I think this question should be directed to your physician.

Since it is not a given that every patient with spina bifida has seizures, then there must be a reason that only some of them report this.

Wellbutrin(bupropion) is an antidepressant that has seizure risk for everyone. So that one clearly is out of the picture.

Also stimulants, like Ritalin and amphetamine, are sometimes used in minor depressions, so they also may lower the seizure threshold and should be avoided.

Sudden discontinuance of seizure control meds would induce a seizure, so if you change or stop suddenly that would be problematic for someone with seizures.

Drugs that lower the seizure threshold are listed at this website:
http://professionals.epilepsy.com/page/drugs.html
Click on the highlighted link to get the pdf list.

So the bottom line is that you should discuss this with your doctor. Take care!