It could be due to the medication, I would advise u to talk to he's neurologist or someone from he's epilepsy team like he's epilepsy nurse.
Having outbursts like that isn't good so he might have to be put onto another medication.
I hope u get the help needed.
@A MyEpilepsyTeam Member , I found this on Google https://www.briviact.com/side-effects . It suggests you contact the doctor if the person starts experiencing a certain list of side effects & that’s in the link above. On Google it says that Briviact can cause mood swings, anger issues, etc. It sounds like it’s similar to Keppra but they’re not exactly alike but very similar. So Wednesday, contact his doctor or Nurse & let them know what’s going on. In 2019 I was on Keppra for 2 months & it made me so tired that I had to take a nap every day & eventually I started having trouble sleeping & so I got off it. If you & your son don’t like the side effects of a medication, don’t hesitate to talk to his doctor & see if another medication might be better. Good luck. Welcome to the site! Your friend in Texas, Becky
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Please give son & self a break bout meds sides. How it's controlling seizures most important. Realize advice given here may not even pertain to son or his type of epilepsy. Ease mind best by consulting with Dr who knows son best. Keep in mind meds change things to avoid the seizures give son's mind time it needs to adjust them. I'm sure you'd never screw around with meds by advice of others.