Many people who take Zonegran don't report any unwanted side effects. Those who experience undesirable effects most often complain of:

• sleepiness or fatigue
• dizziness
• loss of appetite (it's not unusual to lose several pounds)
• upset stomach
• headache
• agitation or irritability

Some less-common side effects are:

• poor coordination or tremor
• speech problems
• poor concentration
• itching
• vision problems

If you notice any of these problems, call the doctor's office. Sometimes the doctor can help by changing the amount of Zonegran you take or how you take it. Don't stop taking Zonegran or change the amount you take without the doctor's guidance.

You should be careful when you first start taking Zonegran. Make sure you don't have a problem with sleepiness or dizziness when driving or doing anything else that might be dangerous.

Be sure to read about the serious side effects so you will be aware of symptoms that might indicate the beginning of a dangerous reaction to Zonegran. These serious problems are very rare but everyone who takes this medicine should at least be aware of them.

Allergic reactions
Approximately 1 in 20 people who take Zonegran have a red rash within the first few weeks of taking it. If this happens, tell the doctor or nurse right away, to be sure that it's not the beginning of a serious problem. It's rare for the rash to be serious, but don't ignore it. It's often necessary to switch to a different seizure medicine.