acting injectable antipsychotics
Medication Brand name Class Vehicle Dosage Tmax t1/2 single t1/2 multiple logPc Ref
Aripiprazole lauroxil Aristada Atypical Watera 441–1064 mg/4–8 weeks 24–35 days ? 54–57 days 7.9–10.0
Aripiprazole monohydrate Abilify Maintena Atypical Watera 300–400 mg/4 weeks 7 days ? 30–47 days 4.9–5.2
Bromperidol decanoate Impromen Decanoas Typical Sesame oil 40–300 mg/4 weeks 3–9 days ? 21–25 days 7.9 [95]
Clopentixol decanoate Sordinol Depot Typical Viscoleob 50–600 mg/1–4 weeks 4–7 days ? 19 days 9.0 [96]
Flupentixol decanoate Depixol Typical Viscoleob 10–200 mg/2–4 weeks 4–10 days 8 days 17 days 7.2–9.2 [96][97]
Fluphenazine decanoate Prolixin Decanoate Typical Sesame oil 12.5–100 mg/2–5 weeks 1–2 days 1–10 days 14–100 days 7.2–9.0 [98][99][100]
Fluphenazine enanthate Prolixin Enanthate Typical Sesame oil 12.5–100 mg/1–4 weeks 2–3 days 4 days ? 6.4–7.4 [99]
Fluspirilene Imap, Redeptin Typical Watera 2–12 mg/1 week 1–8 days 7 days ? 5.2–5.8 [101]
Haloperidol decanoate Haldol Decanoate Typical Sesame oil 20–400 mg/2–4 weeks 3–9 days 18–21 days 7.2–7.9 [102][103]
Olanzapine pamoate Zyprexa Relprevv Atypical Watera 150–405 mg/2–4 weeks 7 days ? 30 days –
Oxyprothepin decanoate Meclopin Typical ? ? ? ? ? 8.5–8.7
Paliperidone palmitate Invega Sustenna Atypical Watera 39–819 mg/4–12 weeks 13–33 days 25–139 days ? 8.1–10.1
Perphenazine decanoate Trilafon Dekanoat Typical Sesame oil 50–200 mg/2–4 weeks ? ? 27 days 8.9
Perphenazine enanthate Trilafon Enanthate Typical Sesame oil 25–200 mg/2 weeks 2–3 days ? 4–7 days 6.4–7.2 [104]
Pipotiazine palmitate Piportil Longum Typical Viscoleob 25–400 mg/4 weeks 9–10 days ? 14–21 days 8.5–11.6 [97]
Pipotiazine undecylenate Piportil Medium Typical Sesame oil 100–200 mg/2 weeks ? ? ? 8.4
Risperidone Risperdal Consta Atypical Microspheres 12.5–75 mg/2 weeks 21 days ? 3–6 days –
Zuclopentixol acetate Clopixol Acuphase Typical Viscoleob 50–200 mg/1–3 days 1–2 days 1–2 days 4.7–4.9
Zuclopentixol decanoate Clopixol Depot Typical Viscoleob 50–800 mg/2–4 weeks 4–9 days ? 11–21 days 7.5–9.0
Note: All by intramuscular injection. Footnotes: a = Microcrystalline or nanocrystalline aqueous suspension. b = Low-viscosity vegetable oil (specifically fractionated coconut oil with medium-chain triglycerides). c = Predicted, from PubChem and DrugBank. Sources: Main: See template.

Chemistry

[edit]

Aripiprazole belongs to the chemical class of drugs called 2,3-dichlorophenylpiperazines and is chemically related to cariprazine, nefazodone, etoperidone, and trazodone.[105][106] It is unusual in having twelve known crystalline polymorphs.[107][108]

History

[edit]
Abilify (aripiprazole) 10 mg tablets (TR)

Aripiprazole was discovered in 1988 by scientists at the Japanese firm Otsuka Pharmaceutical and was called OPC-14597.[40][109][110][111][112][113] It was first published in 1995.[109][114] Otsuka initially developed the drug, and partnered with Bristol-Myers Squibb (BMS) in 1999 to complete development, obtain approvals, and market aripiprazole.[115]

It was approved by the US Food and Drug Administration (FDA) for schizophrenia in November 2002, and by the European Medicines Agency in June 2004;[116] for acute manic and mixed episodes associated with bipolar disorder on 1 October 2004; as an adjunct for major depressive disorder on 20 November 2007;[117] and to treat irritability in children with autism on 20 November 2009.[118] Likewise it was approved for use as a treatment for schizophrenia by the Therapeutic Goods Administration (TGA) of Australia in May 2003.[35]

Aripiprazole has been approved by the FDA for the treatment of both acute manic and mixed episodes, in people older than ten years.[119]

In 2006, the FDA required manufacturers to add a black box warning to the label, warning that older people who were given the drug for dementia-related psychosis were at greater risk of death.[120]

In 2007, aripiprazole was approved by the FDA for the treatment of unipolar depression when used adjunctively with an antidepressant medication.[4] That same year, BMS settled a case with the US government in which it paid $515 million; the case covered several drugs but the focus was on BMS's off-label marketing of aripiprazole for children and older people with dementia.[121]

In 2011 Otsuka and Lundbeck signed a collaboration to develop a depot formulation of aripiprazole.[122]

As of 2013, Abilify had annual sales of US$7 billion.[123] In 2013 BMS returned marketing rights to Otsuka, but kept manufacturing the drug.[124] Also in 2013, Otsuka and Lundbeck received US and European marketing approval for an injectable depot formulation of aripiprazole.[125][126]

Otsuka's US patent on aripiprazole expired on 20 October 2014, but due to a pediatric extension, a generic did not become available until 20 April 2015.[119] Barr Laboratories (now Teva Pharmaceuticals) initiated a patent challenge under the Hatch-Waxman Act in March 2007.[127] On 15 November 2010, this challenge was rejected by the U.S. District Court in New Jersey.[128]

Otsuka's European patent EP0367141 which would have expired on 26 October 2009, was extended by a Supplementary Protection Certificate (SPC) to 26 October 2014.,[129] The UK Intellectual Property Office decided[130] on 4 March 2015 that the SPC could not be further extended by six months under Regulation (EC) No 1901/2006. Even if the decision is successfully appealed, protection in Europe will not extend beyond 26 April 2015.

From April 2013 to March 2014, sales of Abilify amounted to almost $6.9 billion.[131]

In April 2015, the FDA announced the first generic versions.[132][133] In October 2015, aripiprazole lauroxil, a prodrug of aripiprazole that is administered via intramuscular injection once every four to six weeks for the treatment of schizophrenia, was approved by the FDA.[134][135]

In 2016, BMS settled cases with 42 US states that had charged BMS with off-label marketing to older people with dementia; BMS agreed to pay $19.5 million.[120][136]

In November 2017, the FDA approved Abilify MyCite, a digital pill containing a sensor intended to record when its consumer takes their medication.[137][138]

A new long acting injectable version of aripiprazole was approved by the FDA for the treatment of bipolar disorder 1 and schizophrenia on 27 April 2023.[139][140]

In 2024, the European Commission approved this new long acting injectable formulation of aripiprazole for the maintenance treatment of schizophrenia.[141]

Society and culture

[edit]
[edit]
Regulatory administration (country)[142][143][144] Schizophrenia Acute mania Bipolar maintenance Major depressive disorder (as an adjunct) Irritability in autism
Food and Drug Administration (US)[4] Yes Yes Yes (as an adjunct to lithium/valproate) Yes Yes (children and adolescents)
Therapeutic Goods Administration (AU) Yes Yes (as an adjunct to lithium/valproate) Yes No No
Medicines and Healthcare products Regulatory Agency (UK) Yes Yes Yes (to prevent mania) No No
European Medicines Agency (EU)[5] Yes No Yes No No

Classification

[edit]

Aripiprazole has been described as the prototypical third-generation antipsychotic, as opposed to first-generation (typical) antipsychotics like haloperidol and second-generation (atypical) antipsychotics like clozapine.[145] It has received this classification due to its partial agonism of dopamine receptors, and is the first of its kind in this regard among antipsychotics, which before aripiprazole acted only as dopamine receptor antagonists.[145] The introduction of aripiprazole has led to a paradigm shift from a dopamine antagonist-based approach to a dopamine agonist-based approach for antipsychotic drug development.[145][111]

Brand names

[edit]

Brand names of aripiprazole include Abilify, Aristada (as aripiprazole lauroxil), Arip MT, Explemed, and Arivitae, among numerous others.[146]

Research

[edit]

Attention deficit hyperactivity disorder

[edit]

Aripiprazole was under development for the treatment of attention-deficit hyperactivity disorder (ADHD), but development for this indication was discontinued.[40] A 2017 meta review found only preliminary evidence (studies with small sample sizes and methodological problems) for aripiprazole in the treatment of ADHD.[147] A 2013 systematic review of aripiprazole for ADHD similarly reported that there is insufficient evidence of effectiveness to support aripiprazole as a treatment for the condition.[148] Although all 6 non-controlled open-label studies in the review reported effectiveness, two small randomized controlled trials found that aripiprazole did not significantly decrease ADHD symptoms.[148] A high rate of adverse effects with aripiprazole such as weight gain, sedation, and headache was noted.[148] Most research on aripiprazole for ADHD is in children and adolescents.[148][147] Evidence on aripiprazole specifically for adult ADHD appears to be limited to a single case report.[149][150]

Substance dependence

[edit]

Aripiprazole has been studied for the treatment of amphetamine dependence and other substance use disorders, but more research is needed to support aripiprazole for these potential uses.[151][152][153][154] Available evidence of aripiprazole for amphetamine dependence is mixed.[151][152][153][154] Some studies have reported attenuation of the effects of amphetamines by aripiprazole, whereas other studies have reported both enhancement of the effects of amphetamines and increased use of amphetamines by aripiprazole.[151][152][153][154] As such, aripiprazole may not only be ineffective but potentially harmful for treatment of amphetamine dependence, and caution is warranted with regard to its use for such purposes.[151][152][153][154]

Other uses

[edit]

As of May 2021, aripiprazole is in phase III clinical trials for the treatment of agitation and pervasive child development disorders.[40]

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[edit]
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