Aripiprazole lauroxil extended release injection gained FDA approval in 2015, as a treatment for adults with schizophrenia. Like any long-term acting injectable, aripiprazole lauroxil provides assurance to families and health care professionals that patients receive therapeutic medication throughout the day.[8]
Aripiprazole lauroxil is injected into the arm or buttocks of a patient by a health care professional once every four to six weeks. Aripiprazole lauroxil is a longer-lasting and injectable version of the schizophrenia pill aripiprazole, which means that the treatment is available in two doses. Aripiprazole lauroxil, along with other drugs in its family, are not approved for treatment of elderly patients with dementia-related psychosis.[8][9]
Schizophrenia
The approval of aripiprazole lauroxil from the Food and Drug Administration in 2015 was solely for the treatment of schizophrenia in adults. The ability to supplement aripiprazole lauroxil with oral supplements of aripiprazole allows for dosing flexibility, which is important for the treatment of schizophrenia, as symptoms and intensity of the disease vary greatly from patient to patient. Additionally, as in concurrence with its sister drug aripiprazole, aripiprazole lauroxil is similar in effect of typical antipsychotic drugs.[10] In the sister drug aripiprazole, side effects for patients were less frequently extrapyramidal[clarification needed] than most antipsychotic drugs.[citation needed]
The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.[13] Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.[14] Other symptoms may include restlessness, increased sweating, and trouble sleeping.[14] Less commonly there may be a feeling of the world spinning, numbness, or muscle pains.[14] Symptoms generally resolve after a short period of time.[14]
There is tentative evidence that discontinuation of antipsychotics can result in psychosis.[15] It may also result in reoccurrence of the condition that is being treated.[16] Rarely tardive dyskinesia can occur when the medication is stopped.[14]
Overdosing
The largest known case of ingestion with a known outcome involved a 1260 mg of oral aripiprazole, 42 times the recommended dose. The patient survived and fully recovered.[citation needed]
Arristada is injected intramuscularly as an atypical antipsychotic. In one 12-week clinical trial involving 622 participants, the efficacy of extended aripiprazole was demonstrated.[9][12] Its mechanism of action is not completely known, but is thought to be converted by enzyme-mediated hydrolysis to N-hydroxymethyl aripiprazole. The hydroxymethyl aripiprazole is then hydrolysed to aripiprazole. Efficacy could be mediated through a combination of partial agonist activity D2 and 5-HT1A receptors and antagonist activity at 5-HT2A receptors. Since it is a newly[when?] approved drug by the FDA, many validation of mechanisms of action are still being studied.[12][needs update]
Aristada's activity in the body is due to aripiprazole and also dehydro-aripiprazole. Dehydro-aripiprazole has been shown to have affinities for D2 receptors. These D2 receptors have similarities to aripiprazole whereas they represent 30-40% of exposure of aripiprazole in plasma.[citation needed]
After five to six days of the single intramuscular injection appearance of aripiprazole in circulation, it additionally will be released for 36 days. In the fourth monthly injection, consecutive doses of Aristada will reach steady-state. With additional supplements of the oral aripiprazole at a dosage of 21 days during the first dose of Aristada, aripiprazole concentrations within 4 days can reach therapeutic levels.[12]
In contrast to many other depot antipsychotics, aripiprazole lauroxil is described as a non-esterchemical modification.[27] It is specifically N-lauroyloxymethylaripiprazole.[27] However, the N-lauroyloxymethyl moiety contains a laurate ester, technically making aripiprazole lauroxil an antipsychotic ester.[28] More specifically, aripiprazole lauroxil is the laurate ester of N-hydroxymethylaripiprazole.[3] Following cleavage of the laurate ester, N-hydroxymethylaripiprazole is further metabolized to aripiprazole, making aripiprazole lauroxil a prodrug of aripiprazole with N-hydroxymethylaripiprazole as an intermediate.[28][27]
^ abTurncliff R, Hard M, Du Y, Risinger R, Ehrich EW (2014). "Relative bioavailability and safety of aripiprazole lauroxil, a novel once-monthly, long-acting injectable atypical antipsychotic, following deltoid and gluteal administration in adult subjects with schizophrenia". Schizophr. Res. 159 (2–3): 404–10. doi:10.1016/j.schres.2014.09.021. PMID25266547. S2CID1036686.
^Joint Formulary Committee, BMJ, ed. (March 2009). "4.2.1". British National Formulary (57 ed.). United Kingdom: Royal Pharmaceutical Society of Great Britain. p. 192. ISBN978-0-85369-845-6. Withdrawal of antipsychotic drugs after long-term therapy should always be gradual and closely monitored to avoid the risk of acute withdrawal syndromes or rapid relapse.
^Parent M, Toussaint C, Gilson H (1983). "Long-term treatment of chronic psychotics with bromperidol decanoate: clinical and pharmacokinetic evaluation". Current Therapeutic Research. 34 (1): 1–6.
^ abJørgensen A, Overø KF (1980). "Clopenthixol and flupenthixol depot preparations in outpatient schizophrenics. III. Serum levels". Acta Psychiatrica Scandinavica. Supplementum. 279: 41–54. doi:10.1111/j.1600-0447.1980.tb07082.x. PMID6931472.
^ abReynolds JE (1993). "Anxiolytic sedatives, hypnotics and neuroleptics.". Martindale: The Extra Pharmacopoeia (30th ed.). London: Pharmaceutical Press. pp. 364–623.
^Ereshefsky L, Saklad SR, Jann MW, Davis CM, Richards A, Seidel DR (May 1984). "Future of depot neuroleptic therapy: pharmacokinetic and pharmacodynamic approaches". The Journal of Clinical Psychiatry. 45 (5 Pt 2): 50–9. PMID6143748.
^Young D, Ereshefsky L, Saklad SR, Jann MW, Garcia N (1984). Explaining the pharmacokinetics of fluphenazine through computer simulations. (Abstract.). 19th Annual Midyear Clinical Meeting of the American Society of Hospital Pharmacists. Dallas, Texas.
^Janssen PA, Niemegeers CJ, Schellekens KH, Lenaerts FM, Verbruggen FJ, van Nueten JM, Marsboom RH, Hérin VV, Schaper WK (November 1970). "The pharmacology of fluspirilene (R 6218), a potent, long-acting and injectable neuroleptic drug". Arzneimittel-Forschung. 20 (11): 1689–98. PMID4992598.
^Beresford R, Ward A (January 1987). "Haloperidol decanoate. A preliminary review of its pharmacodynamic and pharmacokinetic properties and therapeutic use in psychosis". Drugs. 33 (1): 31–49. doi:10.2165/00003495-198733010-00002. PMID3545764.
^Reyntigens AJ, Heykants JJ, Woestenborghs RJ, Gelders YG, Aerts TJ (1982). "Pharmacokinetics of haloperidol decanoate. A 2-year follow-up". International Pharmacopsychiatry. 17 (4): 238–46. doi:10.1159/000468580. PMID7185768.
^Larsson M, Axelsson R, Forsman A (1984). "On the pharmacokinetics of perphenazine: a clinical study of perphenazine enanthate and decanoate". Current Therapeutic Research. 36 (6): 1071–88.
^ abMa Z, Zhang H, Wang Y, Tang X (April 2019). "Development and evaluation of intramuscularly administered nano/microcrystal suspension". Expert Opin Drug Deliv. 16 (4): 347–361. doi:10.1080/17425247.2019.1588248. PMID30827123. S2CID73504046.