Side effects range from mild to serious. Consult your doctor if you feel the following symptoms: Stomach/abdominal cramping occur usually within the first several hours after taking this medication, Nausea, loss of appetite, heartburn, and headache may also occur, eye redness/pain, hair loss, numbness/tingling of arms/legs, mouth/lip/throat sores (stomatitis). Mettallic taste may be the first sign of stomatitis; signs of low blood count (e.g., fast/pounding heartbeat, pale skin, unusual tiredness), easy bleeding/bruising, black/bloody stools, persistent cough, mucus/pus/blood in watery diarrhea, difficult/painful breathing, dizziness, signs of infection (e.g., fever, persistent sore throat), severe stomach/abdominal pain, unusual tiredness, change in the amount/color of urine, vomit that looks like coffee grounds, yellowing eyes/skin.
Contact your doctor if you experience allergic reactions (rash, itching, swelling of the face/throat, trouble breathing) or symptoms mentioned above.