[Influence of nonsteroidal anti-inflammatory preparations on the in vitro and in vivo effects of sodium arachidonate].

It has been demonstrated on isolated guinea-pig ileum and rats that nonsteroid antiinflammatory drugs (acetylsalicylic acid, ibuprofen, diclofenac sodium, butadione, and indomethacin) antagonized spasmogenic and inflammatory effects of sodium arachidonate, but not of other mediators of inflammation such as histamine, serotonin, bradykinin and PGE2. "Antiarachidonic" potency of nonsteroid antiinflammatory drugs correlated well with their antiinflammatory activity and their ability to inhibit endogenous PG biosynthesis. This method determining the antagonism to arachidonic acid effects in simple in vitro and in vivo models can be useful for screening nonsteroid antiinflammatory drug potential.