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Evaluation of Defined Daily Dose, percentage of British National Formulary maximum and chlorpromazine equivalents in antipsychotic drug utilization

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Tue, 2014-06-24 13:41 — Professor Waleed M. Sweileh
Journal Title, Volume, Page: 
Saudi Pharmaceutical Journal Volume 22, Issue 2, April 2014, Pages 127–132
Year of Publication: 
2014
Link: 
http://www.sciencedirect.com/science/article/pii/S1319016413000352
Authors: 
Waleed M. SweilehCorresponding author contact information, E-mail the corresponding author, E-mail the corresponding author, Jihad Bani Odeh, Naser Y. Shraim, Sa’ed H. Zyoud, Ansam F. Sawalha, Samah W. Al-Jabi
Preferred Abstract (Original): 
  • Waleed M. SweilehCorresponding author contact information, E-mail the corresponding author, E-mail the corresponding author, 
  • Jihad Bani Odeh, 
  • Naser Y. Shraim, 
  • Sa’ed H. Zyoud, 
  • Ansam F. Sawalha,
  • Samah W. Al-Jabi

    • Objective

      The present study was carried out to investigate and compare the three methods for calculating total antipsychotic dose among outpatients with schizophrenia attending primary psychiatric health care centers. The three methods were: Defined Daily Doses (DDDs), chlorpromazine equivalents (CPZeq) and percentages of the British National Formulary (BNF) maximum.

      Methodology

      Antipsychotic drug dosing data for 250 patients with schizophrenia were investigated by calculating Spearman’s rank correlation coefficients. Factors associated with antipsychotic dose, expressed as DDDs, CPZeq and percentages of the BNF maximum recommended daily dose, were investigated by means of linear regression analysis.

      Results

      Spearman’s correlation showed that there is a significant relationship between all pairs of the three dosing methods. In all three methods, coherence was strongest when dealing with first generation antipsychotics (FGA). Linear regression analyses showed a high degree of coherence between antipsychotic doses expressed as DDDs, CPZeq and percentages of the BNF maximum recommended daily dose.

      Conclusion

      All three tested methods are reliable and coherent for calculating antipsychotic dosing.

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