(PHARM) The nurse instructs a person taking phenytoin (Dilantin) that periodic blood tests will be necessary. The nurse explains that the laboratory checks will monitor for which potential medication-induced change?

A. While creatinine levels are important for kidney function, phenytoin is more commonly associated with hepatic (liver) effects than renal toxicity. B. Phenytoin is metabolized in the liver and can cause hepatotoxicity. Periodic liver function tests are essential to monitor for potential liver damage. C. Potassium depletion is not typically associated with phenytoin use. It is more commonly a concern with diuretics or other medications affecting electrolytes. D. Sedimentation rate is a non-specific marker of inflammation and is not used to monitor phenytoin therapy.