Yes, my phenobarbital has a half life of 50 to 180 hours and my lamotragine is only about 24-30 hours. Once you hit a steady state of phenobarbital it stays around forever.
I think that varies. I know I have one that is time released. So that one tends to last longer.
I would be able to change when they were taken after a number of days.
@A MyEpilepsyTeam Member You should do what makes you feel the most comfortable and safe. I just moved my doses back an hour and I haven't had any problems.
Who knows? As long as they work, why worry!