title: Risk of gastrointestinal haemorrhage with long term use of aspirin: meta-analysis.
abstract: OBJECTIVE
  To assess the incidence of gastrointestinal haemorrhage associated with long term aspirin therapy and to determine the effect of dose reduction and formulation on the incidence of such haemorrhage.
  
  
  METHODS
  Meta-analysis of 24 randomised controlled trials (almost 66 000 participants).
  
  
  METHODS
  Aspirin compared with placebo or no treatment, for a minimum of one year.
  
  
  METHODS
  Incidence of gastrointestinal haemorrhage.
  
  
  RESULTS
  Gastrointestinal haemorrhage occurred in 2.47% of patients taking aspirin compared with 1.42% taking placebo (odds ratio 1.68; 95% confidence interval 1.51 to 1.88); the number needed to harm was 106 (82 to 140) based on an average of 28 months' therapy. At doses below 163 mg/day, gastrointestinal haemorrhage occurred in 2.30% of patients taking aspirin compared with 1.45% taking placebo (1.59; 1.40 to 1.81). Meta-regression showed no relation between gastrointestinal haemorrhage and dose. For modified release formulations of aspirin the odds ratio was 1.93 (1.15 to 3.23).
  
  
  CONCLUSIONS
  Long term therapy with aspirin is associated with a significant increase in the incidence of gastrointestinal haemorrhage. No evidence exists that reducing the dose or using modified release formulations would reduce the incidence of gastrointestinal haemorrhage.
authors.affiliation: Department of Clinical Pharmacology, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE.
authors.forename: S
authors.initials: S
authors.lastname: Derry
authors.forename: Y K
authors.initials: YK
authors.lastname: Loke
mesh_terms: D001241:Aspirin / Q000008:administration & dosage / Q000009:adverse effects*; D016861:Cyclooxygenase Inhibitors / Q000009:adverse effects*; D004305:Dose-Response Relationship, Drug; D005343:Fibrinolytic Agents / Q000008:administration & dosage / Q000009:adverse effects*; D006471:Gastrointestinal Hemorrhage / Q000139:chemically induced*; D006801:Humans; D008134:Long-Term Care; D016017:Odds Ratio; D016032:Randomized Controlled Trials as Topic; D012307:Risk Factors
chemical_list: D016861:Cyclooxygenase Inhibitors; D005343:Fibrinolytic Agents; D001241:Aspirin