This addendum to the guideline on the use of pharmacogenetic methodologies in the pharmacokinetic evaluation of medicinal products (EMA/CHMP/37646/2009) intends to provide clear definitions of terms used for metabolic phenotyping, as well to propose concepts regarding the translation of genotypes into the predicted metabolic phenotype, of significant importance for the correct treatment of patients.
Keywords: Phenotype, genotype, methodologies, pharmacokinetics, metabolism