Dizziness, drowsiness, fatigue, nausea, vomiting, headache, trouble sleeping, acne, dry mouth, or constipation may occur. If any of these effects persist or worsen, contact 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. Tell your doctor immediately if you develop any of these serious side effects: double vision, change in vision, involuntary eye movements, difficulty speaking, difficulty concentrating, loss of coordination, trouble walking (abnormal gait), uncontrolled muscle movements (tremor), dulled sense of touch. Tell your doctor immediately if you develop any of these unlikely but very serious side effects: easy bleeding/bruising, chest pain, persistent sore throat, stomach/abdominal pain, bloody stool, dark urine, change in amount of urine, yellowing of eyes/skin. 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 immediately 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. A serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include: fever, rash, itching/swelling (especially of the face/tongue/throat/lymph nodes), 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. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.