A 28-year-old woman from rural Maharashtra presents to the emergency department with a 2-hour history of recurrent seizures. She has had 4 generalized tonic-clonic seizures in the past 2 hours without regaining consciousness between episodes. Her husband reports she started on phenytoin monotherapy 6 months ago for newly diagnosed epilepsy but has been non-compliant with medication for the past 3 weeks. On examination, she is post-ictal, blood pressure 140/90 mmHg, heart rate 110/min. There is no fever. Blood glucose is 120 mg/dL. CT head is normal. What is the most appropriate immediate management?