Combination of two long-acting injectable antipsychotics in treatment-resistant schizophrenia: A retrospective 12-month mirror-image study

Two Long-Acting Antipsychotics in a Patient with Treatment-Resistant Schizophrenia: A Case Report

Treatment-resistant schizophrenia (TRS) poses significant therapeutic challenges due to persistent symptoms, poor adherence, and high relapse rates. Long-acting injectable (LAI) antipsychotics offer a promising approach, yet limited evidence exists regarding the combination of two LAI formulations. We report the case of a 62-year-old woman with TRS, characterized by recurrent hospitalizations and inadequate responses to oral and monotherapy treatments. During her latest hospitalization, she received alternating intramuscular administrations of haloperidol decanoate (100 mg/28 days) and aripiprazole (400 mg/28 days). The dual LAI strategy resulted in a marked improvement in psychotic symptoms, functional recovery, and treatment adherence, with no reported side effects. This case highlights the potential benefits of dual LAI therapy in managing TRS, particularly in patients with non-adherence to oral medications or limited response to standard treatments. Additional studies are required to evaluate the long-term effectiveness and safety of this innovative therapeutic approach.

Combination of Two Long-Acting Antipsychotics in Schizophrenia Spectrum Disorders: A Systematic Review

BACKGROUND

Up to 34% of patients with schizophrenia are resistant to several treatment trials. Lack of continuous and adequate treatment is associated with relapse, rehospitalization, a lower effect of antipsychotic therapy, and higher risk of side effects. Long-acting injectables antipsychotics (LAI APs) enhance compliance and improve clinical outcomes and quality of life in patients with schizophrenia, and thus it may be advisable to administer two LAI APs at the same time in cases of treatment-resistant schizophrenia. The purpose of this review is to summarize the available literature regarding the combined use of two LAI APs in patients with schizophrenia or other psychotic spectrum disorders.

METHODS

An extensive literature search for relevant articles regarding any combination of two long-acting injectable antipsychotics has been performed from inception up to 9 February 2024, on PubMed, Scopus and APA PsycInfo, according to the PRISMA statement. Only studies reporting combination of two LAI APs and its clinical outcome in patients with schizophrenia and related disorders were selected.

RESULTS

After the selection process, nine case reports, four case series and two observational retrospective studies were included in the final analysis. All patients treated with dual LAI APs reported a good response, and no new or unexpected adverse effects due to the combination of two LAIs were reported. Different drug combinations were used, and the most frequent association resulted in aripiprazole monohydrate + paliperidone palmitate once monthly (32 times).

CONCLUSIONS

Our review highlights that the treatment regimen with two concurrent LAI APs is already widely used in clinical practice and is recognized as providing a promising, effective, and relatively safe therapeutic strategy for treating the schizophrenia spectrum disorders.

Patients' awareness of recovery mediates the link between clinical and level of functional remission in schizophrenia to a larger extent in those treated with long-acting antipsychotics

Background

Clinical remission is a step towards functional remission for subjects with schizophrenia. While recovery is both a subjective personal journey and a clinical outcome to be targeted, data on patient self-rated outcomes are scarce.

Objectives

(i) To determine the extent to which the association between clinical and functional remission is mediated by the subjective experience of recovery as reported by patients versus their relatives or their psychiatrist and (ii) to assess differences according to treatment, specifically with oral antipsychotics only versus long-acting injectable antipsychotics (LAIs).

Design

Clinical observational study.

Methods

Community-dwelling participants with schizophrenia enrolled in the EGOFORS cohort (N = 198) were included. Clinical symptoms and remission were assessed using the Positive and Negative Syndrome Scale. Functional remission was assessed with the Functional Remission of General Schizophrenia Scale. Awareness of recovery was assessed with one question 'What percentage of recovery do you think you have now (from 0% - no recovery - to 100% - full recovery)?', asked of the patient, also of the patient's close relative, and the psychiatrist. We used mediation analyses, taking into account the type of pharmacological treatment.

Results

Remission criteria and perceived remission measures were significantly correlated, both within and between groups (r > 0.330). The patient's awareness of recovery mediated the relationship between clinical remission and level of functional remission, while the level of recovery according to psychiatrists or close relatives did not. The direct effect of clinical remission on the level of functional remission became non-significant when taking into account the mediator (patients' awareness of recovery) in the group of patients with LAI (t = 1.5, p = 0.150) but not in the group of patients with other treatments (t = 3.1, p = 0.003).

Conclusion

Patients with LAIs may be more efficient in reporting their level of functional remission. Higher patient awareness could be an interesting candidate to explain this. However, as the study was cross-sectional, such a proposal should be tested with a more specifically designed protocol, such as a long-term cohort.