This result signifies that the patient has two copies of a no function allele OR two copies of a decreased function allele OR one copy of a no function allele and one copy of a decreased function allele. Based on the genotype result this patient is predicted to be a poor metabolizer of CYP2B6 substrates. This patient may be at risk for an adverse or poor response to medications that are metabolized by CYP2B6. To avoid an untoward drug response, dose adjustments or or alternative therapy may be necessary for medications metabolized by CYP2B6. Please consult a clinical pharmacist for more information about how CYP2B6 metabolic status influences drug selection and dosing.