title: Comparison of the effects of ketoprofen on platelet function in the presence and absence of aspirin.
abstract: OBJECTIVE
  Although aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs) exert inhibitory effects on platelets in vitro and in vivo, there are insufficient data to substantiate the use of NSAIDs alone as antiplatelet drugs in patients already taking aspirin. We therefore sought to determine whether aspirin, added to NSAID therapy, further suppresses platelet function.
  
  
  METHODS
  We enrolled 25 healthy adult volunteers who were administered ketoprofen (extended-release capsules, 200 mg daily) for 1 week, followed by ketoprofen (200 mg daily) and aspirin (325 mg daily) or ketoprofen (200 mg daily) alone during the second week. Platelet aggregation, stimulated by epinephrine and arachidonic acid, and cyclooxygenase activity, measured by thromboxane B(2), were measured at baseline, on day 8, and on day 15.
  
  
  RESULTS
  On day 8, all subjects demonstrated abnormal platelet aggregation (>50% inhibition), which persisted at day 15 in both the aspirin and no aspirin groups. One week of ketoprofen treatment reduced thromboxane B(2) levels by 84% in the aspirin group and by 85% in the no aspirin group (P = 0.8), without any further inhibition measured on day 15.
  
  
  CONCLUSIONS
  Extended-release ketoprofen significantly inhibited platelet aggregation and thromboxane B(2) production in healthy volunteers. Addition of aspirin had no additional effect. Trials are warranted to determine whether these in vitro effects result in clinical antiplatelet activity in patients who require chronic treatment with NSAIDs, thereby avoiding the toxicity of NSAID/aspirin combination therapy.
authors.affiliation: Department of Medicine, Saint Barnabas Medical Center, 200 South Orange Avenue, Livingston, NJ 07039, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Van Solingen
authors.forename: E D
authors.initials: ED
authors.lastname: Rosenstein
authors.forename: G
authors.initials: G
authors.lastname: Mihailescu
authors.forename: M L
authors.initials: ML
authors.lastname: Drejka
authors.forename: A
authors.initials: A
authors.lastname: Kalia
authors.forename: A J
authors.initials: AJ
authors.lastname: Cohen
authors.forename: N
authors.initials: N
authors.lastname: Kramer
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D001241:Aspirin / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects*; D003692:Delayed-Action Preparations / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007660:Ketoprofen / Q000494:pharmacology*; D008297:Male; D010974:Platelet Aggregation / Q000187:drug effects*; D013929:Thromboxane B2 / Q000097:blood
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003692:Delayed-Action Preparations; D013929:Thromboxane B2; D007660:Ketoprofen; D001241:Aspirin