title: Morning versus evening dosing of lansoprazole 30 mg daily on twenty-four-hour intragastric acidity in healthy subjects.
abstract: BACKGROUND
  Morning dosing is usually recommended with proton pump inhibitors, but there are few data from 24-h intragastric acidity studies comparing times of dosing.
  
  
  METHODS
  A double-blind, placebo-controlled study was performed on the seventh day of dosing to compare the effects of lansoprazole 30 mg given either in the morning or evening on 24-h intragastric acidity in 32 healthy volunteers.
  
  
  RESULTS
  The median integrated 24-h intragastric acidity on the seventh day of morning dosing with lansoprazole 30 mg was decreased to 36% of the placebo value, compared with 42% for evening dosing. For each daytime meal-related interval, morning dosing was significantly more effective for controlling acidity, but there was no significant difference between the regimens during the night interval (23.00-08.00 h).
  
  
  CONCLUSIONS
  These data favour morning dosing of lansoprazole 30 mg for routine use, but patients with mainly nocturnal symptoms may be best treated by evening dosing.
authors.affiliation: University Department of Medicine, Royal Free Hospital School of Medicine, London, UK.
authors.forename: A G
authors.initials: AG
authors.lastname: Fraser
authors.forename: A M
authors.initials: AM
authors.lastname: Sawyerr
authors.forename: M
authors.initials: M
authors.lastname: Hudson
authors.forename: M S
authors.initials: MS
authors.lastname: Smith
authors.forename: R E
authors.initials: RE
authors.lastname: Pounder
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D002940:Circadian Rhythm; D004311:Double-Blind Method; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005744:Gastric Acid / Q000378:metabolism*; D005745:Gastric Acidity Determination; D005753:Gastric Mucosa / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D064747:Lansoprazole; D008297:Male; D009853:Omeprazole / Q000031:analogs & derivatives* / Q000494:pharmacology; D054328:Proton Pump Inhibitors
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D004791:Enzyme Inhibitors; D054328:Proton Pump Inhibitors; D064747:Lansoprazole; D009853:Omeprazole