Paliperidone

Paliperidone, sold under the brand name Invega among others, is an atypical antipsychotic. It is marketed by Janssen Pharmaceutica. Invega is an extended release formulation of paliperidone that uses the OROS extended release system to allow for once-daily dosing. Paliperidone is mainly used to treat schizophrenia and schizoaffective disorder.

Paliperidone
Clinical data
Trade namesInvega, Xeplion, Trevicta, others
Other names9-hydroxyrisperidone
AHFS/Drugs.comMonograph
MedlinePlusa607005
License data
Pregnancy
category
  • AU: B3
Routes of
administration		By mouth (OROS tablets), intramuscular
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability28% (oral)
Elimination half-life23 hours (by mouth)
Excretion1% unchanged in urine 18% unchanged in feces
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
ECHA InfoCard100.117.604
Chemical and physical data
FormulaC23H27FN4O3
Molar mass426.492 g·mol−1
3D model (JSmol)
 NY (what is this?)  (verify)

Paliperidone palmitate is a long-acting injectable formulation of paliperidone palmitoyl ester indicated for once-every 28 days injection after an initial titration period.

Medical use

It is used for the treatment of schizophrenia and schizoaffective disorder. In a 2013 study in a comparison of 15 antipsychotic drugs in effectiveness in treating schizophrenic symptoms, paliperidone was ranked fifth and demonstrated standard-high effectiveness. 10-14% more effective than haloperidol, quetiapine, and aripiprazole, 11% less effective than risperidone (4th), and 43% less effective than clozapine (1st).[4]

Paliperidone palmitate long-acting injection compared to risperidone for schizophrenia[5]
When flexibly dosed every four weeks, paliperidone palmitate appears comparable in efficacy and tolerability to risperidone. In short-term studies, paliperidone palmitate – the longer-acting injection – has a similar adverse effect profile to related compounds such as risperidone by mouth. No difference was found in the high rate of reported adverse sexual outcomes and paliperidone palmitate is associated with an increase in serum prolactin.[5]

Adverse effects

Sources:[6][7][8][9][10]

Very Common (>10% incidence)
Common (1–10% incidence)

Discontinuation

The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.[11] Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.[12] Other symptoms may include restlessness, increased sweating, and trouble sleeping.[12] Less commonly there may be a feeling of the world spinning, numbness, or muscle pains.[12] Symptoms generally resolve after a short period of time.[12]

There is tentative evidence that discontinuation of antipsychotics can result in psychosis.[13] It may also result in reoccurrence of the condition that is being treated.[14] Rarely tardive dyskinesia can occur when the medication is stopped.[12]

Deaths

In April 2014, it was reported that 21 Japanese people who had received shots of the long-acting injectable paliperidone to date had died, out of 10,700 individuals prescribed the drug.[15][16][17][18][19][20][21]

Pharmacology
Paliperidone[22]
SiteKi (nM)
5-HT1A617
5-HT2A1.1
5-HT2C48
5-HT72.7
α1A2.5
α2A3.9
α2C2.7
Values are Ki (nM). The smaller the value, the more strongly the drug binds to the site.

Paliperidone is the primary active metabolite of the older antipsychotic risperidone.[23] While its specific mechanism of action is unknown, it is believed paliperidone and risperidone act via similar, if not identical, pathways.[22] Its efficacy is believed to result from central dopaminergic and serotonergic antagonism. Food is known to increase the absorption of Invega type ER OROS prolonged-release tablets. Food increased exposure of paliperidone by up to 50-60%, however, half-life was not significantly affected. The effect was probably due to a delay in the transit of the ER OROS formulation in the upper part of the GI channel, resulting in increased absorption.[24]

The half-life is 23 hours.[24]

Risperidone and its metabolite paliperidone are reduced in efficacy by P-glycoprotein inducers such as St John's wort[25][26]

Pharmacokinetics of long-acting injectable antipsychotics
MedicationBrand nameClassVehicleDosageTmaxt1/2 singlet1/2 multiplelogPcRef
Aripiprazole lauroxilAristadaAtypicalWatera441–1064 mg/4–8 weeks24–35 days?54–57 days7.9–10.0
Aripiprazole monohydrateAbilify MaintenaAtypicalWatera300–400 mg/4 weeks7 days?30–47 days4.9–5.2
Bromperidol decanoateImpromen DecanoasTypicalSesame oil40–300 mg/4 weeks3–9 days?21–25 days7.9[27]
Clopentixol decanoateSordinol DepotTypicalViscoleob50–600 mg/1–4 weeks4–7 days?19 days9.0[28]
Flupentixol decanoateDepixolTypicalViscoleob10–200 mg/2–4 weeks4–10 days8 days17 days7.2–9.2[28][29]
Fluphenazine decanoateProlixin DecanoateTypicalSesame oil12.5–100 mg/2–5 weeks1–2 days1–10 days14–100 days7.2–9.0[30][31][32]
Fluphenazine enanthateProlixin EnanthateTypicalSesame oil12.5–100 mg/1–4 weeks2–3 days4 days?6.4–7.4[31]
FluspirileneImap, RedeptinTypicalWatera2–12 mg/1 week1–8 days7 days?5.2–5.8[33]
Haloperidol decanoateHaldol DecanoateTypicalSesame oil20–400 mg/2–4 weeks3–9 days18–21 days7.2–7.9[34][35]
Olanzapine pamoateZyprexa RelprevvAtypicalWatera150–405 mg/2–4 weeks7 days?30 days–
Oxyprothepin decanoateMeclopinTypical?????8.5–8.7
Paliperidone palmitateInvega SustennaAtypicalWatera39–819 mg/4–12 weeks13–33 days25–139 days?8.1–10.1
Perphenazine decanoateTrilafon DekanoatTypicalSesame oil50–200 mg/2–4 weeks??27 days8.9
Perphenazine enanthateTrilafon EnanthateTypicalSesame oil25–200 mg/2 weeks2–3 days?4–7 days6.4–7.2[36]
Pipotiazine palmitatePiportil LongumTypicalViscoleob25–400 mg/4 weeks9–10 days?14–21 days8.5–11.6[29]
Pipotiazine undecylenatePiportil MediumTypicalSesame oil100–200 mg/2 weeks???8.4
RisperidoneRisperdal ConstaAtypicalMicrospheres12.5–75 mg/2 weeks21 days?3–6 days–
Zuclopentixol acetateClopixol AcuphaseTypicalViscoleob50–200 mg/1–3 days1–2 days1–2 days4.7–4.9
Zuclopentixol decanoateClopixol DepotTypicalViscoleob50–800 mg/2–4 weeks4–9 days?11–21 days7.5–9.0
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.

History

Paliperidone (as Invega) was approved by the Food and Drug Administration (FDA) for the treatment of schizophrenia in 2006. Paliperidone was approved by the FDA for the treatment of schizoaffective disorder in 2009. The long-acting injectable form of paliperidone, marketed as Invega Sustenna in U.S. and Xeplion in Europe, was approved by the FDA on July 31, 2009. It is the only available brand in Bangladesh under the brand name "Palimax ER" manufactured & marketed by ACI Pharmaceuticals.

It was initially approved in Europe in 2007 for schizophrenia, the extended release form and use for schizoaffective disorder were approved in Europe in 2010, and extension to use in adolescents older than 15 years old was approved in 2014.[37]

Brand names

On May 18, 2015, a new formulation of paliperidone palmitate was approved by the FDA under the brand name Invega Trinza.[38] A similar 3 -monthly injection of prolonged release suspension was approved in 2016 by the European Medicines Agency originally under the brand name Paliperidone Janssen, later renamed to Trevicta.[39]

References
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