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PLoS One. 2015 Oct 1;10(10):e0139403. doi: 10.1371/journal.pone.0139403. eCollection 2015.

A Non-Interventional Naturalistic Study of the Prescription Patterns of Antipsychotics in Patients with Schizophrenia from the Spanish Province of Tarragona.

Author information

1
Hospital Universitari Institut Pere Mata, Universitat Rovira i Virgili, CIBERSAM, IISPV Reus, Spain.
2
Hospital Universitari Institut Pere Mata, Reus, Spain.

Abstract

BACKGROUND:

The analysis of prescribing patterns in entire catchment areas contributes to global mapping of the use of antipsychotics and may improve treatment outcomes.

OBJECTIVE:

To determine the pattern of long-term antipsychotic prescription in outpatients with schizophrenia in the province of Tarragona (Catalonia-Spain).

METHODS:

A naturalistic, observational, retrospective, non-interventional study based on the analysis of registries of computerized medical records from an anonymized database of 1,765 patients with schizophrenia treated between 2011 and 2013.

RESULTS:

The most used antipsychotic was risperidone, identified in 463 (26.3%) patients, followed by olanzapine in 249 (14.1%), paliperidone in 225 (12.7%), zuclopenthixol in 201 (11.4%), quetiapine in 141 (8%), aripiprazole in 100 (5.7%), and clozapine in 100 (5.7%). Almost 8 out of 10 patients (79.3%) were treated with atypical or second-generation antipsychotics. Long-acting injectable (LAI) formulations were used in 44.8% of patients. Antipsychotics were generally prescribed in their recommended doses, with clozapine, ziprasidone, LAI paliperidone, and LAI risperidone being prescribed at the higher end of their therapeutic ranges. Almost 7 out of 10 patients (69.6%) were on antipsychotic polypharmacy, and 81.4% were on psychiatric medications aside from antipsychotics. Being prescribed quetiapine (OR 14.24, 95% CI 4.94-40.97), LAI (OR 9.99, 95% CI 6.45-15.45), psychiatric co-medications (OR 4.25, 95% CI 2.72-6.64), and paliperidone (OR 3.13, 95% CI 1.23-7.92) were all associated with an increased likelihood of polypharmacy. Being prescribed risperidone (OR 0.54, 95% CI 0.35-0.83) and older age (OR 0.98, 95% CI 0.97-0.99) were related to a low polypharmacy probability.

CONCLUSIONS:

Polypharmacy is the most common pattern of antipsychotic use in this region of Spain. Use of atypical antipsychotics is extensive. Most patients receive psychiatric co-medications such as anxiolytics or antidepressants. Polypharmacy is associated with the use of quetiapine or paliperidone, use of a LAI, younger age, and psychiatric co-medication.

PMID:
26427051
PMCID:
PMC4591292
DOI:
10.1371/journal.pone.0139403
[Indexed for MEDLINE]
Free PMC Article

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