The therapeutic range for Dilantin is __________. It is essential for effective seizure control.

10–20 mcg/mL: This is the established therapeutic range for phenytoin (Dilantin) in serum. Maintaining levels within this range ensures adequate seizure control while minimizing toxicity. Levels below 10 mcg/mL may be ineffective, and levels above 20 mcg/mL increase the risk of adverse effects such as nystagmus, ataxia, and confusion.