Dizziness, drowsiness, tiredness, nausea/vomiting, stomach/abdominal pain, headache, trouble sleeping, or constipation may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because he or she 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. A small number of people who take anticonvulsants for any condition (such as seizure, bipolar disorder, pain) may experience depression, suicidal thoughts/attempts, or other mental/mood problems. Tell your doctor right away if you or your family/caregiver notice any unusual/sudden changes in your mood, thoughts, or behavior including signs of depression, suicidal thoughts/attempts, thoughts about harming yourself. Tell your doctor right away if you have any serious side effects, including: loss of coordination, vision changes (such as double vision), rapid/uncontrollable eye movements, shaking (tremor), easy bleeding/bruising, unusual tiredness. Get medical help right away if you have any very serious side effects, including: signs of infection (such as fever, swollen lymph nodes, sore throat that doesn't go away, cough), symptoms of low sodium level (severe nausea, extreme drowsiness, confusion, seizures). Oxcarbazepine may rarely cause very serious (possibly fatal) skin reactions. Some people in certain ethnic groups (including people of Asian/South Asian descent) are at greater risk. Your doctor may order a blood test to measure your risk before you start this medication. If the blood test shows you are at greater risk, your doctor should discuss the risks and benefits of oxcarbazepine and other treatment choices with you. Such skin reactions have developed mostly within the first few months of treatment. Get medical help right away if you develop symptoms of a serious skin reaction such as skin rash/blisters/peeling, itching, or swelling. Ask your doctor or pharmacist for more details. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.