This result signifies that the patient has one copy of a decreased function allele and one copy of a no function allele. Based on the genotype result this patient MAY be a poor metabolizer of CYP2C19 substrates. This patient may be at a high risk for an adverse or poor response to medications that are metabolized by CYP2C19. To avoid an untoward drug response, dose adjustments or or alternative therapy may be necessary for medications metabolized by the CYP2C19. Please consult a clinical pharmacist for more information about how CYP2C19 metabolic status influences drug selection and dosing.