In simple words: The patient took a smaller dose of their epilepsy medications than they should have, and this is the first time they've seen a doctor for this problem.

The patient has unintentionally taken less of a combination of antiepileptic medications than prescribed or instructed by a healthcare professional. This is the patient's first encounter for this issue.

Example 1: A patient with epilepsy, prescribed multiple antiepileptic medications, accidentally misses a dose or takes less than prescribed, leading to a breakthrough seizure. This is their first visit for this underdosing instance., A patient recently started on a combination of antiepileptic drugs, misunderstands the dosing instructions, and takes a lower dose than prescribed, resulting in increased seizure frequency. This is the initial encounter for this underdosing., An elderly patient with epilepsy, prescribed a complex regimen of multiple antiepileptic medications, struggles with medication management and unintentionally underdoses, leading to worsening symptoms. This is the first time they are seeking medical attention for this specific underdosing event.

Documentation should include the specific antiepileptic medications involved, the prescribed dosage, the actual dosage taken, the duration of the underdosing, any related symptoms or adverse effects experienced, and relevant medical history related to the patient's epilepsy.