 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  your body size and your dose of ifosfamide (or cyclophosphamide). While using this medication, drink at least a quart (4 cups or 1 liter) of liquid each day unless directed otherwise by your doctor. Doing so will also help to reduce the bladder side effects from ifosfamide. Mesna is very effective in reducing the risk of hemorrhagic cystitis in most patients. However, it may not work in a small number of patients. Tell your doctor right away if you notice that your urine is pink, red, or bloody.The side effects of Mesnex Intravenous: Headache, redness/pain/swelling at the injection site, flushing, dizziness, drowsiness, nausea, vomiting, loss of appetite, diarrhea, constipation, sensitive skin, or flu-like symptoms (such as sore throat, cough, body aches) may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, </s>