How long it takes for rituximab to work varies from person to person. According to the drug’s instructions, when it is used to treat lymphoma, it is usually given as a 21-day course of treatment, and eight courses of treatment are recommended. It usually works after one course of treatment. Rituximab, usually referred to as rituximab injection, is a monoclonal antibody that binds to antigens in the body to treat disease. It is mainly used to treat relapsed or drug-resistant follicular central lymphoma, and should be used as prescribed by your doctor. The specific onset of action of the drug has individual differences, and is related to the patient’s age, gender, physical fitness, as well as the combination of drugs and so on. Therefore, how long it takes for rituximab to work cannot be generalized. Rituximab should not be used in patients with protein allergies, and is contraindicated in patients with severely reduced resistance and severe heart failure. Therefore, before using it, it needs to be used by professionals under the advice of a doctor, and should not be abused blindly. At the same time, the adverse effects of the drug should be closely observed during use, such as secondary infection, angioedema, anemia, sensory abnormalities and so on.