SIDE EFFECTS: Drowsiness, dizziness, weakness, tiredness, constipation, and loss of coordination (e.g., difficulty walking and controlling muscles) may occur. These side effects are more common during the first 4 weeks and usually lessen as your body adjusts to the medication. If any of these effects persist or worsen, notify your doctor.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 any of these unlikely but serious side effects occur: hair loss, neck pain, vision changes (e.g., double vision).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.Tell your doctor immediately if any of these rare but very serious side effects occur: unusual weakness, easy bleeding/bruising, signs of infection (e.g., fever, persistent sore throat).A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: 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.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.

PRECAUTIONS: Before using this medication, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies.Before using this medication, tell your doctor or pharmacist your medical history, especially of: blood disorders (e.g., anemia), kidney disease (including dialysis treatment), mental/mood disorders (e.g., depression).This drug may make you dizzy or drowsy, especially during the first month of treatment. Do not drive, use machinery, ride a bicycle, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.Kidney function declines as you grow older. This medication is removed by the kidneys. Therefore, elderly people may be at a greater risk for side effects such as dizziness while using this drug.Caution is advised when using this drug in children because they may be more sensitive to the effects of the drug, especially mental/mood changes (e.g., irritability, aggression, agitation, anger, anxiety, depression, hostility, thoughts of suicide).This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor.This drug passes into breast milk. Because of the possible harm to a nursing infant, breast-feeding while using this drug is not recommended.

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.