Effects of celecoxib, a novel cyclooxygenase-2 inhibitor, on platelet function in healthy adults: a randomized, controlled trial

J Clin Pharmacol. 2000 Feb;40(2):124-32. doi: 10.1177/00912700022008766.


Conventional nonsteroidal anti-inflammatory drugs (NSAIDs) nonspecifically inhibit cyclooxygenase-1 (COX-1), an enzyme critical to normal platelet function, and COX-2, which mediates inflammatory response mechanisms. Celecoxib, an antiarthritic agent that inhibits COX-2 but spares COX-1 at therapeutic doses, is expected to have minimal effects on platelet function. A double-blind, randomized, placebo-controlled study of 10 days' duration was conducted in 24 healthy adults to compare the effects on platelet function of a supratherapeutic dose of celecoxib (600 mg bid) with a standard dose of naproxen (500 mg bid), a conventional NSAID. Ex vivo platelet aggregation in response to standard agonists (collagen, arachidonate, or U46619 [a thromboxane A2 receptor agonist]), bleeding time, and serum thromboxane B2 (TxB2) level were measured. Unlike celecoxib or placebo, naproxen produced statistically significant reductions in platelet aggregation and serum TxB2 levels and increased bleeding time. The results indicate that even at supratherapeutic doses, celecoxib will not interfere with normal mechanisms of platelet aggregation and hemostasis, supporting the premise that celecoxib is COX-1 sparing relative to conventional NSAIDs.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid / pharmacology
  • Adolescent
  • Adult
  • Anti-Inflammatory Agents, Non-Steroidal / pharmacology*
  • Arachidonic Acid / pharmacology
  • Bleeding Time
  • Blood Platelets / drug effects*
  • Blood Platelets / physiology
  • Celecoxib
  • Collagen / pharmacology
  • Cyclooxygenase Inhibitors / pharmacology*
  • Double-Blind Method
  • Female
  • Humans
  • Male
  • Middle Aged
  • Platelet Aggregation / drug effects
  • Pyrazoles
  • Sulfonamides / adverse effects
  • Sulfonamides / pharmacokinetics
  • Sulfonamides / pharmacology*
  • Thromboxane B2 / blood


  • Anti-Inflammatory Agents, Non-Steroidal
  • Cyclooxygenase Inhibitors
  • Pyrazoles
  • Sulfonamides
  • Arachidonic Acid
  • Thromboxane B2
  • 15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid
  • Collagen
  • Celecoxib