Neuroleptic malignant syndrome associated with risperidone long-acting injection: a case report

Neuroleptic malignant syndrome associated with long-acting injectable versus oral second-generation antipsychotics: Analyses based on a spontaneous reporting system database in Japan

Long-acting injectable antipsychotics (LAI-APs) remain underutilized. One reason is the concern that LAI-APs might cause serious adverse events such as neuroleptic malignant syndrome (NMS) and lead to prolonged symptoms compared with oral treatment. Because the risk of NMS associated with LAI second-generation antipsychotics (LAI-SGAs) remains unclear, we compared reporting frequency, time to onset, and mortality of NMS between LAI- and oral SGAs using data from a Japanese spontaneous adverse event reporting database between April 2004 and September 2019. Of 5791 patients reporting adverse events due to LAI-SGAs or the equivalent oral SGAs, 768 (13%) developed NMS. LAI aripiprazole and LAI paliperidone were associated with a significantly lower reporting frequency of NMS than the equivalent oral SGAs (adjusted reporting odds ratio [95% confidence interval]: 0.35 [0.19-0.63] and 0.40 [0.27-0.59], respectively). Between 42% and 62% of the NMS associated with LAI- and oral SGAs other than LAI risperidone occurred within 30 days after initiation. The proportion of mortality due to NMS associated with oral aripiprazole was 13.1% and no deaths occurred in patients with NMS associated with LAI aripiprazole. The proportions of mortality due to NMS associated with oral risperidone/paliperidone, LAI risperidone, and LAI paliperidone were 8.8%, 4.2%, and 3.4%, respectively. Our findings showed that LAI-SGAs were not associated with a higher reporting frequency and mortality of NMS compared with oral SGAs, although clinicians need to closely monitor the occurrence of NMS not only during oral SGA treatment, but also, and in particular, in the early stage of LAI-SGA treatment.

Systematic review of case reports of oropharyngeal dysphagia following the use of antipsychotics

OBJECTIVE

The purpose of this systematic review was to examine the effect of antipsychotic medication on dysphagia based on clinical case reports.

PATIENTS AND METHODS

Literature searches were performed using the electronic databases PubMed and Embase. In PubMed, we used the MeSH terms "antipsychotic agents" OR "tranquilizing agents" combined with "deglutition disorders" OR "deglutition". In Embase, we used the Emtree terms "neuroleptic agents" combined with "swallowing" OR "dysphagia". Two reviewers assessed the eligibility of each case independently.

RESULTS

A total of 1043 abstracts were retrieved, of which 36 cases met the inclusion criteria; 14 cases were related to typical antipsychotics and 22 to atypical antipsychotics. Dysphagia occurred together with extrapyramidal symptoms in half of the cases and was the only prominent symptom in the other half. The most common strategy against dysphagia was changing to another antipsychotic (n=13, 36.1%).

CONCLUSIONS

The data from this review indicate that antipsychotics can increase the prevalence of dysphagia.

Efficacy and tolerability of aripiprazole once monthly for schizophrenia: a systematic review and meta-analysis of randomized controlled trials

OBJECTIVE

We conducted a systematic review and meta-analysis of the efficacy of aripiprazole once monthly (AOM) for schizophrenia.

METHODS

Randomized controlled trials (RCTs) on AOM, published until June 25, 2015, were retrieved from PubMed, Cochrane, and PsycINFO databases. Relative risk (RR), standardized mean difference (SMD), 95% confidence intervals (95% CIs), and numbers needed to treat/harm (NNT/NNH) were calculated.

RESULTS

We identified four relevant RCTs (total n=1,860), two placebo-controlled trials, one noninferiority trial comparing AOM to oral aripiprazole (OA), and one including therapeutic doses of AOM and OA, as well as an AOM dose below therapeutic threshold (control arm). AOM was superior to placebo for decreasing Positive and Negative Syndrome Scale (PANSS) total scores (SMD =-0.65, 95% CI =-0.90 to -0.41, n=1,126). However, PANSS total scores did not differ significantly between pooled AOM and OA groups. The pooled AOM group showed significantly lower incidence of all-cause discontinuation (RR =0.54, 95% CI =0.41-0.71, n=1,139, NNH =4) and inefficacy (RR =0.28, 95% CI =0.21-0.38, n=1,139, NNH =5) than placebo, but was not superior to placebo regarding discontinuation due to adverse events (AEs) or death. The AOM group exhibited a lower incidence of all-cause discontinuation than OA (RR =0.78, 95% CI =0.64-0.95, n=986, NNH =14), but there were no intergroup differences in discontinuation due to inefficacy, AEs, or death. There were no significant differences in extrapyramidal symptoms scale scores between AOM and placebo or between AOM and OA. AOM resulted in higher weight gain than placebo (SMD =0.41, 95% CI =0.18-0.64, n=734) but lower than OA (SMD =-0.16, 95% CI =-0.29 to -0.02, n=847).

CONCLUSION

AOM has antipsychotic efficacy and low risk of discontinuation due to AEs.

ISMP Adverse Drug Reactions

The purpose of this feature is to heighten awareness of specific adverse drug reactions (ADRs), discuss methods of prevention, and promote reporting of ADRs to the US Food and Drug Administration's (FDA's) MedWatch program (800-FDA-1088). If you have reported an interesting, preventable ADR to MedWatch, please consider sharing the account with our readers. Write to Dr. Mancano at ISMP, 200 Lakeside Drive, Suite 200, Horsham, PA 19044 (phone: 215-707-4936; e-mail: mmancano@temple.edu). Your report will be published anonymously unless otherwise requested. This feature is provided by the Institute for Safe Medication Practices (ISMP) in cooperation with the FDA's MedWatch program and Temple University School of Pharmacy. ISMP is an FDA MedWatch partner.