{"6-mercaptopurine can be affected by a patient's TPMT and NUDT15 phenotype. This patient is predicted to be possible TPMT intermediate metabolizer and NUDT15 intermediate metabolizer. This patient is at risk for myelosuppression with normal doses of 6-mercaptopurine. Start with reduced starting doses (20%-50% of normal dose) if normal starting dose is ≥ 75 mg/m2/day or ≥ 1.5 mg/kg/day (e.g., start at 15-37.5 mg/m2/day or 0.3-0.75 mg/kg/day) and adjust doses of mercaptopurine based on degree of myelosuppression and disease-specific guidelines. At least 2-4 weeks will be required to reach steady-state after each dose adjustment. If myelosuppression occurs, and depending on other therapy, emphasis should be on reducing mercaptopurine over other agents. If normal starting dose is already < 37.5 mg/m2/day or < 0.75 mg/kg/day, dose reduction may not be recommended. Please consult a clinical pharmacist for more information."}