When Lily Giroux tries to go off her medications, her eyes roll and she slumps over for seconds at a time.
Grace Penwell shakes uncontrollably for about two minutes at least once a week, despite drugs and surgery.
Lily, 13, and Grace, 10, have epilepsy, a brain disorder marked by seizures.
Their parents, frustrated with the limits of treatments for the disease, are banking on an experimental approach at UW-Madison: a drug that mimics the low-sugar diets some people with epilepsy have tried since Biblical times.