Clinical Pharmacology of Paliperidone Palmitate A Parenteral Long-Acting Formulation for the Treatment of Schizophrenia
Department of Psychiatry and Behavioral Neuroscience, University of Cincimati, 260 Stetson Street, Suite 3200, Cincinnati, OH 45219, USA. Reviews on Recent Clinical Trials
(Impact Factor: 1.07).
02/2012; 7(1):2-9. DOI: 10.2174/157488712799363307
Paliperidone Palmitate is a long-acting intramuscular atypical antipsychotic drug indicated for the acute maintenance treatment of schizophrenia in adults. Its mechanism of action, like all other atypical agents, is attributed to the antagonism of brain dopamine D2 and serotonin 5-HT2A receptors. The pharmacodynamics, pharmacokinetics, and metabolism of paliperidone palmitate are reviewed. Current studies for clinical efficacy of paliperidone palmitate for both acute and maintenance treatment and adherence in adults with schizophrenia are discussed. Studies for safety and tolerability are also reviewed.
Available from: Sofia Brissos
- "For these reasons, the initiation of LAIs has generally been confined to those periods when a patient is at least partially stabilized on their existing treatment. With some newer LAIs, such as paliperidone palmitate, rapid therapeutic levels can be attained by means of a 'loading dose regimen', allowing for its use in patients with moderate symptoms, and bringing about a rapid onset of action with no need for oral supplementation [Gilday and Nasrallah, 2012]. "
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ABSTRACT: Despite their widespread use, long acting injectable (LAI) antipsychotics (APs), are often regarded with some negativity because of the assumption of punishment, control and insufficient evolution towards psychosocial development of patients. However, LAI APs have proved effective in schizophrenia and other severe psychotic disorders because they assure stable blood levels, leading to a reduction of the risk of relapse. Therapeutic opportunities have also arisen after introduction of newer, second-generation LAI APs in recent years. Newer LAI APs are more readily dosed optimally, may be better tolerated and are better suited to integrated rehabilitation programmes.
This review outlines the older and newer LAI APs available for the treatment of schizophrenia, with considerations of past and present pharmacological and therapeutic issues. Traditional, evidence-based approaches to systematic reviews and randomized clinical trials are of limited utility in this area so this paper’s blending of experimental trials with observational research is particularly appropriate and effective.
Available from: Sedat Motor
- "The mechanism of action of paliperidone is attributed to the antagonism of brain dopamine D 2 and serotonin 5-HT 2A receptors  . Paliperidone is minimally metabolized in the liver . "
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The aim of the present study was to examine the effects of a new antipsychotic drug paliperidone palmitate on hemogram and coagulation parameters in rats.
Materials and methods:
Experiments were performed on 22 female albino Wistar rats (8-12 weeks old). Control group was given drinking water as vehicle (0.3 mL). PAL-1 rats were given 1 mg/kg paliperidone palmitate (in 0.3 mL drinking water) by oral gavage once a day for ten days and PAL-3 rats received 3 mg/kg paliperidone palmitate (in 0.3 mL drinking water) by oral gavage for ten days. Blood samples were drawn from the heart 24 hours after the last drug dose, and hemogram and coagulation parameters were measured with automated analyzers.
Hemogram did not change in the paliperidone treated groups compared to the controls. Factor VIII levels decreased in the PAL-1 and PAL-3 groups; and this decrease was significantly greater in the PAL-3. Factor IX levels decreased in PAL-3 rats, but its levels also increased in PAL-1 rats compared to the control.
Paliperidone has led to changes in the serum levels of coagulation factors VIII and IX in rats. As a result, paliperidone may be causing thromboembolism or bleeding in a dose-independent manner.
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ABSTRACT: Extended-release intramuscular paliperidone palmitate (Xeplion®; Invega® Sustenna®) [henceforth referred to as intramuscular paliperidone palmitate] is a long-acting injectable (LAI) formulation of the well established atypical anti-psychotic agent paliperidone (9-hydroxyrisperidone), which is the major active metabolite of risperidone. This article reviews, from an EU perspective, the therapeutic efficacy and tolerability of intramuscular paliperidone palmitate in the treatment of adults with schizophrenia, and the pharmacology of paliperidone that is relevant to the intramuscular formulation.
Intramuscular paliperidone palmitate 25–150mg equivalents (mg eq.) effectively reduced symptoms of schizophrenia in most short-term (9–13 weeks) placebo-controlled trials, as demonstrated by improvements in Positive and Negative Syndrome Scale (PANSS) total scores from baseline to endpoint that were significantly greater in intramuscular paliperidone palmitate than placebo recipients. The onset of clinical response was 8 days in patients who received the recommended initial 150mg eq. dose of intramuscular paliperidone palmitate into the deltoid muscle on day 1.
In a longer-term (24-week maintenance phase and variable length double-blind phase) placebo-controlled trial, intramuscular paliperidone palmitate was associated with a significantly longer time to relapse than placebo in patients with schizophrenia at a preplanned interim analysis conducted after 68 relapse events. Because of these favourable results, the study was terminated early.
In two 13-week trials, one of which was conducted in Chinese patients, intramuscular paliperidone palmitate administered using the recommended initiation dosage regimen was noninferior to LAI-risperidone in patients with schizophrenia in terms of the between-group treatment difference (intramuscular paliperidone palmitate vs LAI-risperidone) for the mean change from baseline to endpoint in PANSS total score.
The tolerability of intramuscular paliperidone palmitate was generally acceptable in clinical trials of schizophrenia. No new safety concerns were revealed compared with oral paliperidone, except for injection site-related reactions.
In conclusion, intramuscular paliperidone palmitate is a useful option for the treatment of patients with schizophrenia.
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