Before using
Warning: rarely, serious (possibly fatal) liver problems have occurred in patients using this drug. Children using this drug who are under the age of 2 years are at higher risk to experience liver problems, especially if they also have a severe seizure disorder along with mental retardation; are using more than one seizure control drug; have body process (metabolic) problems or have brain disorders. If used in these patients, this drug must not be used with additional seizure control drugs. Early signs of liver problems include loss of seizure control, vomiting, unusual tiredness/weakness, loss of appetite, yellowing eyes/skin, or swelling of the face. Contact your doctor promptly if you develop any of these symptoms.
Liver tests should be run before and during use of the drug. Rarely, serious (possibly fatal) pancreatitis (pancreas inflammation) has occurred during use of this medicine. It may progress quickly and may include abdominal pain, nausea, vomiting, and loss of appetite. Contact your doctor promptly if you develop any of these symptoms. Rarely, serious (possibly fatal) encephalopathy (decreased mental status) has occurred during use of this medicine. This has occurred in patients with a specific metabolic disorder (urea cycle disorder). Symptoms may include unusual weakness, vomiting, or mental changes. Contact your doctor promptly if you develop any of these symptoms. This drug may cause birth defects. Consult your doctor about the use of this medicine during pregnancy.
Additional monitoring of your dose or condition may be needed if you are taking barbiturates, benzodiazepines, or other medicine for seizures. Inform your doctor of any other medical conditions, allergies, pregnancy, or breast-feeding. Use of this medicine is not recommended if you have a history of liver conditions, pancreatitis, or certain metabolic disorder (urea cycle disorder). Contact your doctor or pharmacist if you have any questions or concerns about using this medicine.
Directions
Follow the directions for using this medicine provided by your doctor. Swallow whole. Do not break, crush, or chew before swallowing. This medicine may be taken with food if it upsets your stomach. Store this medicine at room temperature, away from heat and light.
If you miss a dose of this medicine and it is within 6 hours of the missed dose, take it as soon as possible. Take the remaining doses of the day at evenly spaced intervals. If you miss a dose of this medicine and you are taking 1 dose daily, take the missed dose if you remember the same day. Skip the missed dose if you do not remember until the next day. Do not take 2 doses at once.
Cautions
This medicine may cause drowsiness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to this medicine. This medicine will add to the effects of alcohol and other depressants. Ask your pharmacist if you have questions about which medicines are depressants. Before you begin taking any new medicine, either prescription or over-the-counter, check with your doctor or pharmacist. This includes aspirin.
For women: this medicine has been shown to cause harm to the human fetus. If you plan on becoming pregnant, discuss with your doctor the benefits and risks of using this medicine during pregnancy. This medicine is excreted in breast milk. If you are or will be breast-feeding while you are using this medicine, check with your doctor or pharmacist to discuss the risks to your baby.
Possible side effects
Side effects, that may go away during treatment, include nausea, indigestion, drowsiness, or hair loss. If they continue or are bothersome, check with your doctor. Contact your doctor immediately if you experience the following side effects or symptoms of toxicity: diarrhea, abdominal cramps, bruising, change in weight, tremor, changes in mood or behavior, change in menstrual period, swelling of the face, loss of appetite, extreme tiredness, yellowing of skin or eyes, unusual weakness, mental changes, or severe stomach pain with nausea and vomiting. If you notice other effects not listed above, contact your doctor, nurse, or pharmacist.
If you take too much
If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include deep sleep, irregular heartbeat, and loss of consciousness.
Additional information
Do not share this medicine with others for whom it was not prescribed. Do not use this medicine for other health conditions. Keep this medicine out of the reach of children. If using this medicine for an extended period of time, obtain refills before your supply runs out.
Drug interactions
Drug interactions can result in unwanted side effects or prevent a medicine from doing its job. Some medicines or medical conditions may interact with this medicine. Inform your doctor or pharmacist of all prescription and over-the-counter medicine that you are taking.