title: Pharmacokinetics and acid-suppressive effects of esomeprazole in infants 1-24 months old with symptoms of gastroesophageal reflux disease.
abstract: OBJECTIVE
  To evaluate the pharmacokinetics and acid-suppressive effects of esomeprazole in infants with gastroesophageal reflux disease (GERD).
  
  
  METHODS
  In this single-blind, randomized, parallel-group study, 50 infants 1 to 24 months old with symptoms of GERD, and >or=5% of time with intraesophageal pH <4 during 24-hour dual pH monitoring, received oral esomeprazole 0.25 mg/kg (n = 26) or 1 mg/kg (n = 24) once daily for 1 week. Intraesophageal and intragastric pH were recorded at 1 week, and blood samples were taken for pharmacokinetic analysis.
  
  
  RESULTS
  At baseline, mean percentages of time with intragastric pH >4 and intraesophageal pH <4 were 30.5% and 11.6%, respectively, in the esomeprazole 0.25 mg/kg group and 28.6% and 12.5% in the esomeprazole 1 mg/kg group. After 1 week of treatment, times with intragastric pH >4 were 47.9% and 69.3% in the esomeprazole 0.25 mg/kg and 1 mg/kg groups, respectively (P < 0.001 vs baseline), and times with intraesophageal pH <4 were 8.4% (P < 0.05 vs baseline) and 5.5% (P < 0.001 vs. baseline), respectively. The mean number of acid reflux episodes of >5 minutes duration decreased from 6 at baseline to 3 and 2 with esomeprazole 0.25 mg/kg and 1 mg/kg, respectively. The geometric mean AUC0-t of esomeprazole were 0.24 and 1.79 micromol x h/L for the 0.25 mg/kg and 1 mg/kg dosages of esomeprazole, respectively. Both esomeprazole dosages were well tolerated.
  
  
  CONCLUSIONS
  Oral treatment with esomeprazole 0.25 mg/kg and 1 mg/kg was well tolerated and provided dose-related acid suppression, dose-related exposure to esomeprazole, and decreased esophageal acid exposure in infants 1-24 months old with GERD.
authors.affiliation: Centre for Paediatric and Adolescent Gastroenterology, Women's and Children's Hospital, North Adelaide, Department of Paediatrics, University of Adelaide, Australia. taher.omari@adelaide.edu.au
authors.forename: Taher
authors.initials: T
authors.lastname: Omari
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Davidson
authors.forename: Patrik
authors.initials: P
authors.lastname: Bondarov
authors.forename: Emma
authors.initials: E
authors.lastname: Nauclér
authors.forename: Catarina
authors.initials: C
authors.lastname: Nilsson
authors.forename: Per
authors.initials: P
authors.lastname: Lundborg
mesh_terms: D000284:Administration, Oral; D000897:Anti-Ulcer Agents / Q000009:adverse effects / Q000493:pharmacokinetics* / Q000627:therapeutic use*; D019540:Area Under Curve; D001315:Australia; D002675:Child, Preschool; D004305:Dose-Response Relationship, Drug; D064098:Esomeprazole / Q000009:adverse effects / Q000493:pharmacokinetics* / Q000627:therapeutic use*; D005764:Gastroesophageal Reflux / Q000188:drug therapy*; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D007223:Infant; D007231:Infant, Newborn; D012720:Severity of Illness Index; D016037:Single-Blind Method; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D000897:Anti-Ulcer Agents; D064098:Esomeprazole