In a female fertility and early embryonic development study, female rats were administered daily intravenous doses of inotuzumab ozogamicin up to 0.11 mg/m2 for 2 weeks before mating through Day 7 of pregnancy. An increase in the proportion of resorptions and decrease in the number of viable embryos and gravid uterine weights were observed at the 0.11 mg/m2 dose level (approximately 2 times the exposure in patients at the maximum recommended dose, based on AUC). Additional findings in female reproductive organs occurred in repeat-dose toxicology studies and included decreased ovarian and uterine weights, and ovarian and uterine atrophy. Findings in male reproductive organs occurred in repeat-dose toxicology studies and included decreased testicular weights, testicular degeneration, hypospermia, and prostatic and seminal vesicle atrophy. Testicular degeneration and hypospermia were nonreversible following a 4-week nondosing period. In the chronic studies of 26-weeks duration, adverse effects on reproductive organs occurred at ≥0.07 mg/m2 in male rats and at 0.73 mg/m2 in female monkeys [see ].. Besponsa is indicated for the treatment of adults with relapsed or refractory B-cell precursor acute lymphoblastic leukemia (ALL). 2. DOSAGE AND ADMINISTRATION Recommended Dosage. Pre-medicate before each dose [see Dosage and Administration (2.2)].. The Food and Drug Administration approved BESPONSA based on the results of the clinical trial that showed treatment with BESPONSA compared to chemotherapy improved complete remission (CR) rates (36% vs 17%), length of CR (8.0 months vs 4.9 months), and minimal residual disease–negative CR rates (90% vs 32%)..