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Vigabatrin is used to treat babies, one month to 2 years old who have a condition known as infantile spasms. Vigabatrin has also been used in combination with other medications to treat seizure disorders (epilepsy). Vigabatrin decreases the number of seizures in adults and children who have not been able to control their seizures with other treatment. Vigabatrin is an anticonvulsant. It is thought to work by stopping the breakdown of a natural calming substance (GABA) in the brain.

If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

Read the Medication Guide provided by your pharmacist before you start taking vigabatrin and each time you get a refill. If you have any questions regarding the information, consult your doctor or pharmacist. Mix the contents of the packet in a glass of water, and drink immediately after mixing. Do not mix in advance or store for future use. If the dose is less than a full packet, mix the entire contents of the packet in 10 milliliters of liquid. Mix well and measure the dose using a special measuring device. Do not use a household spoon because you may not get the correct dose. Discard any unused medication. If you are using two packets, then mix the contents in 20 milliliters of liquid. If you are using three packets, then mix the contents in 30 milliliters of liquid. Each packet should have 500 milligrams of vigabatrin. If the packets you receive have more than 500 milligrams of vigabatrin, consult your pharmacist for how to mix this product. Take this medication by mouth with or without food, usually twice a day or as directed by your doctor. The dosage is based on your medical condition and response to treatment. Your doctor may direct you to take a low dose at first, gradually increasing the dose to lower the chance of side effects such as drowsiness and confusion. Your doctor will adjust your dose to find the best dose for you. Follow your doctor's directions carefully. The usual maximum dose for adults is 3 grams a day. Take this medication regularly to get the most benefit from it. To help you remember, take it at the same times each day. Continue to take your other seizure medications unless otherwise directed by your doctor. Vigabatrin is not usually used alone except in the treatment of spasms in infants. Do not increase your dose or take this medication more often than prescribed. Your condition will not improve any faster, and the risk of serious side effects may be increased. Do not stop taking this medication without consulting your doctor. Your seizures may become worse when the drug is suddenly stopped. Your dose may need to be gradually decreased. Tell your doctor if your infant's spasms worsen or have not improved within 2 to 4 weeks.

Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first. This drug should not be used with the following medications because very serious interactions may occur: drugs that can harm the eye (retinotoxic drugs such as chloroquine, hydroxychloroquine, phenothiazines including thioridazine). If you are currently using any of these medications listed above, tell your doctor or pharmacist before starting vigabatrin. Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: phenytoin. Tell your doctor or pharmacist if you also take drugs that cause drowsiness such as: certain antihistamines (e.g., diphenhydramine), anti-seizure drugs (e.g., carbamazepine), medicine for sleep or anxiety (e.g., alprazolam, diazepam, zolpidem), muscle relaxants, narcotic pain relievers (e.g., codeine), psychiatric medicines (e.g., chlorpromazine, risperidone, amitriptyline, trazodone). Check the labels on all your medicines (e.g., cough-and-cold products) because they may contain ingredients that may cause drowsiness. Ask your pharmacist about using those products safely. This product can affect the results of certain lab tests (e.g., liver function tests), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug. This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

Your condition can cause complications in a medical emergency. For information about enrolling in MedicAlert, call 1-800-854-1166 (USA) or 1-800-668-1507 (Canada).

Do not share this medication with others. Laboratory and/or medical tests (e.g., eye exams, kidney/liver tests) should be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.

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. Canada residents can call a provincial poison control center. Symptoms of overdose may include: slow/shallow breathing, loss of consciousness.

Before taking vigabatrin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: certain eye problem (visual field defect). Tell your doctor if you have a history of: other eye problems (e.g., glaucoma, macular degeneration, optic nerve problem), mental/mood problems (e.g., depression, psychosis), kidney disease, liver disease. This drug may make you dizzy or drowsy or cause vision problems. Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are sure you can perform such activities safely. Limit alcoholic beverages. MRI tests of the brain in infants have shown changes after they are given vigabatrin. It is not known if these changes are harmful. Consult your doctor for more details. If your infant is going to have an MRI test, notify testing personnel that your infant is using this medication. Kidney function declines as you grow older. This medication is removed by the kidneys. Therefore, elderly people may be at greater risk for side effects (e.g., confusion) while using this drug. During pregnancy, this medication should be used only when clearly needed. It may harm an unborn baby. If you become pregnant or think you may be pregnant, tell your doctor immediately. Talk with your doctor about effective forms of birth control. This medication passes into breast milk and could have undesirable effects on a nursing infant. Therefore, breast-feeding is not recommended while using this drug. Consult your doctor before breast-feeding.

Store at room temperature between 68-77 degrees F (20-25 degrees C) away from light and moisture. Do not open the packets before it is time to prepare the dose. Do not store in the bathroom. Keep all medicines away from children and pets. Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

See also Warning section. Drowsiness, dizziness, and difficulty concentrating may occur, especially during the first few days as your body adjusts to the medication. Children may become restless or excited. Nausea, vomiting, headache, weight gain, and tiredness may also occur. If any of these effects persist or worsen, tell 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 any of these unlikely but serious side effects occur: shakiness (tremor), increase in seizures, tingling/numbness. 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. Seek immediate medical attention if any of these rare but very serious side effects occur: severe drowsiness/difficulty waking up, severe mental/mood changes (e.g., confusion, hallucinations). Vigabatrin has rarely caused very serious liver disease. Tell your doctor immediately if you develop symptoms of liver disease, including persistent nausea, stomach/abdominal pain, dark urine, yellowing eyes/skin. A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: 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.

Serious vision problems may occur while taking this medication and may be permanent even after you stop taking the medication. To prevent vision problems from getting worse, your doctor must find any eye problems as early as possible. Also, tell your doctor if you have a history of vision problems. It is very important that you have an eye exam before starting this medication, 4 weeks later, then every 3 months thereafter while you are taking this medication. You should also have an eye exam 3 to 6 months after stopping this medication. Follow your doctor's directions carefully and keep all medical/eye/lab appointments. Tell your doctor immediately if you have any changes in vision (such as loss of vision, blurred vision, double vision, sensitivity to light, eye pain). Only patients who have signed an informed consent and agree to the requirements of the SHARE program (Support, Help and Resources for Epilepsy-SHARE) may obtain and use vigabatrin. Only physicians enrolled in SHARE may prescribe vigabatrin, and only pharmacies enrolled in the program may dispense it. Consult your doctor or pharmacist for more details about the SHARE program and for more information about the risk and benefits of using this medication. These requirements apply in the United States. If you live in Canada or any other country, consult your doctor and pharmacist for your country's regulations.