Which statement is most important for the nurse to include in the teaching of a male patient undergoing treatment for invasive amebiasis?

The patient with well-controlled chronic obstructive pulmonary disorder presents with a 3 day history of increased cough with sputum production, fever, and malaise. Upon assessment, breath sounds are clear after coughing and the patient appears to breathe comfortably with no retractions or nasal flaring. His chest x-ray is clear and his screening complete blood count is largely normal, with exception of a white blood cell count of 16. The nurse anticipates the provider to order which medication(s)? Select all that apply. 

Which information does the nurse provide to the patient with epilepsy who has been prescribed phenytoin?