It would be helpful to know what dose of carbamazepine that the mother is taking
and what SPECIFIC side-effects she is experiencing.
Hopefully the side-effects do not include blood dyscrasia, tachycardia, and
respiratory depression. They , of course, would be very serious.
That leaves sedation which should end after about a week of therapy.
That also leaves nausea, vomitting, and diarrhea.  If these are side-effects,
the mother should be put on another anticonvulsant if these side-effects persist
for a few days.
Frank J. Nice, DPA, CPHP