SIDE EFFECTS that may occur while taking this medicine include abnormal skin sensations; diarrhea; dizziness; drowsiness; flu-like symptoms; headache; irritability; loss of appetite; nausea; stomach upset; tiredness; trouble sleeping; or vomiting. If they continue or are bothersome, check with your doctor. THIS MEDICINE MAY CAUSE HIGH BLOOD ACID LEVELS (metabolic acidosis). The risk may be greater in children and in patients with kidney problems, status epilepticus, severe breathing problems, or diarrhea. It may also be greater in patients who are taking certain other medicines (eg, acetazolamide), will be having surgery, or are on a ketogenic diet. Contact your doctor immediately if you experience fast breathing, unusual weakness or fatigue, sluggishness, fainting, persistent loss of appetite, or irregular heartbeat. CONTACT YOUR DOCTOR IMMEDIATELY if you experience bone pain; changes in the amount of urine produced; confusion; dark or bloody urine; decreased sweating; double vision or other vision problems; fainting; fast breathing; fast, slow, or irregular heartbeat; fever, cough, chills, or sore throat; loss of coordination; memory problems; new or worsening mental or mood changes (eg, agitation, depression, anxiety, panic attacks, aggressiveness, impulsiveness, irritability, hostility, exaggerated feeling of well-being, restlessness, inability to sit still); new or worsening seizures; mouth sores; painful urination; persistent loss of appetite; red, swollen, blistered, or peeling skin; severe muscle pain or weakness; severe or persistent drowsiness; sluggishness; sudden stomach or back pain; suicidal thoughts or actions; swelling of the hands, ankles, or feet; tremor; trouble speaking or other speech problems; trouble thinking or concentrating; unusual bruising or bleeding; unusual eye movements; unusual or disturbing thoughts; or unusual tiredness or weakness. AN ALLERGIC REACTION to this medicine is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue. This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.