Aim: To study the effect of the CYP2D6*4 polymorphism on serum sodium concentration in users of antidepressants [selective serotonin reuptake inhibitors and tricyclic antidepressants (TCAs)].
Methods: In this population-based cohort study, all subjects in the Rotterdam Study were included who used an antidepressant at baseline and from whom a blood sample was available in which CYP2D6 genotype and serum sodium concentration could be determined (n= 76). Multivariate linear regression was used to study the association between CYP2D6*4 and serum sodium concentration.
Results: CYP2D6 poor metabolizers (PMs) (*4/*4) had a significantly lower mean serum sodium concentration in comparison with CYP2D6 extensive metabolizers (EMs) (*1/*1) [difference -3.9 mmol l(-1); 95% confidence interval (CI) -0.86, -7.03; P= 0.013]. In CYP2D6*4 heterozygotes (*1/*4) serum sodium concentration was 1.7 mmol l(-1) (95% CI -3.48, 0.18) lower compared with CYP2D6 EMs, but this difference was not statistically significant (P= 0.077).
Conclusions: The serum sodium concentration in PMs was lower in users of an antidepressant, especially in TCA users. Therefore CYP2D6 PMs might be at increased risk of developing symptoms of hyponatraemia.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2767286 | PMC |
| http://dx.doi.org/10.1111/j.1365-2125.2009.03448.x | DOI Listing |
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