When used to treat non-Hodgkin’ s lymphoma, the most common side effects with MabThera (seen in more than 1 patient in 10) are bacterial infections, viral infections, bronchitis (inflammation of the airways in the lungs), neutropenia (low levels of neutrophils, a type of white blood cell), leucopenia (low levels of leucocytes, another type of white blood cell), febrile neutropenia (neutropenia with fever), reactions related to the infusion (mainly fever, chills and shivering), angioedema (swelling beneath the skin), nausea (feeling sick), pruritus (itching), rash, alopecia (hair loss), fever, chills, asthenia (weakness), headache and decreased levels of IgG (a type of antibody).