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DRUG INTERACTIONS: Tell your doctor of all prescription and nonprescription medication you may use, especially: other anti- seizure medication (e.g., phenytoin, phenobarbital, carbamazepine, felbamate, clonazepam, ethosuximide, lamotrigine, primidone), tricyclic antidepressants (e.g., amitriptyline, nortriptyline), rifamycins (e.g., rifampin, rifabutin), certain diabetes medication (e.g., tolbutamide), warfarin, aspirin, erythromycin, zidovudine. Tell your doctor if you take any drugs that cause drowsiness, such as: medicine for sleep, sedatives, tranquilizers, anti- anxiety drugs (e.g., diazepam), narcotic pain relievers (e.g., codeine), psychiatric medicines (e.g., phenothiazines such as chlorpromazine), muscle relaxants, certain antihistamines (e.g., diphenhydramine). Check the labels on all your medicines (e.g., cough-and-cold products) because they may contain drowsiness-causing ingredients. Ask your pharmacist about the safe use of these products. This drug may interfere with certain laboratory tests (e.g., urine ketones and thyroid function tests). Make sure laboratory personnel and your doctors know you use this drug.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include: severe drowsiness, coma, or severe chest pain.

NOTES: Laboratory and/or medical tests (e.g., liver function tests, blood count) will be performed to monitor for side effects and response to treatment.

MISSED DOSE: If you miss a dose, contact your doctor immediately to establish a new dosing schedule.

STORAGE: Store vials at room temperature between 59 and 86 degrees F (15 to 30 degrees C) away from light and moisture. After dilution in correct IV fluids and storage in a proper container (consult your pharmacist for details), the drug is stable at room temperature for 24 hours. Discard any unused portion of the vial(s).

MEDICAL ALERT: Your condition can cause complications in a medical emergency. For enrollment information call MedicAlert at 1-800-854-1166 (USA), or 1-800-668-1507 (Canada).

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.