Prevalence and management of drug interactions between nonsteroidal anti‐inflammatory drugs and antithrombotics in ambulatory care.

Concomitant use of nonsteroidal anti‐inflammatory drugs (NSAIDs) and antithrombotic agents is associated with increased risks of both bleeding and thromboembolism. In this prospective intervention study, community pharmacists screened for NSAID‐antithrombotic interactions and contacted the prescribing physician to discuss interaction management. We included 782 interactions; these were found in an older, polymedicated patient population (mean age: 68 y, median of 5 other drugs). Ibuprofen (in 43.0% of cases) and low‐dose aspirin (78.8%) were the most frequently involved NSAID and antithrombotic, respectively. Anticoagulants were involved in 16.1% of interaction cases. For 61% of cases, the interacting drugs were prescribed by the same physician. The pharmacist–physician discussion about how to manage the interaction mostly resulted in no change of pharmacotherapy (60.7%); the most frequent reason given by physicians was that the NSAID was for short‐term use only. In 39.3% of cases the discussion resulted in a pharmacotherapy change; replacing the NSAID by paracetamol was the most common change. [ABSTRACT FROM AUTHOR]