Common Side Effects of BESPONSA. The most common side effects are low platelet counts (thrombocytopenia), low white blood cell counts with and without fever (neutropenia, febrile neutropenia, and leukopenia), infection, low red blood cell counts (anemia), fatigue, bleeding, fever, nausea, headache, increases in lab tests measuring liver function, and pain in the abdomen.. What are the possible side effects of inotuzumab ozogamicin (Besponsa)? Get emergency medical help if you have signs of an allergic reaction : hives ; difficult breathing; swelling of your face, lips, tongue, or throat.. Common side effects of Besponsa include: low platelet counts (thrombocytopenia), low white blood cell counts (neutropenia, leukopenia), infection, anemia, fatigue, bleeding, fever,. Find patient medical information for Besponsa Intravenous on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings.. . .