title: Levetiracetam Versus Phenytoin for Seizure Prophylaxis Following Traumatic Brain Injury: A Systematic Review and Meta-Analysis.
abstract: Seizure following traumatic brain injury (TBI) constitutes a common complication that requires effective prevention to improve the outcome of TBI. Phenytoin has been the only recommended antiepileptic drug (AED) for seizure prophylaxis; however, several shortcomings have affected its use. Intravenous levetiracetam has been available since 2006 and has been increasingly accepted as a seizure prophylaxis for brain injury, mainly due to its favorable pharmacokinetic features and minimal adverse events profile. However, the efficacy and safety of levetiracetam versus phenytoin for seizure prophylaxis following TBI are not well clarified.
  
  
  
  The aim of this study was to assess the efficacy and safety of levetiracetam versus phenytoin for seizure prophylaxis following TBI.
  
  
  
  We conducted a search of the MEDLINE, EMBASE, and Cochrane library databases to March 2016, and screened original research that included patients with TBI who received levetiracetam. We included randomized controlled trials (RCTs) or controlled observational cohort studies that compared levetiracetam and phenytoin, as well as uncontrolled case series regarding prophylactic levetiracetam following TBI. The outcomes included early or late seizure prophylaxis and safety. The estimates of seizure prophylaxis were pooled using a meta-analysis, and the estimates for the case series were pooled using descriptive statistics.
  
  
  
  A total of 1614 patients from 11 studies were included in this review, of whom 1285 patients from eight controlled studies (one RCT and seven cohort studies) were included in the meta-analysis. Levetiracetam was not superior to phenytoin with regard to early seizure prophylaxis (risk ratio [RR] 1.10, 95 % confidence interval [CI] 0.64-1.88); the estimate of early seizure incidence was 0.05 (95 % CI 0.02-0.08). Three studies that assessed late seizure did not indicate the superiority of levetiracetam to phenytoin. There were no differences in mortality during hospitalization or after 6 months, or in the number of patients with adverse reactions between levetiracetam and phenytoin.
  
  
  
  Levetiracetam does not appear to be superior to phenytoin in efficacy or safety with regard to early or late seizure prophylaxis following TBI; however, no class I evidence was identified. Additional evidence from high-quality studies is required.
authors.affiliation: Department of Neurology, Chongqing Key Laboratory of Neurology, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Neurology, Chongqing Key Laboratory of Neurology, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China.
authors.forename: Fangshuo
authors.initials: F
authors.lastname: Zheng
authors.affiliation: Department of Neurology, Chongqing Key Laboratory of Neurology, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
authors.affiliation: Department of Neurology, Chongqing Key Laboratory of Neurology, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China. xfyp@163.com.|Center of Epilepsy, Beijing Institute for Brain Disorders, Beijing, China. xfyp@163.com.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wang
mesh_terms: D000927:Anticonvulsants / Q000009:adverse effects / Q000627:therapeutic use*; D000070642:Brain Injuries, Traumatic / Q000188:drug therapy*; D015331:Cohort Studies; D006801:Humans; D000077287:Levetiracetam; D064887:Observational Studies as Topic; D010672:Phenytoin / Q000009:adverse effects / Q000627:therapeutic use*; D010889:Piracetam / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D016032:Randomized Controlled Trials as Topic; D012640:Seizures / Q000188:drug therapy*
chemical_list: D000927:Anticonvulsants; D000077287:Levetiracetam; D010672:Phenytoin; D010889:Piracetam