1-phenyl-3-pyrazolidone: an inhibitor of cyclo-oxygenase and lipoxygenase pathways in lung and platelets.

1-phenyl-3-pyrazolidone (phenidone) is a commercially available reagent used in the photographic industry. When tested as an inhibitor of arachidonic acid metabolsim in platelets and lungs it was found to be effective against both the cyclo-oxygenase and lipoxygenase pathways. It is suggested that this compound may be a useful pharmacological tool.