My clientele is different than yours. 2 mg rarely snows any of my patients. LOL
If it's an undifferentiated seizure, then yes, they get 2 mg of lorazepam even if it stops (1 mg if older). New onset, possible alcohol withdrawal, etc. If it's a known seizure that's a breakthrough seizure and they're on something I need a level for, then yes, they also get lorazepam until their level comes back.
I also give Keppra if it's new onset or they're not on it (and I'm waiting on a level for something). Keep in mind that Keppra takes 30-60 minutes to work. Peak plasma concentration occurs in about 60-90 mins. My decision to give lorazepam while loading with Keppra is to prevent another seizure in that hour of waiting for Keppra to take effect, which will thus eliminate another interruption in my workflow by another call from a nurse insisting that I come see the patient that is seizing again.
Not sure where you are, but none of my patients make it to a med/surg floor in <4 hours where the lorazepam has not worn off. Most are staying in the ER for 24 hours before getting a bed.