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HomeAnswersNeurologyseizureI feel dizzy and disoriented after taking Briviact. Why?

Is it common to feel dizzy while switching from Phenytoin to Briviact?

Is it common to feel dizzy while switching from Phenytoin to Briviact?

The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

iCliniq medical review team

Published At December 13, 2016
Reviewed AtDecember 21, 2023

Patient's Query

Hello doctor,

I recently tried switching medicines from Phenytoin to Briviact. Last night, was the first time I tried it. I am transitioning off the Phenytoin. I became dizzy, disoriented and felt very weird. I have not had a seizure in the last 9 years. But, I was not ready to go off the medicines, since I do a lot of traveling. My neurologist recommended to try a new medication with less side effects. Is this a common experience while switching Phenytoin to Briviact? I took it last night at 9.30 and I am still feeling out of it and irritable. I have never had this side effect from the Phenytoin.


Welcome to icliniq.com. Drowsiness and sleepiness are the most common side effect of the Briviact (Brivaracetam). Usually, this side effect will get reduced over three to four days. If it does not improve, then I think you should switch back to Phenytoin. As you said, there were no seizures for 9 years, then it is a time to wean off your medicines. I am sure that your doctor would have done an EEG (electroencephalogram) for you and there would be a plan to wean off the medicines if the EEG is normal. If the side effects do not reduce over three to four days, you can switch back to Phenytoin and then gradually taper it under periodic EEG monitoring.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Hardik Nareshbhai Rajyaguru
Dr. Hardik Nareshbhai Rajyaguru


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