Efficacy of olanzapine long-acting injection in patients with acutely exacerbated schizophrenia: an insight from effect size comparison with historical oral data

Switch from Olanzapine Long-Acting Injectable to its Oral Equivalent during COVID-19 Pandemic: a Real World Observational Study

Schizophrenia is a psychiatric condition with chronic evolution, one of the most disabling diseases. The main cause for the disease's progression is considered to be the lack of compliance with the treatment. Long-acting injectable antipsychotics (LAIs) are an important treatment option for patients with schizophrenia. Olanzapine long-acting injection (OLZ-LAI) is a pamoate monohydrate salt of olanzapine that is administered by deep intramuscular gluteal injection. The aim of this paper is to report the effects of a sudden and unplanned switch from olanzapine long-acting injectable to oral olanzapine in remitted patients with schizophrenia due to restrictions caused by the COVID-19 pandemic. An observational study conducted in the Clinical Hospital of Psychiatry and Neurology of Brasov, Romania between April 2020 and March 2021. 27 patients with OLZ-LAI were entered into the study. Of 27 cases, 21 patients preferred to be switched to oral olanzapine (77.77%). Only 6 patients continued with the long-acting formulation. The main reason for the initiation of olanzapine pamoate in all the patients was non-adherence to oral medication (80.95%), and the mean age of starting LAI olanzapine was 36.42 years (SD ± 10.09). Within the following 12 months after switching from olanzapine LAI to OA, 15 patients (71.42%) relapsed, and 12 were admitted to the emergency psychiatric unit. The COVID-19 pandemic has brought multiple disservices to current medical practice. Sudden and unplanned switch from olanzapine long-acting formulation to oral olanzapine was followed by the high rate of relapse in remitted schizophrenia.

Current and emerging long-acting antipsychotics for the treatment of schizophrenia

Introduction: In this review, the authors discuss the role of long-acting injectable antipsychotics (LAIs) for schizophrenia, focusing on the effectiveness and new perspectives introduced by such treatment strategy. Despite their promising pharmacokinetic features and their potential advantages in medication adherence, clinical outcomes, and medical costs, LAIs are not habitually presented as an option for patients, especially in the early phase of schizophrenia.Areas covered: This review explores the panorama of available LAIs for the treatment of schizophrenia, first-episode of psychosis, approved indications, medical costs, medication adherence, side effects, effectiveness and differences between first-generation (FGA)-LAIs and second-generation (SGA)-LAIs.Expert Opinion: LAIs differ in terms of specific indications, approved injection sites, needle size, injection volume, injection interval as well as potential drug-drug interactions, and commonly reported adverse reactions. The approved indications have expanded beyond schizophrenia to include bipolar and schizoaffective disorder. SGA-LAIs are often preferred to FGA-LAIs. FGA-LAIs although are less chosen in new patients due to the induction of cognitive and extrapyramidal side effects, even if, on the other hand, many SGA-LAIs are burden by hyperprolactinemia and weight gain. After a review of the available evidence, insight is provided into the potential and current therapeutic opportunities offered by LAI antipsychotic formulations.

Postmortem redistribution of olanzapine following intramuscular administration of olanzapine pamoate in dogs

The potential for postmortem redistribution of olanzapine was investigated in beagle dogs. Olanzapine pamoate monohydrate was administered once every 14 days by intramuscular injection for 3 months to fed male dogs (n=15) at a dose of 20 mg/kg olanzapine (equivalent to 46 mg/kg olanzapine pamoate monohydrate). Blood samples were collected after the fifth (Day 57) and sixth (Day 71) doses to determine olanzapine and N-oxide olanzapine concentrations. On Day 71 at 72 h postdose, dogs were euthanized and placed on their backs without additional manipulation and held for postmortem blood, urine, and tissue collection at room temperature for up to 168 h postdose (96 h after euthanasia). Concentrations of olanzapine and N-oxide olanzapine were determined by liquid chromatography-mass spectroscopy/mass spectroscopy (LC-MS/MS). Postmortem olanzapine concentrations in blood increased up to seven-fold compared to the last quantified antemortem blood concentration. Olanzapine concentrations in vein tissue samples (surrogates for peripheral blood) also increased, whereas other tissue concentrations, such as myocardium, lung, liver, and kidney decreased over the postmortem period. An increase in blood concentration of olanzapine after death was observed in all but one animal, suggesting that postmortem redistribution may occur in dogs following biweekly intramuscular administration of olanzapine pamoate monohydrate. The rise in olanzapine concentrations in blood after death in this study may potentially be attributed to diffusion from multiple tissues to blood and, to a lesser extent, reduction of the N-oxide olanzapine metabolite back to olanzapine. However, the generalizability of these results to humans cannot be confirmed by the present study.

"Long-acting" olanzapine in maintenance therapy of schizophrenia: A study with plasma levels

INTRODUCTION

This prospective study was performed to evaluate clinical efficacy and tolerability of olanzapine long-acting injection (OLZ-LAI) and the relation between OLZ plasma level (PL) and the clinical outcome in maintenance therapy of schizophrenia.

MATERIAL AND METHODS

Twenty-five chronic schizophrenic outpatients with age ranging from 18 to 65 years were included in this 9-month study. Patients were given a dosage of either 210 or 300 or 405 mg of OLZ-LAI every 28 days. Patients were evaluated at baseline and every four weeks by Brief Psychiatric Rating Scale (BPRS) and Positive and Negative Symptom Scale (PANSS); at the same time, PL of OLZ was determined. The metabolic profile (aspartate aminotransferase, alanine aminotransferase, high-density lipoprotein, low-density lipoprotein, total cholesterol, and glucose levels) was analyzed every two months.

RESULTS

BPRS and total PANSS showed a statistically significant improvement from T2 with a clinical stabilization of psychopathological picture. PL ranged from 4.0 to 78.9 ng/ml (mean 20.59 ng/ml ± 14.66 standard deviation). The coefficient of variation of PLs was related to clinical stabilization. No post-injection delirium sedation syndrome occurred.

CONCLUSIONS

Our data reveal the efficacy of OLZ-LAI in maintenance treatment of schizophrenia at lower dosages also in comparison with that of oral therapy. OLZ-LAI seems to be useful for guaranteeing constant PL of the drug. A lesser variation of PL was the most predictable factor associated with maintenance of clinical benefit.

Incidence of tardive dyskinesia: a comparison of long-acting injectable and oral paliperidone clinical trial databases

BACKGROUND

To assess the tardive dyskinesia (TD) rate in studies of once-monthly long-acting injectable (LAI) paliperidone palmitate (PP) and once-daily oral paliperidone extended release (Pali ER).

METHODS

Completed schizophrenia and bipolar studies for PP and Pali ER (≥ 6 month duration with retrievable patient-level data) were included in this post hoc analysis. Schooler-Kane research criteria were applied using Abnormal Involuntary Movement Scale (AIMS) scores to categorise probable (qualifying AIMS scores persisting for ≥ 3 months) and persistent TD (score persisting ≥ 6 months). Spontaneously reported TD adverse events (AEs) were also summarised. Impact of exposure duration on dyskinesia (defined as AIMS total score ≥ 3) was assessed by summarising the monthly dyskinesia rate.

RESULTS

In the schizophrenia studies, TD rates for PP (four studies, N = 1689) vs. Pali ER (five studies, N = 2054), were: spontaneously reported AE, 0.18% (PP) vs. 0.10% (Pali ER); probable TD, 0.12% (PP) vs. 0.19% (Pali ER) and persistent TD, 0.12% (PP) vs. 0.05% (Pali ER). In the only bipolar study identified [Pali ER (N = 614)], TD rate was zero (spontaneously reported AE reporting, probable and persistent TD assessments). Dyskinesia rate was higher within the first month of treatment with both PP (13.1%) and Pali ER (11.7%) and steadily decreased over time (months 6-7: PP: 5.4%; Pali ER: 6.4%). Mean exposure: PP, 279.6 days; Pali ER, 187.2 days.

CONCLUSIONS

Risk of TD with paliperidone was low (< 0.2%), regardless of the formulation (oral or LAI), in this clinical trial dataset. Longer cumulative exposure does not appear to increase the risk of dyskinesias.

Clinical neurogenetics: behavioral management of inherited neurodegenerative disease

Psychiatric symptoms often manifest years before overt neurologic signs in patients with inherited neurodegenerative disease. The most frequently cited example of this phenomenon is the early onset of personality changes in "presymptomatic" Huntington patients. In some cases the changes in mood and cognition are even more debilitating than their neurologic symptoms. The goal of this article is to provide the neurologist with a concise primer that can be applied in a busy clinic or private practice.

Drug safety evaluation of olanzapine pamoate

INTRODUCTION

Olanzapine pamoate is one of three second-generation antipsychotics available as depot medication. While non-adherence is a major problem in the treatment of schizophrenia, olanzapine pamoate can improve adherence, though its use is limited by its safety profile.

AREAS COVERED

The review covers data on efficacy with a focus on tolerability and safety of olanzapine pamoate using the known databases including PubMed, Psychinfo and Embase using keywords. Relevant websites were also reviewed.

EXPERT OPINION

Olanzapine is an efficacious antipsychotic that can be used in its oral and depot formula (olanzapine pamoate) for the treatment of patients with schizophrenia. It has demonstrated superiority over conventional and some other atypical antipsychotics, with both formulas having comparable low rates of motor side effects. The side effects on body weight and glucose homeostasis are also similar in both formulas and limit its use. The only clear difference regarding side effects is 'the risk that 0.07% of injections in preclinical trials have led to a post-injection delirium/sedation syndrome event which requires a risk management plan'. Especially in outpatients this could cause inconveniences that should be overcome by offering, for example, psychological therapies or psychoeducation to effectively use the time when patients have to remain in the healthcare facilities.