Dilantin (Phenytoin)

Dilantin is a brand name for phenytoin, one of the oldest anti-seizure drugs still in wide use. It is prescribed to prevent and control seizures, including after brain surgery or head injury. Phenytoin has a narrow therapeutic range, meaning the gap between an effective dose and a toxic one is small, so doctors often monitor blood levels.

Phenytoin is known for several side effects that have led to lawsuits. The current Dilantin prescribing information warns of serious skin reactions, including Stevens-Johnson syndrome and toxic epidermal necrolysis, and of DRESS (drug reaction with eosinophilia and systemic symptoms), and it says the drug should not be resumed if signs suggest SJS or TEN. Other known effects include overgrowth of gum tissue, loss of coordination (ataxia), and, with long-term or toxic levels, damage to the cerebellum, the part of the brain that controls balance.

Lawsuits over Dilantin have generally alleged that the manufacturer did not adequately warn about these risks, or that a doctor or pharmacy caused toxicity through improper dosing or monitoring. The first type is a product liability claim. The second is a medical malpractice claim. Both are individual cases, because outcomes depend on each person's dose, blood levels, and medical history. Generic phenytoin cases face an added hurdle: the Supreme Court has held that generic makers generally cannot be sued under state law for failing to warn when their label matches the brand label.

If you had a severe reaction, keep records of your phenytoin blood levels, prescriptions, and hospital care. Our guide to class action versus individual lawsuit explains why these proceed one by one.