I forget what the number is called, but I mean the first one, like 230/150 or something to that effect. I would think a seizure is possible, but am unaware of the consequences. Thank you for your concern, but it is not me that suffers from it. I have a relative that has been on medication for high blood pressure for a long time and still has extremely high numbers almost everyday. Honestly, I do not understand how he is still standing.