Side effects most often reported by patients taking Felbatol (felbamate) have included:

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

Some other side effects mentioned even less often were:

• poor coordination or tremor
• vision problems
• dizziness
• vomiting
• mood changes or anxiety
• sleepiness (when given in combination)

If you notice problems like any of these while you are taking Felbatol, it's probably a good idea to discuss them with your doctor or nurse. Sometimes the doctor can help with side effects by reducing the amount of Felbatol prescribed or changing the amount taken at certain times, such as taking a greater proportion of the Felbatol at bedtime to reduce daytime sleepiness. Don't stop taking Felbatol or any other seizure medicine without your doctor's advice.

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

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.

Allergic reactions
Rash is seen in a small number of patients who take Felbatol. This reaction usually occurs early in the course of therapy. Contact your doctor if a rash develops.