 <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]  headache, nausea, and sores in the mouth/throat may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. People using this medication may have serious side effects. However, you have been prescribed this drug because your doctor has judged that the benefit to you is greater than the risk of side effects. Careful monitoring by your doctor may decrease your risk. Tell your doctor right away if you have any serious side effects, including: swelling hands/ankles/feet, wound problems (such as infection, slow wound healing, opening of wound), decreased sexual ability (in men), chest pain/pressure, shortness of breath, unusual bruising/bleeding. This medication may make side effects from radiation treatment worse. These side effects can sometimes be severe. Tell your doctor if you have had or are planning to have radiation treatment. This medication has caused very serious (rarely fatal) lung problems. Get medical help right away if you have symptoms of lung problems, such as shortness of breath, chest pain. This medication may increase your risk of getting a rare but very serious (sometimes fatal) brain infection (progressive multifocal leukoencephalopathy-PML). Get medical help right away if any of these </s>