Is there a word or phrase that describes an object that would cause an epileptic seizure? In a similar way that something that causes an allergy attack is an allergen For example, the flashing lights in the game were _____. The closest thing I can think of is possibly "triggering" but that isn't very specific.
The term of art is "epileptogenic," but this term is slightly misleading because it encompasses only seizures arising from epilepsy, which is neurological disorder. Sometimes normal brains can go into seizure, so the more general term is "ictogenic," from the Latin icere, to strike. For a medical exposition, see Seizures and Epilepsy by Jerome Engel.
An English phrase would be "seizure-inducing".
Numerous web dictionaries and wikis define
convulsant as an agent, usually a drug, that induces seizures. An
anticonvulsant is a drug used to treat seizures.