{"Thioguanine can be affected by a patient's TPMT and NUDT15 phenotype. This patient is predicted to be a TPMT intermediate metabolizer and NUDT15 poor metabolizer. This patient is at high risk for life threatening myelosuppression with normal doses of thioguanine and should receive drastically reduced doses. Reduce daily dose by 10-fold (~90% dose reduction) and reduce frequency to 3 times per week instead of daily. During therapy, adjust thioguanine doses based on degree of myelosuppression and disease-specific guidelines. It usually takes at least 4-6 weeks of stable dosing to reach steady state after each dose adjustment. If myelosuppression occurs, emphasis should be on reducing thioguanine over other agents. Please consult a clinical pharmacist for more information."}