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

• decreased appetite and weight loss
• nausea
• insomnia (sleeplessness)
• headache

Some other side effects were:

• poor coordination or tremor (shaking)
• vision problems
• dizziness
• vomiting
• mood changes or anxiety
• sleepiness (when given in combination with other seizure medicines)

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

People who have just started taking Felbatol (or who have just started taking a larger amount) should be careful during activities that might be dangerous, until they know whether they are having any side effects.

IMPORTANT
Serious blood and liver problems have occurred in a small number of people taking Felbatol. In some cases, these people died. Be sure to read about the serious side effects so you will be aware of symptoms that might indicate the beginning of one of these problems.

Allergic reactions
A rash occurs in a small number of people who take Felbatol. This reaction usually occurs within the first few weeks of treatment. Contact your doctor if a rash develops.