Background: Data on intravenous lacosamide use in young pediatric patients is scarce, especially of pre-school age. Methods: We retrospectively reviewed the medical records of all patients less than 6 years old who received intravenous lacosamide at our tertiary pediatric hospital. Data on dose, timing and order of administration was collected. Clinical and electrographic response was independently assessed with EEG interpretation blinded to time of administration. For adverse effects surveillance, heart rate was noted before and 1 hour after dose. Results: Eleven patients (8 boys), received lacosamide between 2013 and 2018. Mean age was 2 years (11 days – 5,3 years). Medical indications were: refractory status epilepticus (n=6), repetitive seizures (n=4), and inability to take oral lacosamide (n=1). On average, lacosamide was the fifth (1st-8th) IV antiepileptic drug administered 78 hours (SD 11 hours) after presentation. The most frequent dose was 5 mg/kg. Clinical response was confirmed in 7 patients, while electrographic response was proven in 3 patients. Seizure relapse at 24 hours was noted in 6 patients. No bradycardia occurred post-lacosamide. Conclusions: Although very safe, therapeutic response to lacosamide in young pediatric patients was inconclusive, mostly due to delay in administration, suboptimal dose, and high number of other IV antiepileptic drugs previously given.