I have taken brand name dilantin most of my life. I was always afraid of switching to the generic but finally decided to try it a few months back. Sure enough, I had a full fledged grand mal for the first time in 18 years. My blood levels showed I was low (well below the desired 10 to 20). Can anyone tell me why the generic works different than the brand name? I've heard they use different bonding agents for the capsules as one possibility.