More history is needed of course, but drugs can certainly cause seizures. Another point is that many things can look like seizures, so it's important to determine whether or not the event they had was truly an epileptic
phenomenonRaynaud's phenomenon
Raynaud’s phenomenon. Finally, other things such as environmental toxins can cause seizures, not just drugs. Years ago in Canada, a number of people who'd been eating shellfish and mollusks that were poisoned with bacteria from the ocean/sea came down with seizures and
cognitiveMental status tests changes due to the poison which interacted with brain cells. Just something to think about.