title: Gastroduodenal tolerance of 75 mg clopidogrel versus 325 mg aspirin in healthy volunteers. A gastroscopic study.
abstract: BACKGROUND
  Clopidogrel is a new antiplatelet agent that offers increased protection over aspirin in preventing vascular ischaemic events in patients with symptomatic atherosclerosis. In a large, randomized, international study of clopidogrel and aspirin (n = 19,185 patients) clopidogrel was associated with a lower incidence of gastrointestinal adverse events, including gastrointestinal haemorrhage and hospitalizations because of gastrointestinal haemorrhage. The aim of the study was to determine whether macroscopic differences in the gastric mucosa between aspirin- and clopidogrel-treated subjects could be detected by gastroscopy after short-term treatment.
  
  
  METHODS
  Thirty-six healthy volunteers were randomized in a double-blind, double-dummy, parallel design, to 75 mg/day of clopidogrel or 325 mg/day of aspirin for 8 days. Gastroscopy was performed at base line before administration of study drug and directly after treatment completion. Gastroduodenal effects were measured in accordance with a modified Lanza scale.
  
  
  RESULTS
  At base line no difference between the groups was detected (median Lanza score, 0.0 in both groups). At the end of treatment the aspirin group showed a median score of 7.5, and the clopidogrel group showed an unchanged median score of 0.0 (P < 0.001). In the aspirin group 13 individuals reported 19 adverse events versus 8 individuals and 13 adverse events for clopidogrel, with approximately half of the adverse events being gastrointestinal in each group. No serious adverse events were reported.
  
  
  CONCLUSIONS
  In contrast to aspirin, short-term treatment with clopidogrel does not induce macroscopic changes in the gastroduodenal mucosa. The study results show that in patients without gastroduodenal disease clopidogrel, but not aspirin, does not induce any gastroscopically evident erosions during short-term treatment.
authors.affiliation: Dept. of Diagnostic Radiology, and Sanofi Winthrop, Stockholm, Sweden.
authors.forename: F T
authors.initials: FT
authors.lastname: Fork
authors.forename: P
authors.initials: P
authors.lastname: Lafolie
authors.forename: E
authors.initials: E
authors.lastname: Tóth
authors.forename: F
authors.initials: F
authors.lastname: Lindgärde
mesh_terms: D000328:Adult; D001241:Aspirin / Q000008:administration & dosage / Q000009:adverse effects* / Q000627:therapeutic use; D000077144:Clopidogrel; D004311:Double-Blind Method; D004342:Drug Hypersensitivity / Q000209:etiology; D005753:Gastric Mucosa / Q000187:drug effects* / Q000473:pathology; D005756:Gastritis / Q000139:chemically induced; D005773:Gastroscopy; D006801:Humans; D007413:Intestinal Mucosa / Q000187:drug effects* / Q000473:pathology; D008297:Male; D010349:Patient Compliance; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage / Q000009:adverse effects* / Q000627:therapeutic use; D012307:Risk Factors; D013988:Ticlopidine / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use
chemical_list: D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine; D001241:Aspirin