Platelet Inhibition by Aspirin, Acetaminophen and NSAID

This study has been completed.
Information provided by:
Kantonsspital Graubünden Identifier:
First received: September 26, 2007
Last updated: September 27, 2007
Last verified: September 2007
Nonsteroidal antiinflammatory drugs such as diclofenac or naproxen may interfere with the inhibition of platelet aggregation by aspirin, because they all interact with the platelet cyclooxygenase.This may be of great clinical importance because of an increased cardiovascular event rate (myocardial infarction, stroke). The present randomized, controlled study analyses in vitro platelet aggregation under a combined treatment of healthy volunteers with aspirin and either acetaminophen, diclofenac, naproxen, or placebo.

Condition Intervention
Drug: Acetylsalicylic acid, acetaminophen, diclofenac, naproxen, placebo

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Single Blind (Subject)
Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by Kantonsspital Graubünden:

Primary Outcome Measures:
  • platelet aggregation [ Time Frame: 5 days ]

Enrollment: 11
Study Start Date: August 2006
Study Completion Date: August 2007
Arms Assigned Interventions
Experimental: 1, 2, 3, 4
  1. acetylsalicylic acid 100 mg/po,acetaminophen 3x1g/po
  2. acetylsalicylic acid 100 mg/po,diclofenac 3x50mg/po
  3. acetylsalicylic acid 100 mg/po,naproxen 3x250mg/po
  4. acetylsalicylic acid 100 mg/po,placebo 3x1/po
Drug: Acetylsalicylic acid, acetaminophen, diclofenac, naproxen, placebo
  1. Acetylsalicylic acid 100mg/po and acetaminophen 3x1g/po for 4 days
  2. Acetylsalicylic acid 100mg/po and diclofenac 3x50mg/po for 4 days
  3. Acetylsalicylic acid 100mg/po and naproxen 3x250mg/po for 4 days
  4. Acetylsalicylic acid 100mg/po and placebo 3x1/po for 4 days

Detailed Description:
An in vivo study on healthy volunteers with combinations of well established drugs

Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy volunteers

Exclusion Criteria:

  • Administration of drugs affecting platelets
  • History of bleeding
  • Gastrointestinal disorders
  • Hypersensitivity to aspirin and/or NSAID
  • Pregnancy and breast feeding
  Contacts and Locations
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Please refer to this study by its identifier: NCT00536068

Kantonsspital Graubünden, Department of Internal Medicine
Chur, Switzerland, CH 7000
Sponsors and Collaborators
Kantonsspital Graubünden
Principal Investigator: Walter H Reinhart, MD Professor Department of Internal Medicine, Kantonsspital Graubunden CH7000 Chur Switzerland
  More Information

No publications provided Identifier: NCT00536068     History of Changes
Other Study ID Numbers: KGWR0206
Study First Received: September 26, 2007
Last Updated: September 27, 2007
Health Authority: Switzerland: Swissmedic

Keywords provided by Kantonsspital Graubünden:

Additional relevant MeSH terms:
Analgesics, Non-Narcotic
Anti-Inflammatory Agents
Anti-Inflammatory Agents, Non-Steroidal
Antirheumatic Agents
Cardiovascular Agents
Central Nervous System Agents
Cyclooxygenase Inhibitors
Enzyme Inhibitors
Fibrin Modulating Agents
Fibrinolytic Agents
Gout Suppressants
Hematologic Agents
Molecular Mechanisms of Pharmacological Action
Peripheral Nervous System Agents
Pharmacologic Actions
Physiological Effects of Drugs
Platelet Aggregation Inhibitors
Sensory System Agents
Therapeutic Uses processed this record on November 30, 2015