Efficacy and safety of risperidone long-acting injection in elderly people with schizophrenia

Long-Acting Injectable Antipsychotics in the Geriatric Population: A longitudinal Study

OBJECTIVE

This study compares demographic, clinical characteristics, and outcomes in older adults on long-acting injectable antipsychotics (LAI-AP) vs. oral antipsychotics (PO-AP).

DESIGN

This observational study with a retrospective cohort utilized the electronic medical record's search engine to review charts of geriatric patients on LAI-AP for a two-year period. A convenience sample on PO-AP formed the comparison group. LAI-AP patients were subcategorized into discontinuation and continuation groups.

SETTING

Conducted at an urban, psychiatric outpatient clinic, using charts from October 2020 to 2022.

PARTICIPANTS

Patients at least 60 years-old with psychotic or mood disorders on antipsychotics for at least 3-months during the study period.

MEASUREMENTS

Demographic and clinical variables, including diagnosis, medication type, side effects, medical comorbidities, neurocognitive status, and secondary medications, were collected for both PO-AP and LAI-AP groups. Outcome variables included missed appointments, psychiatric and medical hospitalizations, and emergency room visits. Correlates of discontinuation of LAI-AP were also assessed.

RESULTS

LAI-AP had a higher proportion than PO-AP of primary psychotic disorders (87.8% vs. 64.3%). During the study, PO-AP had higher rates of missed appointments (median 18% vs. 13% for LAI-AP) and psychiatric admissions (mean 0.019/month vs. 0.006/month for LAI-AP;); Female sex was a risk factor for discontinuation of LAI-AP (86.7% of discontinuation group vs. 55.2% of continuation group).

CONCLUSIONS

The LAI-AP group showed reduced hospitalizations, better treatment engagement, and comparable tolerability to PO-AP. Preliminary data suggests gender may influence LAI-AP discontinuation rates. This study adds to the sparse literature investigating the efficacy and tolerability of LAI-AP in geriatric patients.

Recent Advances in representative small-molecule DRD2 inhibitors: Synthetic Routes and clinical applications

The dopamine D2 receptor (DRD2) represents a pivotal target for therapeutic intervention in the treatment of neuropsychiatric disorders, including schizophrenia, bipolar disorder, and Parkinson's disease. The successful discovery of numerous effective DRD2 inhibitors has led to their clinical application and ongoing evaluation in various clinical trials. This review explores the synthetic approaches and clinical applications of prototypical small-molecule DRD2 inhibitors that have received approval or are currently undergoing clinical trials, highlighting their therapeutic potential and challenges. The synthesis of these inhibitors employs various chemical strategies, including modifications of phenothiazine and butyrophenone structures, which have yielded significant antipsychotic agents like chlorpromazine and haloperidol. Additionally, newer classes of inhibitors, such as aripiprazole, exhibit partial agonist activity at DRD2, offering a unique therapeutic profile. Clinically, DRD2 inhibitors demonstrate efficacy in managing positive symptoms of schizophrenia, manic episodes in bipolar disorder, and dopaminergic imbalance in Parkinson's disease. However, the emergence of adverse effects, including tardive dyskinesia, extrapyramidal symptoms and metabolic syndrome, presents substantial challenges. Advances in the development of second-generation antipsychotics aim to balance efficacy with a better side effect profile by targeting additional neurotransmitter receptors. This review aims to deliver an overview of the synthesis and clinical applications of representative small-molecule DRD2 inhibitors across various clinical phases, thereby offering strategic insights for the advancement of DRD2 inhibitor development.

Risperidone accelerates bone loss in rats with autistic-like deficits induced by maternal lipopolysaccharides exposure

AIMS

Patients with neurodevelopmental disorders, usually suffer from bone diseases. Many studies have revealed a higher risk of fracture after atypical antipsychotic drug Risperidone (RIS) treatment, which is usually used to treat such disorders. It remains debatable whether neurodevelopmental disorders by itself are the cause of bone diseases or pharmacotherapy may be the reason.

MATERIALS AND METHODS

This study attempts to evaluate the biomechanical, histological, stereological, and molecular properties of bones in the offspring of Lipopolysaccharide (LPS) and saline-treated mothers that received saline, drug vehicle or the atypical antipsychotic drug risperidone (RIS) at different days of postnatal development. After postnatal drug treatment, animals were assessed for autistic-like behaviors. Then their bones were taken for evaluations.

RESULTS

Maternal LPS exposure resulted in deficits in all behavioral tests and RIS ameliorated these behaviors (p < 0.01& p < 0.05). The administration of LPS and RIS individually led to a significant decrease in the biomechanical parameters such as bone stiffness, strength and the energy used to fracture of bone. The numerical density of osteocalcin-positive cells were significantly decreased in these groups. These rats also had decreased RUNX2 and osteocalcin gene expression. When LPS rats were treated with RIS, these conditions were accelerated (p < 0.001).

DISCUSSIONS

The results of our preclinical study, consistent with previous studies in animals, explore that autistic-like deficits induced by prenatal exposure to LPS, can reduce bone stability and bone mass similar to those observed in neurodevelopmental disorders, and, for the first time, reveal that this condition worsened when these animals were treated with RIS.

Use of atypical antipsychotics in the elderly: a clinical review

The use of atypical antipsychotic drugs in the elderly has become wider and wider in recent years; in fact, these agents have novel receptor binding profiles, good efficacy with regard to negative symptoms, and reduced extrapyramidal symptoms. However, in recent years, the use of both conventional and atypical antipsychotics has been widely debated for concerns about their safety in elderly patients affected with dementia and the possible risks for stroke and sudden death. A MEDLINE search was made using the words elderly, atypical antipsychotics, use, schizophrenia, psychosis, mood disorders, dementia, behavioral disorders, and adverse events. Some personal studies were also considered. This paper reports the receptor binding profiles and the main mechanism of action of these drugs, together with their main use in psychiatry and the possible adverse events in elderly people.

Chronic risperidone exposure does not show any evidence of bone mass deterioration in animal model of schizophrenia

BACKGROUND

It has been shown that bone mass is centrally regulated. Thus schizophrenia being a disease of the central nervous system is an interesting model for studying bone. Most second generation antipsychotic drugs including risperidone are used in the treatment of schizophrenia. Weight gain and metabolic disturbances are common side effects.

OBJECTIVE

The aims of this study were to investigate bone mass, body composition and light microscopic pathology examinations of femur in an animal model of schizophrenia (pharmacologically induced by postnatally administered phencyclidine-PCP) and to further examine the effects of chronic treatment with risperidone on these parameters in rats.

METHODS

Four groups of male rats were studied:1) control group-NaCl postnatally administered, n=9; 2) PCP group-postnatal PCP administration to rat pups (on day 2,6,9 and 12), n=6; 3) risperidone group-rats treated with risperidone alone for 9weeks from day 35 (NaCl-RSP group, n=7); 4) PCP rats treated with risperidone for 9weeks from day 35 (PCP-RSP group, n=7). Bone mass and body composition were measured in vivo by dual X ray absorptiometry (areal DXA and fat mass). Light microscopic analysis of the femoral metaphysis was performed in all groups after sacrificing the animals.

RESULTS

Postnatal phencyclidine (PCP) administration to rat pups caused a long lasting reduction of total bone mass versus control animals (aDXA 128±2mg/cm(2) vs 139±5mg/cm(2), p<0.05). Examination of the femoral bone revealed a decrease in the number and thickness of the metaphyseal trabecule and cortical thinning. There was a decrease in total and retroperitoneal fat. Nine weeks of administration of risperidone alone to rats, resulted in significant weight gain and had no effect on bone mass versus control animals (aDXA was 136±7mg/cm(2) vs 139±5mg/cm(2), p>0.05). Furthermore, there were no changes in the light microscopic analysis of femoral metaphysis in comparison with controls. When PCP rats were treated with risperidone, they did not change their body weight nor bone mass versus PCP alone (aDXA 126±2mg/cm(2) vs 128±2mg/cm(2), p>0.05) but intriguingly on examination of the femoral bone an increase in the number and thickness of the metaphyseal trabecule was found (trabecular thickness 0.6±0.1μm vs 0.35±0.1μm, p<0.01).

CONCLUSION

This study shows that in the PCP rat model of schizophrenia bone mass is reduced. When PCP rats were treated with risperidone bone mass remained unchanged but intriguingly and unexpectedly light microscopic examination of femoral metaphysis showed an increase in thickness of metaphyseal trabeculae. The mechanism of risperidone's action on bone remains to be clarified.

Risperidone long-acting injection: safety and efficacy in elderly patients with schizophrenia

Antipsychotic medication is considered the cornerstone of the treatment in elderly patients with schizophrenia. Long acting risperidone injection was the first antipsychotic available for use in this group of patients. Current scientific literature revealed that long-acting risperidone is effective in treating the positive and negative symptoms of schizophrenia and some improvements in cognition and functioning have also been found. In terms of efficacy, there is a paucity of randomized trials but the studies suggest that long-acting risperidone is efficient in the long-term management of schizophrenia, with a safety profile similar to that of oral risperidone. It seems that patient acceptance of treatment is greater when patients are switched from a traditional oral medication to depot risperidone and some improvements in cognition and functioning might be related. Further long-term comparisons with other oral and long-acting antipsychotic medications are needed. These studies should include cost-effectiveness data. Research into metabolic side effects is also needed.

Bone remodeling, bone mass and weight gain in patients with stabilized schizophrenia in real-life conditions treated with long-acting injectable risperidone

BACKGROUND

Prolactin-raising antipsychotics, risperidone (antidopaminergic activity), may be associated with low bone mass. On the other hand, risperidone may cause an increase in body weight thought to be favorable for bone.

OBJECTIVES

(1) To determine bone remodeling parameters and bone mass in patients with schizophrenia on long-term treatment with long-acting injectable risperidone (LAIR) in naturalistic settings, and (2) to evaluate the change in body weight, metabolic profile and neuroendocrine status in these patients.

DESIGN

This was a prospective, cross-sectional study.

PATIENTS

Patients included 26 outpatients with controlled schizophrenia in real-life conditions (age 31.3 ± 1.3 years, BMI 28.1 ± 1.0) on long-term maintenance therapy with LAIR for a mean of 18.0 ± 1.6 months (range 6-36) with a mean dose of 38 ± 2 mg. 35 subjects matched for sex, age, BMI and education served as healthy controls.

METHODS

Serum osteocalcin, C-terminal telopeptide of type I collagen (CTx), vitamin D, leptin, prolactin, sex steroids, and parathyroid hormone were assessed. Indices of insulin sensitivity and resistance were determined following an oral glucose tolerance test (OGTT). Bone mineral density (BMD) was measured by dual X-ray absorptiometry at the lumbar spine (LS) and femoral neck (FN).

RESULTS

Mild to moderate hyperprolactinemia (1,000-2,000 mU/l) was associated with asymptomatic hypogonadism. Prolactin values >2,000 mU/l occurred in a few female patients. Hypogonadism leads to a slight increase (upper limit of normal) in bone resorption marker (CTx) in patients with schizophrenia (p = 0.023). As for bone mass, although lower at the spine than in healthy subjects, it did not reach statistical significance (p = 0.094), while at the FN, BMD was not different from healthy subjects. Body weight increased on average 8.7 ± 1.6 kg in more than 50% of patients. Leptin levels adjusted for BMI in females were significantly higher in patients than in healthy female subjects (p = 0.018), while in males there was no difference between the groups (p = 0.833). A high prevalence of low vitamin D levels and more current smokers were found in patients with schizophrenia. As for the metabolic profile during treatment with risperidone, the low Matsuda index of insulin sensitivity (p = 0.039) confirmed insulin resistance in these patients.

CONCLUSION

A potential long-term consequence of asymptomatic hypogonadism due to risperidone-induced hyperprolactinemia might cause a slight rise in bone resorption marker (CTx). On the other hand, by increasing body weight, risperidone could have a protective effect on the bone and thus no change in bone mass was recorded when compared with healthy controls.

Emerging treatments in the management of bipolar disorder - focus on risperidone long acting injection

Bipolar disorder is a life-long psychiatric illness characterized by a high frequency of relapses and substantial societal costs. Almost half of the patients are prescribed second generation antipsychotics for treatment of manic states, or as the maintenance therapy. Risperidone long acting injection (RLAI) as a monotherapy or as adjunctive therapy to lithium or valproate for the maintenance treatment of bipolar I disorder was approved by Food and Drug Administration (FDA) in United States in May 2009. In this review we will consider the aspects of pharmacology, pharmacokinetics, metabolism, safety and tolerability, and clinical trials focusing on the efficacy of RLAI in bipolar disorder. The patients' perspective and attitudes to long-acting injections will also be discussed.