What is the toxic level for Dilantin?

• A. Over 10
• B. Over 15
• C. Over 20
• D. Over 25

Answer: (C)

Dilantin, also known as phenytoin, is an anticonvulsant medication commonly used to manage seizure disorders. The therapeutic range for Dilantin is typically between 10 to 20 mcg/mL. When levels exceed this therapeutic range, particularly if they reach over 20 mcg/mL, the patient is at risk for toxicity.

Toxicity from Dilantin can lead to symptoms such as nystagmus (involuntary eye movement), ataxia (loss of coordination), slurred speech, and lethargy, progressing to more severe neurological impairments in cases of significantly elevated levels. Therefore, recognizing that a level over 20 mcg/mL indicates potential toxicity is essential for effective patient management and safety. Any levels above this threshold warrant immediate assessment and intervention to prevent severe adverse effects.

The correct identification of over 20 mcg/mL as the toxic level for Dilantin is crucial for nursing practice, as it helps in monitoring patients effectively and ensuring optimal therapeutic outcomes while minimizing risks associated with the medication.