The side effects of cyclophosphamide may include gastrointestinal reaction, urinary tract reaction, bone marrow suppression, etc., which can be resolved by stopping the drug, reducing the dosage and applying the drug. 1. Gastrointestinal reaction: nausea, vomiting, loss of appetite and other gastrointestinal reactions may occur when taking cyclophosphamide, which can be disappeared by stopping the drug for 1~3 days, and if the patient is more sensitive, he/she can take metoclopramide and other drugs. 2. Urinary tract reaction: taking cyclophosphamide may appear bladder irritation symptoms, oliguria, hematuria, proteinuria and other urinary tract reaction, usually caused by taking cyclophosphamide overdose, daily use of cyclophosphamide should not be overdose, you can reduce the dose of the drug, drink plenty of water when using the drug. 3. Myelosuppression: Cyclophosphamide may cause leukopenia and other symptoms, which can be recovered slowly after stopping the drug. When taking the drug, you can monitor the level of leukocytes on a regular basis, and if the decrease of leukocytes is more serious, you can promote the rebound of the blood image through the use of leukapheresis injection and other medicines. Cyclophosphamide side effects should be informed to the doctor in a timely manner, in accordance with the doctor’s instructions to deal with, do not stop taking the drug on their own.