MethodsLongitudinal retrospective study of monhtly risperidone users in a mental health center in the Autonomous Community of Madrid (Spain), between September 2022 and September 2023.
A sample of 13 patients was selected, collecting both sociodemographic (age, gender) and clinical variables (diagnosis, dose, time elapsed, number of hospital readmissions, adverse effects and monotherapy or combined use). A descriptive analysis of the collected data was then carried out.
ResultsMonthly risperidone was used in 13 patients: 15% (n=2) were women, and 85% (n=11) were male. The mean age of the patients was 43.6 years. The most frequent diganosis of these patients was “psychotic disorders” (84,6%, n= 11), with other diagnoses such as schizoaffective disorder (7,7%, n=1) and obsessive compulsive disorder (7,7%, n=1).
The doses used of risperidone were 100mg every month in 61,5% of patients (n=8) and 75mg in 38,5% of patients (n=5). The mean time since the first administration was 4.35 months.
Concerning monotherapy, 84,6% (n=11) of patients on monthly risperidone were on antipsychotic monotherapy, while 15,4% (n=2) required more than one antipsychotic. Among the switches made to monthly risperidone, 69,2% (n=9) were previously treated with oral risperidone, 15,4% (n=2) were treated with once-biweekly risperidone long-acting injectable, 7,9% (n=1) with oral paliperidone and 7,9% with aripiprazole monthly injectable.
During the study period, hospital readmissions for psychiatric descompensations occurred in one patient (7,9%, n=1), while the rest of the patients (92,1%, n=12) did not present decompensations that required psychiatric admission.
Moderate or severe effects occurred in one patient (7,9%, n=1), in the form of acute dystonia, which led to the interruption of injectable treatment. The rest of the patients (92,1%, n=12)) did not present severe adverse effects. Minor adverse effects appeared in 3 patients (25%); these adverse effects were already present in the previous treatment with oral risperidone and did not condition the suspension of the treatment.
ConclusionsIn the sample analyzed, once-monthly Risperidone ISM had reasonable tolerance levels. Also, it´s shown to be effective in preventing psychotic decompensations and hospital admissions.
Therefore, this new injectable of monthly risperidone represents a therapeutic alternative to consider in order to guarantee therapeutic adherence and improve the quality of life of patients with psychotic symptoms.