At the risk of redundancy, I'll re-post it here for better visibility.
Many people complain that their seizure medications cost a lot.
Each manufacturer has their own program. I'm not sure what the ceiling dose is, but it may be 3600 mg per day. They also make Dilantin, which, though less expensive, isn't exactly free at the drug store. Glaxo just bought Burrough-Wellcome, and the two offices to administer those programs merged also. I am told they can get medication to patients at reduced or no expense.