An adult client with a seizure disorder is prescribed phenytoin. In reviewing the client's record, the nurse determines that the current serum phenytoin level is 17 mcg/mL (67.32 mmol/L). Which action should the nurse take? Reference Range: Phenytoin 7.5 to 20 mcg/ml (29.7 to 79.3 mmol/L)

Rationale: A. Withhold the dose until the healthcare provider is notified: Withholding is not appropriate because the client’s serum phenytoin level of 17 mcg/mL is within the therapeutic range of 7.5 to 20 mcg/mL. Stopping the medication could place the client at risk of breakthrough seizures. B. Administer the medication as prescribed: Since the current serum phenytoin level is therapeutic, the safest action is to continue administering the drug as ordered. Maintaining consistent dosing is essential for seizure prevention and to avoid fluctuations that may trigger seizure activity. C. Prepare to administer diazepam IV STAT: Diazepam IV is used for acute seizure management or status epilepticus, not for routine care in a stable client. There is no evidence of active seizures. D. Document the increased risk for seizure activity: A level of 17 mcg/mL does not indicate an increased seizure risk, as it lies within the therapeutic range. Increased risk would occur if the level were subtherapeutic, below 7.5 mcg/mL, or supratherapeutic, above 20 mcg/mL.