A child is prescribed phenytoin (Dilantin) chewable tablets for his seizure diagnosis. Monitoring for this drug includes assessing:

Anticonvulsants such as Phenytoin (Dilantin) are used in seizure management to stabilize neuronal membranes and prevent abnormal electrical activity in the brain. While effective, phenytoin is associated with several long-term adverse effects that require ongoing monitoring and patient education. One of the most characteristic and common side effects is gingival overgrowth, which can be minimized with proper oral care. Nursing care focuses on preventing complications and promoting adherence to therapy. Rationale: A. Heart rate monitoring and discontinuation of Phenytoin (Dilantin) based on bradycardia is not a standard monitoring parameter. Phenytoin toxicity primarily affects the central nervous system (e.g., nystagmus, ataxia, confusion) rather than causing clinically significant bradycardia. Heart rate thresholds are not used to guide discontinuation of this medication. B. Maintaining good oral hygiene is essential because Phenytoin (Dilantin) is well known to cause gingival hyperplasia due to fibroblast proliferation and collagen accumulation in the gums. Regular brushing, flossing, and dental care help reduce plaque buildup and minimize the severity of gum overgrowth. This is a key nursing teaching point for patients on long-term therapy, especially children. C. While CBC monitoring may be done in some anticonvulsant therapies, agranulocytosis is not a classic black box warning for Phenytoin (Dilantin). More commonly, phenytoin is associated with rare but serious effects such as blood dyscrasias, including leukopenia or aplastic anemia, but routine monitoring focuses more on drug levels and neurological toxicity. D. Pedal edema due to fluid retention is not a typical adverse effect of Phenytoin (Dilantin). While some anticonvulsants may cause weight changes or metabolic effects, phenytoin is primarily associated with neurologic, dermatologic, and gingival side effects rather than fluid overload. Monitoring for edema is not a key priority in patients receiving this medication.