Stephen Johnsons syndrome goes away when you stop taking the medication that caused it. You will never be able to take that med again, which is why you could say it never goes away, but it's an allergy and only happens when you are in contact with the thing you're allergic to. You should not ever have it again--your doctor should make sure of that. I 'have' it, and my neuro is very careful about the meds he gives me, so I haven't had a reaction for four years. Ideally, you'll wear an alert bracelet, too.