{"Thioguanine can be affected by a patient's TPMT and NUDT15 phenotype. This patient is predicted to be a TPMT poor metabolizer and is at high risk for life threatening myelosuppression with normal doses of thioguanine and should receive greatly reduced doses. Start with drastically reduced doses (reduce daily dose by 10 fold and dose thrice weekly instead of daily) and adjust doses of thioguanine based on degree of myelosuppression and disease-specific guidelines. Allow 4-6 weeks to reach steady-state after each dose adjustment. If myelosuppression occurs, emphasis should be on reducing thioguanine over other agents. For non-malignant conditions, consider alternative non-thiopurine immunosuppressant therapy. However, NUDT15 phenotype could not be assigned based on genotyping. Monitor closely for toxicity. Please consult a clinical pharmacist for more information."}