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Introduction: Preventing side effects is important to ensure optimal psychopharmacotherapy and therapeutic adherence among psychiatric patients. Obtaining the pharmacogenetic profile of CYP2C19 and CYP2D6 can play an important role in this. When the genotype-predicted phenotype shifts because of the use of co-medication, this is called phenoconversion. The aim was to study the influence of the pharmacogenetic (PGx) profile and phenoconversion on side effects experienced by psychiatric patients. Methods: A retrospective cohort study was performed using data from 117 patients from a psychiatric outpatient clinic. Patients were genotyped with a psychiatric PGx panel and side effects were evaluated using the Udvalg for Kliniske Undersølgelser side effects rating scale (UKU). Results: Of all patients, 10.3% and 9.4% underwent phenoconversion (any shift in predicted phenotype) for CYP2C19 and CYP2D6 respectively. No significant associations were found between the phenotype and UKU-score. 75% of the patients with an Intermediate metabolizer (IM) or Poor metabolizer (PM) phenoconverted phenotype of CYP2C19 experienced nausea and vomiting compared to 9.1% of the Normal metabolizer (NM) and Ultrarapid metabolizer (UM) patients (p = 0.033). 64% of the patients with an IM or PM phenoconverted phenotype of CYP2D6 experienced the side effect depression compared to 30.4% NMs and UMs (p = 0.020). CYP2D6 IM and PM patients had a higher concentration-dose ratio than NM patients (p < 0.05). Discussion: This study underlines the importance to consider phenoconversion when looking at a patient's genotype. This is important for a better prediction of the phenotype and preventing possible side effects under a specific psychopharmacotherapy.
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Background Atopic dermatitis affects 10-20% of the children worldwide. Unfortunately not all patients who receive treatment have optimal treatment outcomes. Objective To assess the view of parents and pharmacy staff in order to optimize pharmaceutical care for young atopic dermatitis patients. Setting Community pharmacies in the Netherlands. Method We first held an expert panel meeting to determine experts' views on treatment of atopic dermatitis and their suggestions for areas of improvement. This input was used to develop the interview guide. We conducted telephone interviews with parents of children (aged 0-12 years) with atopic dermatitis and face-to-face interviews with pharmacy staff members. All interviews were audiotaped and transcribed verbatim. Transcripts were coded using qualitative data analysis software. Codes were used to identify themes. Main outcome measure Perspectives of parents of young atopic dermatitis patients and pharmacy staff about treatment. Results We interviewed 29 parents and 18 pharmacy staff members. Many parents mentioned fear of steroid adverse effects, with intentional nonadherence as a consequence, and difficulties with the application of topical treatment. Pharmacy employees also mentioned to encounter these issues. Some employees themselves expressed concerns towards use of steroids. Most parents were satisfied with the information they received; however, they need more practical lifestyle advices, e.g. about bathing or clothing. Both pharmacists and pharmacy technicians mentioned that technicians often lack knowledge to support patients optimally in correct medication use. Conclusion Parents' perceptions about topical corticosteroids might negatively influence treatment outcomes. Pharmacy staff has an important role to inform parents of children with eczema on the appropriate use of topical corticosteroids and emollients. Counseling should not be influenced by their own prejudices about topical corticosteroids. Close collaboration between primary care providers should ensure that parents receive uniform messages.