Recommended Dose The recommended dose of pirtobrutinib is 200 mg orally once daily, until disease progression or unacceptable toxicity occurs. Swallow the tablets whole with water. Do not cut, crush, or chew the tablets. Take pirtobrutinib at approximately the same time every day, with or without food. If a dose of pirtobrutinib is missed by more than 12 hours, do not make up the missed dose and take the next dose as scheduled. Dose Adjustment for Adverse Reactions Recommended dose adjustments for pirtobrutinib adverse reactions are shown in Table 1. Table 1: Dose Adjustments for Pirtobrutinib Adverse Reactions (Initial dose: 200 mg once daily) Situations Requiring Dose Adjustment Dose Modification Grade 3 or higher non-hematologic toxicitya Absolute neutrophil count (ANC) < 1×10⁹/L and ≥ 0.5×10⁹/L with fever and/or infection ANC < 0.5×10⁹/L lasting for 7 days or longer Platelet count < 50×10⁹/L and ≥ 25×10⁹/L with bleeding Platelet count < 25×10⁹/L First occurrence: Withhold pirtobrutinib until recovery to Grade 1 or baseline; then restart at the initial dose (200 mg once daily). Second occurrence: Withhold pirtobrutinib until recovery to Grade 1 or baseline; then restart at 100 mg once daily. Third occurrence: Withhold pirtobrutinib until recovery to Grade 1 or baseline; then restart at 50 mg once daily. Fourth occurrence: Discontinue pirtobrutinib permanently. a For Grade 4 non-hematologic toxicity, evaluate the benefit-risk profile before resuming treatment at the same dose.
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