Evaluation of adherence to antipsychotics: A real-world data study using four different dosing assumptions.

Br J Clin Pharmacol

Health Technology Assessment in Primary Care and Mental Health (PRISMA) Research Group, Teaching, Research & Innovation Unit, Parc Sanitari Sant Joan de Déu, Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, Spain.

Published: June 2024

AI Article Synopsis

  • This study investigated how often there are inconsistencies in antipsychotic dosing within prescription data and how different strategies for handling these inconsistencies impact adherence estimates.
  • It used data from 2015-2019, focusing on adult patients in Catalonia who received at least one antipsychotic prescription and analyzed four dosing strategies for assessing medication adherence.
  • The study found that, despite a high rate of overlapping prescriptions, the different strategies did not significantly affect overall adherence rates; however, the strategy of selecting the highest dose provided a more accurate adherence estimate.

Article Abstract

Aims: This study aimed to assess the frequency of dosing inconsistencies in prescription data and the effect of four dosing assumption strategies on adherence estimates for antipsychotic treatment.

Methods: A retrospective cohort, which linked prescription and dispensing data of adult patients with ≥1 antipsychotic prescription between 2015-2016 and followed up until 2019, in Catalonia (Spain). Four strategies were proposed for selecting the recommended dosing in overlapping prescription periods for the same patient and antipsychotic drug: (i) the minimum dosing prescribed; (ii) the dose corresponding to the latest prescription issued; (iii) the highest dosing prescribed; and (iv) all doses included in the overlapped period. For each strategy, one treatment episode per patient was selected, and the Continuous Medication Availability measure was used to assess adherence. Descriptive statistics were used to describe results by strategy.

Results: Of the 277 324 prescriptions included, 76% overlapped with other prescriptions (40% with different recommended dosing instructions). The number and characteristics of patients and treatment episodes (18 292, 18 303, 18 339 and 18 536, respectively per strategy) were similar across strategies. Mean adherence was similar between strategies, ranging from 57 to 60%. However, the proportion of patients with adherence ≥90% was lower when selecting all doses (28%) compared with the other strategies (35%).

Conclusion: Despite the high prevalence of overlapping prescriptions, the strategies proposed did not show a major effect on the adherence estimates for antipsychotic treatment. Taking into consideration the particularities of antipsychotic prescription practices, selecting the highest dose in the overlapped period seemed to provide a more accurate adherence estimate.

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Source
http://dx.doi.org/10.1111/bcp.16042DOI Listing

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