Effect of nabumetone (BRL 14777), a new anti-inflammatory drug, on human platelet reactivity ex vivo: comparison with naproxen.

The effect of nabumetone (BRL 14777) on human platelet reactivity ex vivo was compared with that of naproxen at equitherapeutic doses in the same six subjects. Nabumetone had only a weak and equivocal effect on collagen-induced and second phase aggregation in response to adenosine diphosphate and adrenaline. After nabumetone, platelets fully aggregated in response to sodium arachidonate, though approximately twice as much was needed as on control occasions. Sodium arachidonate was unable to elicit a full aggregation response after naproxen. These results suggest that nabumetone may cause less interference with haemostasis than other non-steroidal anti-inflammatory drugs.