Lacosamide: a Study of Exposures Reported to US Poison Centers over a 9-Year Period.

Background: Lacosamide (Vimpat®) is an anticonvulsant used to treat partial-onset seizures. Little is known about the characteristics and outcomes of patients exposed to lacosamide.

Objective: To characterize lacosamide exposures reported to US poison centers with regard to patient demographics, clinical effects, and outcomes.

Methods: This retrospective observational study queried the National Poison Data System (NPDS) for single substance lacosamide exposures from January 2008 to December 2016. Variables of interest included age, gender, medical outcome, management site, level of healthcare facility, reason for exposure, and clinical effects.

Results: Lacosamide exposures were identified in 1124 patients, ranging from ages 2 months to 99 years. Six hundred and twenty-two patients (55.3%) were female. Nine hundred and seventy-six patients (86.8%) had minimal or no toxic effects. Life-threatening exposures numbered 30 cases (2.7%). There was one death. Five hundred and forty-eight patients (48.8%) did not require healthcare management while 537 (47.7%) were either referred to or already at a hospital. Among those treated at a healthcare facility, 269 (50.1%) did not require admission. Thirty-three patients (6.1%) were admitted to a psychiatric facility, 68 (12.7%) to a non-critical care unit, and 93 (17.3%) to a critical care unit. Six hundred and thirty-two exposures (56.2%) were due to therapeutic error. Suicide attempts numbered 168 (14.9%). Neurologic, gastrointestinal, and cardiovascular symptoms were commonly encountered.

Conclusion: Lacosamide exposures infrequently cause death or disability; however, a considerable proportion of the study population required intensive care. Exposed patients with symptoms require healthcare evaluation.