Cholesterol Medication Side Effects

My brother who has severe learning difficulties recently had blood tests done to check various things as he has been a controlled epileptic for the last 15-20 years.

His cholesterol levels returned at 11.3.The doctor precribed him Simvastatin 40mg,also assuring me that these meds were epileptic friendly.

After taking the new meds for 5 nights he had 2 seizures within half an hour.

I took him back to the doctor and stopped the medication.

He (touch wood)has returned to normal and no more seizures.

Too much of a co-incidence in my mind that this new medication didn't cause an imbalance somewhere(and very quickly).

Any help with any findings/research on this problem?

                          Many Thanks