Jeffrey Panko NP Psychiatry · Patient education
Zonisamide
Zonegran / Zonisade oral suspension / Generic capsules
A guide for adults taking zonisamide.
Follow the directions on your prescription and your provider's recommendations.
Formulations: Capsules and oral suspension have different handling instructions. The long duration means dose changes should be gradual.
What it is used for
Zonisamide treats focal seizures. Psychiatric or weight-related uses are off-label and require a separate evidence discussion; it is not an established bipolar mood stabilizer.
How it works
It affects sodium and calcium channels and inhibits carbonic anhydrase. These actions can reduce seizure activity and also contribute to metabolic acidosis or kidney stones.
What to expect over time
The dose is often increased gradually to balance benefit and side effects. Track the condition being treated and report changes after each adjustment.
Taking your medication
- Take at the prescribed times, with or without food.
- Swallow capsules whole. Shake suspension and use an accurate dosing device.
- Maintain appropriate hydration.
- If you miss a dose, take it when you remember unless it is almost time for the next dose. Then skip it. Do not double a dose.
- Consult with your provider before stopping.
When to get help
Emergency symptoms. Get emergency care for blistering rash or mouth sores, severe overheating, sudden eye pain or vision changes, or a prolonged or repeated seizure.
Prompt medical advice. Contact your provider promptly for a new rash, severe unsteadiness, unusual confusion, or major changes in mood or behavior.
If you feel unsafe or have thoughts of self-harm, call 911 or go to an emergency department.
Possible side effects
- Sleepiness, dizziness, or fatigue
- Reduced appetite or weight loss
- Word-finding or concentration problems
- Nausea or poor coordination
Keeping track of treatment
Some side effects resolve with time; others may require a change of medication. Discuss persistent or bothersome side effects with your provider.
Report changes in mood, behavior, concentration, or suicidal thoughts. Antiseizure medicines carry a warning about suicidal thoughts and behavior.
Keep follow-up appointments. Your provider may adjust treatment based on symptoms, kidney or liver function, other medicines, and any recommended laboratory tests.
Bicarbonate and kidney function may be checked. Report reduced sweating, overheating, rapid breathing, flank pain, or blood in urine.
If you take too much
For a suspected overdose, call Poison Control at 1-800-222-1222 immediately, even if you feel well. Call 911 for a seizure, collapse, trouble breathing, or inability to wake.
Before you start
Discuss kidney or liver disease, previous medication rashes, depression, and the reason for treatment.
Discuss pregnancy, pregnancy plans, and breastfeeding with your provider. Treatment decisions should consider both the medication and the condition being treated.
A sulfonamide allergy can rule out treatment. Discuss kidney disease, stones, severe rashes, glaucoma, and ketogenic diets. Review pregnancy-related risks before treatment when possible.
Medicines and interactions
Review all your medications with your provider, including over-the-counter medicines and supplements. Have new medications checked before taking them.
Other carbonic-anhydrase inhibitors can add acidosis and kidney-stone risk. Valproate or topiramate may add hyperammonemia concerns.
Enzyme-inducing medicines can change levels; alcohol and sedatives add impairment.
Everyday tips
Use reminders and arrange refills before you run out.
Avoid driving until you know how treatment affects you; seizure-related driving restrictions may also apply.
Your questions answered
Can I stop if I feel well?
Consult with your provider before stopping. Abrupt withdrawal can cause seizures or a return of the condition being treated.
Does use for seizures mean I have epilepsy?
Not necessarily. Some antiseizure medicines have other approved or off-label uses. Confirm the specific goal of your prescription.
Storage and safety
Keep medication in its labeled container, away from excess heat and moisture and out of reach of children and pets. Do not share it. Ask a pharmacy about disposal of unused medication.
Sources
About this information
Educational handout; does not replace your prescription or provider's recommendations.
Educational inclusion does not mean this medication or its indications are treated at this practice. Review the guide for your exact product with your prescriber or pharmacist.