The brand name of the drug is Zonegran, and its active ingredient is zonisamide, which is a sulfonamide antiseizure medication. Zonegran is available in capsule form for oral administration, with strengths of 25 mg and 100 mg zonisamide. Key inactive ingredients include microcrystalline cellulose, hydrogenated vegetable oil, sodium lauryl sulfate, gelatin, and titanium dioxide.

How should I use this medication?

Take this medication by mouth with water. Take it as directed on the prescription label at the same time every day. Do not cut, crush, or chew this medication. Swallow the capsules whole. You can take it with or without food. If it upsets your stomach, take it with food. Keep taking it unless your care team tells you to stop. A special MedGuide will be given to you by the pharmacist with each prescription and refill. Be sure to read this information carefully each time. Talk to your care team about the use of this medication in children. While it may be prescribed for children as young as 16 years for selected conditions, precautions do apply.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once. NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

Where should I keep my medication?

Keep out of the reach of children and pets. Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Protect from light. Get rid of any unused medication after the expiration date. To get rid of medications that are no longer needed or have expired: -Take the medication to a medication take-back program. Check with your pharmacy or law enforcement to find a location. -If you cannot return the medication, check the label or package insert to see if the medication should be thrown out in the garbage or flushed down the toilet. If you are not sure, ask your care team. If it is safe to put it in the trash, pour the medication out of the container. Mix the medication with cat litter, dirt, coffee grounds, or other unwanted substance. Seal the mixture in a bag or container. Put it in the trash.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.

What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible: -Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat -Aplastic anemia—unusual weakness or fatigue, dizziness, headache, trouble breathing, increased bleeding or bruising -CNS depression—slow or shallow breathing, shortness of breath, feeling faint, dizziness, confusion, trouble staying awake -Fever that does not go away, decreased sweating -High acid level—trouble breathing, unusual weakness or fatigue, confusion, headache, fast or irregular heartbeat, nausea, vomiting -High ammonia level—unusual weakness or fatigue, confusion, loss of appetite, nausea, vomiting, seizures -Infection—fever, chills, cough, or sore throat -Kidney stones—blood in urine, pain or trouble passing urine, pain in the lower back or sides -Rash, fever, and swollen lymph nodes -Redness, blistering, peeling, or loosening of the skin, including inside the mouth -Sudden eye pain or change in vision such as blurry vision, seeing halos around lights, vision loss -Thoughts of suicide or self harm, worsening mood, feelings of depression Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome): -Difficulty with paying attention, memory, or speech -Dizziness -Drowsiness -Irritability -Loss of appetite -Loss of balance or coordination -Slow or sluggish movements of the body

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions: -Kidney disease -Liver disease -Low levels of bicarbonate in your blood -Lung disease -Suicidal thoughts, plans, or attempt -An unusual or allergic reaction to zonisamide, sulfa medications, other medications, foods, dyes, or preservatives -Pregnant or trying to get pregnant -Breast-feeding

What may interact with this medication?

-Acetazolamide -Alcohol -Antihistamines for allergy, cough, and cold -Certain medications for anxiety or sleep -Certain medications for depression, such as amitriptyline, fluoxetine, sertraline -Certain medications for seizures, such as carbamazepine, phenobarbital, phenytoin, primidone, topiramate -Dichlorphenamide -General anesthetics, such as halothane, isoflurane, methoxyflurane, propofol -Medications that relax muscles for surgery -Opioid medications for pain or cough -Phenothiazines, such as chlorpromazine, mesoridazine, prochlorperazine, thioridazine -Rifampin

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

Visit your care team for regular checks on your progress. Tell your care team if your symptoms do not start to get better or if they get worse. Do not suddenly stop taking this medication. You may develop a severe reaction. Your care team will tell you how much medication to take. If your care team wants you to stop the medication, the dose may be slowly lowered over time to avoid any side effects. This medication may affect your coordination, reaction time, or judgment. Do not drive or operate machinery until you know how this medication affects you. Sit up or stand slowly to reduce the risk of dizzy or fainting spells. Drinking alcohol with this medication can increase the risk of these side effects. This medication may cause serious skin reactions. They can happen weeks to months after starting the medication. Contact your care team right away if you notice fevers or flu-like symptoms with a rash. The rash may be red or purple and then turn into blisters or peeling of the skin. You may also notice a red rash with swelling of the face, lips, or lymph nodes in your neck or under your arms. This medication may cause thoughts of suicide or depression. This includes sudden changes in mood, behaviors, or thoughts. These changes can happen at any time but are more common in the beginning of treatment or after a change in dose. Call your care team right away if you experience these thoughts or worsening depression. Tell your care team right away if you have any change in your eyesight. Wear a medical ID bracelet or chain. Carry a card that describes your condition. List the medications and doses you take on the card. Talk to your care team if you may be pregnant. Serious birth defects can occur if you take this medication during pregnancy.