Influence of CYP2D6*4 polymorphism on the outcome of treatment with serotonergic drugs. Role of community pharmacy in its optimization

Authors

  • Belén García Sánchez Estudiante de farmacia
  • María Jesús Rodríguez Arcas Farmacéutica Titular, Cartagena, Murcia, España.
  • Juana María Ortiz Sánchez Profesora Titular, Universidad de Murcia, Facultad de Medicina, Departamento de Sanidad Animal, Murcia, España
  • Pablo Conesa Zamora Departamento de Patología, Grupo de Patología Molecular y Farmacogenética, Hospital General Universitario Santa Lucía, Cartagena, España.

DOI:

https://doi.org/10.60103/phc.v26.e841

Keywords:

Serotonin Agents; Cytochrome P-450 CYP2D6; Drug Metabolism, Poor, CYP2D6-Related; pharmacogenetic; community pharmacy

Abstract

Introduction: Genetic polymorphisms in hepatic metabolizing enzymes are one of the main reasons for interindividual differences in response to drugs. Most serotonergic medications are metabolized by the CYP2D6 isoform of CYP450, therefore, variations in the sequence of the gene that codes for this enzyme and, specifically, the genetic identification of the CYP2D6*4 variant can help us predict the response. The objective of the study is to relate the treatment effectiveness, safety and adherence of patients treated with serotonergics drugs with the different genotypes responsible for the normal metabolizer (NM), intermediate metabolizer (IM) and poor metabolizer (PM) phenotypes.

Method: A quasi-experimental study was carried out from the community pharmacy. The principal investigator made the service offer and carried out an initial interview where he obtained information about the patient's clinical parameters and health problems. Afterwards, a saliva sample was taken and subsequently genotyped at the hospital using an allele-specific competitive Polymerase Chain Reaction (PCR). Subsequently, the patient's health problems were related to the medication on a specific date and the patient's clinical situation was contrasted with the existing scientific evidence. Finally, Medication-Related Problems (PRM) and Negative Outcomes associated with Medication (RNM) are identified.

Results and conclusions: Twenty-three patients were interviewed, only 4 obtained the IM phenotype, while the rest were NM. Patients phenotyped as IM had greater effectiveness of serotonergic treatment – probably due to a high drug concentration – and greater adherence to treatment than NM patients. However, they showed more Medication-Associated Negative Outcomes (RNM), especially dose-dependent ones. Even so, the evidenced influence of the genetic polymorphism on the response to serotonergic treatment makes us recommend its inclusion in the FORO AF-FC classification as a new Medication-Related Problem (PRM). In any case, given the small sample size, the results were not statistically significant. More research is required to reach firm conclusions.

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Published

2024-05-23

How to Cite

García Sánchez, B., Rodríguez Arcas, M. J., Ortiz Sánchez, J. M., & Conesa Zamora, P. (2024). Influence of CYP2D6*4 polymorphism on the outcome of treatment with serotonergic drugs. Role of community pharmacy in its optimization. Pharmaceutical Care España, 26. https://doi.org/10.60103/phc.v26.e841

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Originales