What is the most appropriate action by the nurse when monitoring a client receiving phenytoin?

The most appropriate action when monitoring a client receiving phenytoin is to check liver function tests regularly. Phenytoin is anticonvulsant medication that is highly protein-bound and metabolized by the liver. Regular monitoring of liver function is crucial because phenytoin can cause hepatotoxicity and lead to liver damage, especially with long-term use.

Detecting any abnormalities in liver function tests allows for timely interventions, which may include adjusting the medication dosage or changing the treatment plan to prevent further complications. This is particularly important in patients who may have pre-existing liver conditions or who are on other medications that also affect liver function.

While monitoring for signs of dehydration, evaluating blood sugar levels, and assessing changes in heart rhythm can be important in specific clinical contexts, they are not as directly related to the effects of phenytoin. Dehydration is not a primary concern specifically associated with phenytoin therapy, blood sugar levels are more pertinent in diabetic patients or those receiving corticosteroids, and heart rhythm changes can occur but are not the primary focus in patients solely taking phenytoin.